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Keith Clark
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Hi Kurtie,

Thanks for the link - it's full of information, and some may find it useful.

Keith

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Keith Clark
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Hi Kurtie,

Well, no questions are stupid - but I'm also not very gifted electronically, so I'm not the best person to answer it. Perhaps Slider or another technically minded person here would be able to answer your question.

When I did experiments with germanium diodes, I found that I had to plug it into an amplifier (mixer) to even be able to hear or use it. The volume was naturally too low.

Either way, good luck.

Keith

 

Slider2732
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Crystal circuits I too am not that familiar with unfortunately. I have always been put off by the need to have a good Ground connection, the wire that should go to perhaps metal household plumbing or metal heating system of the house. The aerial typically needs to be quite some length too, to pick up stations...2 metres and more. Apparently a long wire can run from a handheld crystal circuit and touch a concrete floor as the Ground connection, but with all being able to be replaced by 1x AA battery for a conventional receiver, it just all passed me by.

They do work, but do need a correct earphone. The ones for cassette recorders etc need power to work, however there's no battery in a crystal circuit.

Such work is very important in my opinion, especially within ITC. Stray pick ups of strong signals might give false results in sweep radio circuits etc, if someone were to use a germanium diode in place of a regular one. On altering a Casio home keyboard earlier this year to get some better sounds out of it, I inadvertantly created a radio circuit and picked up a local channel !  Quite funny, but showed that radio circuits need not be designed and can be the consequence of some components interacting with others.


Just had a look at this page: http://www.crystalradio.net/howitworks/index.shtml
It has the fundamentals of crystal radio operation and while quite basic, teaches the basics. Quite often ITC seems like High school physics lessons. Only later do I think such things might be useful and wish i'd paid a little more attention at the time lol
 

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Keith Clark
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Hi Kurtie,

I am about to start live radio experiment sessions with audio/video. Perhaps you might be interested in participating?

For more info, visit the following page at this other site:

http://www.bestpsychicnetwork.info/group/itcbridgeradiocollaborationproject/forum/topics/introductory-post-start-here

Keith

joecioppi
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kurtie,

The circuit you have posted needs a resistor from the diode to the base of the coil for the current to flow from the top of the coil through the diode and back to the coil .
The input jack of the recorder may not have a return to ground and the resister is necessary. The crystal earphone shown also needs the resistor because the nature of a crystal earphone is capacitive and will not present a proper load to the diode.

The tuning capacitor shown  will tune radio stations that can block evp in the static noise. Leave it out or tune to quiet space between stations.

joecioppi



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