Confused with 0TA3080

[Tony Hardie-Bick]

On 20/01/13 16:37, Marc Nostromo [M-.-n] wrote:
>> you have two ota stages here, so if you can see similar (confusing)
>> behaviour in both, then at least you know it's probably not them.
>
> You mean as far as knowing if they are broken or not by swapping them
> ? Because in terms of signal, if I don't get anything past the first
> one it certainly won't do anything in the second.

i'm thinking of what the dc levels are like, measured with a meter, and
maybe catching some variation due to control voltage at the output.

>> keep signal tracing. with stuff lke this, i usually find i need to
>> break after two hours or so, and some more questions occur that
>> can be tested. it's pretty good practice. in the end, with the right
>> question, you will find the answer
>
> Yeah. Finding the good questions. Precisely what I'm looking for :)
>
> I'll keep digging slowly.

that circuit is fascinating, in the use of logic inverters in the analogue
mode. crunchy

Tony (HB)