[sdiy] LM13700 questions

[Tim Stinchcombe]

> You would be a diode away from the negative rail. Also 
> consider that the 
> LM13700 output can be bi-polar where as the input only takes one 
> polarity. Voltage difference would come in the way.

According to the equivalent schematic on the datasheet it is actually going
to be _two_ diode drops above the negative rail (this is reflected in the
SPICE model as well); also the output looks like it can go to within a diode
drop of the rails, and this (if I'm reading it right) is also given by the
'peak output voltage' chart on page 4, which shows it can go to 0.5V of the
rails. Thus I don't think there will be any problem driving the Iabc of one
section with the output of the other!

Tim
__________________________________________________________
Tim Stinchcombe 

Cheltenham, Glos, UK
email: tim102 at timstinchcombe.co.uk
www.timstinchcombe.co.uk