[sdiy] LFO

[harry]

Hi Hans....

although I am known to consider solderless breadboards in a class with
BBDs....

in the case of an LFO I doubt there is a problem with the breadboard. For

reasonably slow circuits they will work OK... capacitance should not be
an
issue.

Do you have any test equipment (scope, meter, etc...)?

Stick with one design to start with... then hunt (and again) for every
connection.
Make a photocopy of the schematic and trace every connection you make and

use a hi-lighter (or a crayon ;^)  to mark the copy. Double check all
polarized
components with extra care.

Apply power and put a fingertip on all the components... if you say ouch
(hot) you
have a problem there.

contact me on or off list I'd be glad to help you out. Don't get
discouraged.  I just spent two days debugging some poorly considered
wiring in my latest project...
two boards with 90 IC's....

H^) harry

xmurz at gmx.de wrote:

> Hello!
> I got a few questions...
> I got a +/- 12 Volt linear PSU today, which is really
> stable.
>
> I got out my breadboard and tried the Modulus LFO (of issue 8)
> with that one. However, even after 4 hours it wouldn't oscillate.
> (with a TL082)
> When I touch pin 2 of the first opamp, i get  a big pulse on my osci.
> hmmm.. somhow the feedback loop doesn't have anough power, I suppose.
>
> Then i ripped all the stuff off the breadboard.
>
> Then I had a go at the ASM-1 LFO. Same thing, doesn't oscillate.
>
> So is this because of the +-12V, of the breadboard (capacitance) or
> am I hitting hy head with a wall=?
>
> ANY help/suggestion appreaciated.
>
> Regards,
>    Hans

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