[sdiy] percusion synth design and problems.

[harrybissell]

And clamp-on ferrite beads around those speaker leads as well... I had
noise ride into a mixer on the OUTSIDE of the output cables... even if you
short-circuited the cable tip-to-sleeve

H^) harry

John L Marshall wrote:

> Jim Patchell is the king of bypass.
>
> Put a 0.1uF at each opamp supply to ground.
> Unused inputs are generally very high impedance and will act like an
> antenna.
>
> Are you doing this work on one of those white proto boards? A ground plane
> will help a lot.
>
> I had a friend that lived next to an over the horizon radar station. He
> stereo had a periodic bizzt. The ultimate solution: Put the stereo in a old
> refrigerator. ground the refrigerator. Use shielded wire to the speakers.
> Ground the shield to the speaker frame.
>
> Take care,
> John
> www.sound-photo.com
> ---------------------------------------------------------------------------
>
> ----- Original Message -----
> From: "Arun Bohm" <arun_bohm at hotmail.com>
> To: <john.l.marshall at gte.net>; <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, April 13, 2003 3:28 PM
> Subject: Re: [sdiy] percusion synth design and problems.
>
> > Thank you for responding so promptly. I am not sure about how close the
> > station is I can barely make out the transmision so it can't have too much
> > strength where I am at. What exactly would the power supply bypass be and
> > where would I do the filtering. I have been told that putting a 1uf Cap
> > across the power rails helps. is this filtering or bypassing. I think its
> > filtering. What would I do to bypass. I will try grounding Unused
> terminals
> > tonight. Once again thank you. I really appreciate the advice. You and
> > magnus and sometimes peasant are great help. I am just thankful for the
> > list.
> >
> >
> >
> >
> > >From: "John L Marshall" <john.l.marshall at gte.net>
> > >To: "Arun Bohm" <arun_bohm at hotmail.com>, <synth-diy at dropmix.xs4all.nl>
> > >Subject: Re: [sdiy] percusion synth design and problems.
> > >Date: Sun, 13 Apr 2003 15:15:13 -0700
> > >
> > >The downside of wide bandwidth amplifiers. Solutions: proper shielding,
> > >proper grounding, ground all unused inputs, additional power supply
> > >bypassing, and low pass filtering.
> > >
> > >How close is the AM station to you?
> > >
> > >
> > >Take care,
> > >John
> > >www.sound-photo.com
> >
> >
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