[sdiy] percusion synth design and problems.

[Michael Schulze]

So is this how the GI's in WWII used to receive the Tokyo Rose broadcast
with a rusty razor blade and a paperclip?

> From: Grant Richter <grichter at asapnet.net>
> Date: Mon, 14 Apr 2003 09:14:28 -0500
> To: Jay Schwichtenberg <jays at aracnet.com>, <synth-diy at dropmix.xs4all.nl>
> Subject: Re: [sdiy] percusion synth design and problems.
> 
> Just a note:
> 
> In order to demodulate an AM radio signal, all you need is a small
> non-linearity. As it happens, virtually any oxidized metal will act in some
> fashion like a diode and decode AM. So the best bet is to clean all your
> connections.
> 
>> From: "Jay Schwichtenberg" <jays at aracnet.com>
>> Date: Sun, 13 Apr 2003 15:12:36 -0700
>> To: <synth-diy at dropmix.xs4all.nl>
>> Subject: RE: [sdiy] percusion synth design and problems.
>> 
>> Typically:
>> 
>> Long leads to inputs on op-amps/transistors.
>> 
>> Bad grounding or possibly unconnected grounds.
>> 
>> Power supply issues. Might try ferrites/inductors and higher freq bypass
>> caps.
>> 
>> How far you are away from a radio station. A friend lived a couple of
>> hundred yards away from one of the major radio/tv towers. He wrapped his
>> whole studio (well except the floor) in tin foil and grounded it all. Still
>> didn't keep all the RF out.
>> 
>> 
>> Good luck.
>> Jay
>> 
>> 
>>> -----Original Message-----
>>> From: owner-synth-diy at dropmix.xs4all.nl
>>> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Arun Bohm
>>> Sent: Sunday, April 13, 2003 2:24 PM
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: [sdiy] percusion synth design and problems.
>>> 
>>> 
>>> 
>>> Hi, Was working on this here percusion synth idea and was wondering why,
>>> instead of damped oscillations, I was getting so much noise.
>>> Because I am a
>>> novice, I am used to making the mixing stage from manuals I got
>>> from radio
>>> shack(don't laugh, please) the amp I use is a utility amp using a
>>> 386 chip.
>>> The end result is all this RF transmission (I actually get some
>>> AM station)
>>> and a bunch of noise. What can I do to eliminate this problem? Any
>>> suggestions would be appreciated.
>>> arun_bohm at hotmail.com
>>> 
>>> 
>>> _________________________________________________________________
>>> 
>>> 
>> 
>> 
>> 
>