how to troubleshoot? Not all of us have trustfunds!

[Theo]

I second this.
There is lots that can be done with only a DMM and maybe a set of small
earphones to trace the signal.
(best old fashion crystal high Z type)
And for monitoring a LFO or audio frequent signals a free/share-ware soft
scoop will do nicely.

Or do you really need that Pentax ultra zoom computer controlled motordrive
with night vision look it cost me $$$$$ photo camera  too take a few family
snaps?

Cheers,
Theo


------------------
----- Original Message -----
From: Paul Perry <pfperry at melbpc.org.au>
To: <synth-diy at node12b53.a2000.nl>
Sent: Sunday, January 14, 2001 12:16 PM
Subject: Re: how to troubleshoot? Not all of us have trustfunds!


> At 10:08 PM 13/01/01 -0800, RFAHL wrote:
>
> >Also, couldn't you use an audio cable as a probe between the circuit and
an
> >audio amp (with a DC blocking cap for protection), using your ears
instead
> >of your eyes?
> >
> This is very good advice indeed.
> Back in the days of discrete radios, and even today for valve amps,
> some people would permanently set up a 'test' one with links between
> the setions, so you could send & receive signals to the unit being
> fixed.
> I'm suprised how often it is possible to 'diagnose' a circuit without
> ANY test gear at all, when people on the lists ask what 'might be wrong'.
> The best advice i ever saw, went along the line that the 'broken' gear
> you are working on isn't really 'broken', it is just that it has somehow
> been transformed into some OTHER circuit. And, you have to find what
> THIS circuit is. The reverse logic here often leads to insight.
>
> http://polly.phys.msu.su/~zeld/oscill.html
> was mentioned on the guitar fx bbd as a real time audio scope for an
> IBM soundcard. I havn't tried it myself.
>
> paul perry melbourne australia
>