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step sweep--  Rate Topic 
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 Posted: Apr 7th, 2013 11:37 PM
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Old-Frank
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Up down staircase generator, has the same effect as a hacked radio--complete with chufing sound.

Frank

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 Posted: Apr 7th, 2013 11:48 PM
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Old-Frank
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Listen at 21 seconds, I had to trim the vid size cuz of size limit here.

Frank

Attachment: VIDEO0784_NEW.mp4 (Downloaded 772 times)

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 Posted: Apr 7th, 2013 11:53 PM
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Old-Frank
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Wait there is an erro on the schematic

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 Posted: Apr 8th, 2013 12:01 AM
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Old-Frank
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Quickly re-drawn

Frank

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 Posted: Apr 8th, 2013 01:54 AM
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Frank Douglas
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Pretty clearly says "Frank"



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 Posted: Jan 23rd, 2014 12:26 PM
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Old-Frank
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Now I have step sweep micro TV..Seems to work. Gettign the pulse generator to run on 27V a little tricky. Ya can't bias the op for 1/2 power supply.

Frank

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 Posted: Jan 23rd, 2014 12:28 PM
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Old-Frank
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I post videos of boxes and TV sweep on Facebook. It's more difficult to put video here.
Frank

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 Posted: Jun 4th, 2014 02:58 PM
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sparks
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The schematic as shown needs 2 chips.
One for the top half (LM3900) and one for the lower half (LM358).

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 Posted: Nov 2nd, 2014 05:55 PM
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Dr. Heinz Doofenshmirtz
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This is awesome.....
Made me think of a different way to produce a stair step.....
basically a hex inverter for a clock, triggering a decade counter.
Out of each output of the decade counter you would put a voltage divider....preferably on a potentiometer.....that way you can adjust each one independently, and get a different voltage per output......

Unfortunately with all the outputs tied together..... seems the voltage flows backwards through all of the voltage dividers...it causes an extremely low output voltage.... I'm thinking diodes....

If you tie all the cathodes of the voltage dividers together and put a cap between them and ground, also between the output voltage and ground, you can give your wave some sexy curves.... This pretty much destroys any resemblance of a stair case wave......but if gives you a cool way to modify your sweep waves.....

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 Posted: Nov 2nd, 2014 05:56 PM
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Dr. Heinz Doofenshmirtz
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you can also get close on a linear up sweep

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