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Germanium Diodes  Rating:  Rating
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 Posted: Dec 18th, 2009 03:14 PM
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joecioppi
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mikesndbs wrote: Hi Joe

 

Been thinking about this today and have done some hook ups to check.

If I remove the choke from the diagram and instead use the 100K resistor in its place so as to give me a circuit, I hear mostly a 50hz hum from the mains here in the UK.

Could I filter this using passive components, but still keep this 'sniffer' sensitive to all other fqs?

 

Thanks

Mike


Mike,

Look at this circuitry for a way to boost vlf signals and reduce the power hum. This design is essentially an untuned radio receiver with vlf bandwidth. The filter cuts the hum.

http://www.auroralchorus.com/bbb4rx3.htm

Joe

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 Posted: Jun 15th, 2010 04:09 PM
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clockdryve
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More that just INTRESTING Mr. Clark.
This has that audio BUZZ just like that radio receiver that uses 13 frequencies (can't remember the name). The difference between the original germanium diode and your switching diode (zenear) is that the germanium will block energy one way, and allow it to travel in one direction only (DC) and a "zener" Diode like yours not only BLOCKS...but allows it to travel the other way also IF the current gets high enough to "trip" over the blockage. So it will travel in an AC fashion. Do you remember if you were near a fluorescent light source? That would very easily explain the "buzzing" noise from the 60hz electrical field (US) - 50hz Europe. Do you still have the circuit? Or did you just put it together OUTSIDE the box and grounded to this box as shown in the picture(metal bottom maybe...like a large capacitance devise). Did you get any different results while holding it?? Was this BUZZING a very common effect or only sometimes it would be noticeable? Was this buzzing the effect of an external "amplification" devise or circuit? Do you still have the box laying around where you can "try again". I realize this is an old post...but a certain Google search brought up this page.

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 Posted: Jun 15th, 2010 04:19 PM
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clockdryve
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joecioppi wrote:

mikesndbs wrote: Hi Joe

 

Been thinking about this today and have done some hook ups to check.

If I remove the choke from the diagram and instead use the 100K resistor in its place so as to give me a circuit, I hear mostly a 50hz hum from the mains here in the UK.

Could I filter this using passive components, but still keep this 'sniffer' sensitive to all other fqs?

 

Thanks

Mike


Mike,

Look at this circuitry for a way to boost vlf signals and reduce the power hum. This design is essentially an untuned radio receiver with vlf bandwidth. The filter cuts the hum.

http://www.auroralchorus.com/bbb4rx3.htm

Joe

I have one of these receivers. I have the one (in clockwise direction) 4th "black" receiver on top right side...this one is "SILVER" (aluminum) in color. His picture just had a shadow in it. With these receivers you need to be MILES away from electrical interference. Or the hum and buzz will tear your head off :) You can actually "rub" the antenna on the ground and HEAR the noise in the headphones. I think these are actually an "amplification" circuit built without a proper input (antenna connected instead) *something like that.

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 Posted: Jan 27th, 2011 05:29 PM
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David Payne
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I tried to build one of these according to joes diagram.

Not sure if i did something wrong or just simply not getting results.

The only sounds the receiver produces is a lot of white noise, and the occasional hum you get when a speaker feedback's. Im not hearing any noises or voices close to what others are getting.

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 Posted: Jan 27th, 2011 09:35 PM
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David Payne
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Well I tried to make the circuit again, and im still not sure if its right.  Im not getting anything other than white noise and a slight hum.  I rigged my up using the exact parts and circuit as in joes diagram.

Anyone provide help?

Thanks

Attachment: raudive.mp3 (Downloaded 472 times)

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 Posted: Jan 29th, 2011 02:44 PM
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David Payne
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Anyone?

Could really use some help. Perhaps people are giving up on raudive?

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 Posted: Jan 29th, 2011 02:58 PM
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clockdryve
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No, I still use the Raudive Receiver. I just received my 3rd Receiver beginning of this week. Purchased on eBay. This last one has a microphone built in and a momentary "push button" that I asked the builder to include to allow this mic to engage (to ask questions) then release so the raudive is inline for spirit answers through the circuit. Mine has 2 separate raudive circuits built in. Been to cold to use at locations in my home town. But I did get a few (very low audio) EVP's from inside my local library. Male voice says "I"m American" and another voice said "can you hear me". The first one..."I'm American" seemed Odd because the Raudive was "built" in Europe :) I can upload later. On cell phone right now and not on file. I have 4 or 5 more from the Raudives...recorded earlier during last summer. I haven't really used then much though cause I had back surgery During September and was stressed when I did go out. I use the DR60 or Sony B7 most of the time. When I use my raudive I either connect to B7 or Sony ICD-B300.

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 Posted: Jan 30th, 2011 05:13 PM
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clockdryve
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K, I'm a little late at uploading these 2 files. You WILL need headphones and a good ear as they are soooo near silent. Raudive's (at least mine) will nearly always be very weak...I used the Raudive Receiver I purchased on eBay with the push button microphone attachment. You will not hear my voice in any of these. Was only present in the one that said "can you hear me" anyway...but my voice was very loud and unpleasant. I'm only going to upload my most recent Raudive's tonight and will include the other "very few" in a day or two.

 

The one included in the below attachment "i'm american" was recorded out in my jeep on the 26th of January 2011 as I was parked outside my local library. I turned on my recorder for a few minutes after I parked...just after getting the Raudive Receiver out of the package coming from delivery in the mail that day. This recording was a "spuratic" as I didn't ask any questions...I was mainly trying out the microphone function. I didn't record in the Library this day anyway.

Attachment: i'm_american-evp.mp3 (Downloaded 495 times)

Last edited on Jan 30th, 2011 05:25 PM by clockdryve

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 Posted: Jan 30th, 2011 05:23 PM
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clockdryve
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Here's my next recording from January 27th 2011 from inside the Library.

I tried about 3 times with the Raudive and a couple times with the DR60 and once with the Sony ICD-B16. Got nothing with the DR60 (that was odd) and nothing on the B16 (common for me). This was recorded on the Sony ICD-B300, as was the "i'm american" (my 3rd most popular recorder).  *(DR60 is #1 and Sony ICD-B7 is #2).

I hear "can you hear me" on this recording....this was an answer (sort of) to what I was saying.... I repeated the phrase "test-1-2-3....test-1-2-3" 2 times, and the male voice said (after I released the microphone button) *switching in the "electrical receiver only" --Can You Hear Me--. When I push in the button this is the only time this receiver will hear a VOICE or Vibration"....all other times it is DEAF to the sounds WE hear....but picks up from the HIDDEN. You might need to LOOP or listen to this several times before you can hear it. I will upload a picture of the Raudive receiver in a day or two when I have time to take one.

Attachment: AMPED-can_you_hear_me-evp.wav (Downloaded 459 times)

Last edited on Jan 30th, 2011 05:28 PM by clockdryve

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 Posted: Jan 30th, 2011 05:29 PM
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David Payne
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Clock those are real nice.

But as I said, i didnt buy one, i made one according to Joes Schematic. And its not working.

So im trying to get help on why. So i cant really contribute till someone with some knowledge of building them can help me, but it seems they have abandoned this thread.

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 Posted: Jan 31st, 2011 04:42 AM
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clockdryve
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Here's another drawing of the same circuit Joe showed you. Only thing I can think of if you built it and having a problem is maybe the diode is in backwards....
But Joe says that it's okay in this circuit and I would believe him because of his past occupation :)

But maybe can just flip it around just to "see what happens" ya never know, you will either pull from the ground or arial -- one may be better.  Also...did you use the proper diode called for in the circuit? Another thing...It is HARD to tell if you captured anything because it's gonna be very quite. You need to have the recorder volume UP very high when you transfer to the computer (until you can hear the static level at least). And you will need to listen real close. It will be so easy to pass over one of these voices using the Raudive Receiver........trust me on those words for sure.

 

The attachment drawing came out of the 1995 October issue of Popular Electronics

was available for download (4 pages) using Google Web Browser "Google Books". The 4 pages didn't really have anything special in the article...just the circuit only.

 

Attached Image (viewed 5277 times):

Raudive Diode Receiver Circuit.jpg

Last edited on Jan 31st, 2011 04:44 AM by clockdryve

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 Posted: Jan 31st, 2011 04:57 AM
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clockdryve
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One other thing...I have used an Olympus WS-100 on the Raudive and it doesn't "hear" anything...my Sony B7 and B300 (set to lowest quality work best)...I don't know what you are using but TRY the lower BIT rate (LP) but keep the microphone setting on highest. Good Luck

Last edited on Jan 31st, 2011 04:58 AM by clockdryve

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 Posted: Jan 31st, 2011 05:20 AM
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clockdryve
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If you want to try a different circuit...try this "less know" design from the attachment. It uses a different resistor and removes the coil and adds a capacitor...Be SURE you insulate the location where the "stiff" wire (straightened paper clip is fine) comes out of the metal enclosure so it doesn't TOUCH if you decide to use the metal. You can build this without the metal enclosure...but if you want it as original then it is to be included in BOTH designs.

Attached Image (viewed 2861 times):

Raudive Diode receiver 2.jpg

Last edited on Jan 31st, 2011 05:26 AM by clockdryve

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 Posted: Feb 8th, 2011 12:16 PM
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mikesndbs
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clockdryve wrote: If you want to try a different circuit...try this "less know" design from the attachment. It uses a different resistor and removes the coil and adds a capacitor...Be SURE you insulate the location where the "stiff" wire (straightened paper clip is fine) comes out of the metal enclosure so it doesn't TOUCH if you decide to use the metal. You can build this without the metal enclosure...but if you want it as original then it is to be included in BOTH designs.

Have you tried this one?

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 Posted: Feb 14th, 2011 05:30 PM
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clockdryve
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No, havent tried it (never built it anyway).

My Raudive Receiver I purchased from eBay has that circuit though.

The Receiver I use has BOTH circuits, so I should say that I HAVE used it.

What  I have is included on each side (seperated), one circuit on left...and one circuit

on right channel. And I use it on Mono equipment, so with the mono/stereo adapter

this will combine the signal onto one channel. If I used a stereo recorder then I could

actually seperate the signals and find which is working BETTER at the time...

Although I haven't done that yet. It's been to cold here in Iowa to search for EVP's

the way I prefer---but it has been getting warmer :)

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 Posted: Feb 14th, 2011 05:56 PM
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clockdryve
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The "F0-215" Germanium Diode is considered the "Holy Grail"
of Crystal Diodes... Most "sensitive" (better than the Schottky Diode), so you might want to try that one also. I would recommend using a metal box as a shield to unwanted reception...cell phones and other electrical interferance items. The shield is that "dotted lines" in the 2nd circuit I showed you (make a fully enclosed box), and no short circuits (remember to not allow the antenna to short against this shield) *The antenna can be a piece of STIFF wire with rubber insulation around it...doesn't need to be bare to receive. That metal shield also has the ground symbol attached to it also. It wouldn't hurt to have an aligator clip attached to a "post" attached to this shield...and ground it to "ground" for ultimate protection from interferance (like electrical hum possibly) *keep the ground wire short if possible.

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 Posted: Feb 20th, 2011 04:07 AM
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mikesndbs
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Hi clockdryve

I just ordered one of those ebay detectors, be interesting to compare notes?

Mike

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 Posted: Feb 20th, 2011 07:07 AM
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clockdryve
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Cool Deal :) What recorder are you using it on? Which one you get from eBay. The microphone/switch version...Non-Mic version or Microphone version?? Be sure you turn your recorder FULL up on playback into pc...the audio will still not be very loud. There is no interferance available so white noise is only thing you will hear until you run into an EVP. When you find the EVP it will often times be very faint. Just amplify it a few times lightly. I have a few more EVP I need to upload. With and without the Raudive Receiver. Good luck with your tests.

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 Posted: Feb 20th, 2011 12:07 PM
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mikesndbs
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Hi, I intend to run its output into a preamp and then into a small audio amp, all battery powered so its all portable.

The one I got is this:

EVP Raudive Diode Receiver For Paranormal Ghost Hunting.

 

Cheers

 

Mike

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 Posted: Feb 20th, 2011 12:48 PM
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clockdryve
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K, well there are actually 3 made by that guy on eBay (tvkev). He has the one that has 2 antennas (2 raudive circuits inside), then the one with 2 antennas (same inside) and a plugin microphone included...then the last model has the 2 antennas (same inside), along with the push button switch for the external microphone that is included. The switch allows you to temporarily connect the microphone so you can ask the question...then let go of the button so that anything AFTER your recorded "test" question will ONLY be coming from the Raudive without human voice or external "interference" being picked up...and this will be your ghost voice ONLY. *If you need a more advanced Receiver (in case you didn't get the pushbutton/microphone) version...just email him (email address shown in his listing) quickly and he COULD upgrade you through extra paypal payment. He is well trusted and dependable...I have purchased 3 from him (only 1 through eBay...1st model without microphone). *I have 2 of them without microphones (used a Y connector and connected my own microphone) And he listened to my request to make them with microphones :) I have emailed him and sent him some of my results...with always a return email. But if you got the microphone "without" the pushbutton you can just use an external switch (modification) to allow the mic to have a pushbutton...(More convenient to purchase that way though) *and the same even IF you didn't get the one with the microphone at all. This new model he has out now was the results of a request by me again...for a "pushbutton" model to add even MORE possible positive results for us :) Though the adding of a microphone button would have eventually turned up anyway ;) You have an excellent idea in your hook up for a LIVE evp capture attempt. Might I also suggest a TAP to include a recorder connection as a 2nd chance of hearing the evp (they can be easily missed), and also a connection for headphone connections (or Y connector for both)...because these can be "very-very" low audio and easily covered in the "hiss" from the white noise you will ALSO capture....Happy SAFE Hunting

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 Posted: Feb 20th, 2011 12:51 PM
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clockdryve
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Mmm, I don't have any financial gain in this guy on eBay...he just happens to be someone that has something we need. And so happens to be the one that designs them so he can modify to our special requests. Lucky Us ;)

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 Posted: Feb 20th, 2011 04:26 PM
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clockdryve
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Here is the link to the eBay site with the Raudive Diode Receiver with the push button microphone option. This is actually the picture he sent me of MY receiver after he modified to my specifications.....

Now they are an option to other buyers at a higher cost than without the switch of course....


http://cgi.ebay.com/EVP-Raudive-Diode-Receiver-Microphone-Switch-Ghost-Hunt-/220732655484?pt=UK_Gadgets&hash=item3364b1077c#ht_2065wt_905

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 Posted: Feb 20th, 2011 07:16 PM
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clockdryve
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Here is what I have received from this Microphone/Switch Variety Raudive Diode Receiver....I haven't been out much lately because of the cold weather, but the last 4 days were nice (but I only used one time). This one is HARD to hear of course. Use the headphones-and still might not help. The capture was recorded on my Sony ICD-B16 and is the FIRST capture I ever got on this recorder....

 

My name is Jim (mentioned in recording)

Attachment: DENOISED-high-lowpass-amped-help_jim-evp.wav (Downloaded 589 times)

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 Posted: Feb 27th, 2011 12:56 PM
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mikesndbs
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Got my unit, not massively impressed that its all sealed up so you can't check things! Well I have and improved one of the connections.
Tested and shows its open to HF frequencies on one side, the side with the inductor anyway thats the ring of the 3.5mm plug.
The other side is indeed open and there is a scrolling sound probably generated in the home.

I intend to take it out into the country and try soon.

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 Posted: Feb 27th, 2011 02:18 PM
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clockdryve
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What do you mean by using the phrase "open"?? In electronics the word open means that the connection has been broken...then you also say that you "improved" upon one of the connections...does this mean that an area was poorlyy soldered?? My last question (2 really)...does his circuit design include a metal shield around his choice of electronics...and what is used in the design?? I have never "broke or cut" mine open.

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 Posted: Feb 28th, 2011 02:51 AM
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mikesndbs
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Hi

some clarification :-)

In this case open was used to indicate 'receptive to'

Yes, I was annoyed to find a earth loop buzz on the one channel so when I opened it I was not surprised to discover a bad connection.

There is a resistor with one of its legs sticking through the card cover that is meant to touch the foil wrapper.

He had not cleaned the leg and it still had gum on it, so I cleaned it and used a clip to attach it to the foil.

Yes, he has a foil wrapper around the circuits with a card insulator..

 

Anyway I tried it last night using just a simple cassette recorder.

I found it to be quite sensitive on its own.

The attached file (compressed and cut due to size limits here) will let you hear the results.

All I can hear is some bumps that might be due to tape impurities.

With no audio pick up, they are surprising all the same.

I don't hear any evp type voices but then I am bad at that.

Let me know?

Attachment: R.Diode27.2.11.mp3 (Downloaded 424 times)

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 Posted: Apr 8th, 2011 09:13 PM
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MrZeta
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Howdi,

Not alot of time but I wanted to say hi...

Good info on the diodes...

I have been dealing with trying to quantify all this - I still am in disbelief and have my issues - however and I havnt got back into working with this almost 3 years now - why - cause the last few recordings I got I couldnt explain - kind of a shock an awe deal...

I have discovered some things and I really hate to devulge because I have felt so srong that the world really isnt ready for this...

I am not here to judge - it is like a thing inside me that prevents me or makes me feel that way - could be bad entities succeeding - who knows...

However - I am going to shed some light to help you...

1) Dont use opamps (anymore) (note to to the prev post on peamps etc...

When I get a religious station popping in with no tuning circuit for a few seconds; that worries me LOL...I had to start from square one..out goes the pretty little opamp...

So - go discrete - diodes, pn junctions, there seems to be some collectiveness here...you see how slow this is all taking place?

I am looking at more front end discrete sophistication - but I got personal problems, stuff to do, things that seem to hinder my work - thats why I am releasing what I know, or have been supposedly told by 'outside' sources...believe me this is hard for me to deal with...but I have improved since the last recording and want to get back into this...

As for the ebay stuff and Raudive design (with antenna!) - one experiment was to use the crystal radio - wiggling the diode was like changing stations quickly...then theres 1500AM land...

Save your money - $70+/- for this equipment? Wow...I would investigate the circuit but I wouldnt trust it...why...its a crystal radio...you dont want radio waves.

Example (untested by me yet) was a 600 or 10K ohm resistor input across mic input to recorded (IE no mic - just the resistor!) - results were obtained.

We are looking at electromagnetic induction here (one means of many)...ie just electrical OR magnetic, or both...there is a list...

And then there is the new problem of our own minds putting these messages onto recorders...I have solved that problem but not tried yet...I have all the means necessary to continue...

Work with discrete - all discrete - no opamps - and no EBAY stuff ! Dont buy what you cant see !

Supposedly, the entities are using many means to try and communicate (elcetronicaly); I seem to have access to many - I just need to design and build; but I have problems to work out...

The most reliable results: simple handheld 'TAPE' recorder...now with that having microcircuits...you see the need for work...

Good Luck!

Ok a hint has arrived in my head...a resistor changes to heat - its voltage can vary - into a voltage to frequency => audio into recorder...the need for transducers...no mic or...I dont know...

Wish me luck too ! I added my homepage to my profile if it isnt there already...

(ps Sorry about the typos - it is the info that counts! Besides most of our recordings are bits and pieces too...but there is info in the noise and we know that)

MrZeta

 

 

 

 

 

 

 

 

 

 

 

 

 

Last edited on Apr 8th, 2011 09:18 PM by MrZeta

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 Posted: Apr 10th, 2011 07:45 PM
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clockdryve
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I have actually used a Stereo/Mono 1/8" adapter on the Input to recorder microphone with NOTHING attached. What this does is remove the recorders internal microphone from the circuit...and replaces it with NOTHING....so by rights, you shouldn't hear a thing. I tried it one time and heard a voice...and have plans on doing it more in the future. Try it :) Seems more and more possible that they are not (or don't need) to use the microphone....maybe they are actually getting in by the window of the glass on the recorders internal "diodes". And it has been proven that these signal receiving diodes CAN detect and transfer light to energy.

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 Posted: Apr 11th, 2011 10:23 AM
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Bravo Paranormal
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Hi all I'm new to this forum but not this topic. I have been experimenting with different models of raudive receivers. This past weekend I made a basic set up and fit all circuitry inside the stereo adapter. I wasn't expecting to get anything, but to my surprise after making a one minute recording i received an evp that stated "This is A test". This kinda has been messing with me all day.

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 Posted: Apr 11th, 2011 10:38 AM
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clockdryve
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Hehe, welcome to the forum.
Lucky you...found a willing evp "test partner" :)

I've ran through "tests" and they say things like "I can't believe this...can you hear me?" and "it works Jim". Can't say it won't keep you up at nights at first though. LOL

I too use the Raudive Receivers. Have been trying out the IR Diode Receivers here lately though.

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 Posted: Apr 11th, 2011 02:26 PM
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mikesndbs
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clockdryve wrote: Hehe, welcome to the forum.
Lucky you...found a willing evp "test partner" :)

I've ran through "tests" and they say things like "I can't believe this...can you hear me?" and "it works Jim". Can't say it won't keep you up at nights at first though. LOL

I too use the Raudive Receivers. Have been trying out the IR Diode Receivers here lately though.


Hey Jim :-)

How you been getting on with the IR diodes?

 

Mike

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 Posted: Nov 2nd, 2011 02:47 PM
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Old-Frank
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...two years later... I make a little amp I call AM boost for the AM tuners in the boxes, so got the idea to drive Raudive circuit with the boost circuit. Still working on it.

 

F-S

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 Posted: Nov 2nd, 2011 02:55 PM
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clockdryve
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Wow Mike....I can't believe I missed this post from way back in April :blushing:

Sorry about that. I have not been out much at all this summer. Only a few EVP recorded. How you been? I think of you quite often I do.

You ever try the normal Digital Recorder.... (by it's self) much any lately??




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 Posted: Nov 17th, 2012 10:32 AM
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ratpack63
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I got most of the parts to build it. But two things not sure about. One can l use a 14 gauge copper wire for a antenna and dose this look like the right 500UH RF CHOKE

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 Posted: Nov 17th, 2012 01:05 PM
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joecioppi
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The antenna wire gauge is heavy to give stiffness...the actual gauge isn't important.

The choke you have is very efficient and will work very well blocking radio frequencies. However, a Raudive detector is limited to detection of higher levels of noise and is not selective to random noise. It may be swamped by strong broadcast signals in your area. Goodluck...try to stay away from populated areas.

Joe

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 Posted: Nov 17th, 2012 03:06 PM
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ratpack63
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Thanks for your help, I am put raudive detector circuit inside a metal box. What do you use for a antenna.

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 Posted: Nov 17th, 2012 04:48 PM
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joecioppi
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since the circuit is broadband, the antenna length isn't critical....you can use anything from a long insulated wire to a stiff piece of wire..just don't touch the grounded metal box

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 Posted: Nov 17th, 2012 05:56 PM
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ratpack63
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So you have to ground the box. Can you tell me how to do it. Just learning how to make this stuff for ghost hunting.

Thanks
Miles

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 Posted: Nov 18th, 2012 03:30 AM
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Jan
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Has anyone tried using much newer Schottky diodes rather than germanium? They have a slightly lower forward threshold voltage and insignificant reverse leakage so should be more sensitive. They are what the low-signal crystal set boys are using now I believe.

1N5711, 1N5712 are typical Schottky types and not much more expensive that germanium diodes.

But can someone please explain what these circuits are supposed to do? As far as I can tell, they are just very wide-band RF detectors, any audio component rectified and passed to the audio input of the recording device.

I can see that there is likely to be massive amounts of mains hum induced into the recorder, masking whatever is supposed to be recorded. Apart from adding a high-pass filter, I guess the easiest solution is to record at least a few hundred yards from anywhere with electricity - middle of a field or forest...

Thanks,

Jan

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 Posted: Mar 23rd, 2013 01:54 PM
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Jan
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No replies in three months?

So guys, have you been experimenting and what were the results?

Jan

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