Electronics

Factual Questions
1

I was wondering if someone could help me with the following electronics problem.

I am currently trying to implement a circuit using a LM13700 Operational Transconductance Amplifier.

I basically want to use it as a voltage controlled current source. However when I vary the input voltage the output current does not change.

The bias current Iabc is at 4uA and the diode current Id is at 1mA.

The supply voltage is + and - 8V.

Does anybody have any idea whats wrong?

2

It would be a whole heck of a lot easier to diagnose your problem with a schematic. If you can sketch one out and toss it up on Yahoo! or something, we can probably figure it out. Without seeing the circuit, I’d only be throwing darts in the dark.