[sdiy] Odd OTA behavior

[Aaron Lanterman]

On Apr 25, 2008, at 2:34 PM, Mike I wrote:

> If the OTA V(-) supply pin has mistakenly been connected to ground  
> instead
> of (-)15V, the Iabc pin will sit at two diode drops above ground (in  
> the
> case of LM13700) when current is fed through it from a resistor  
> connected to
> V(+).....
>
> Have you checked to make sure the OTA is being powered from +/- 15V  
> and not
> +15V/GND ?

I'm now guessing that was it... he was running probably ran to the  
wrong rail on the broadboard. He rebuilt it and his OTA is working  
sensibly now.

- Aaron