David  Josephson,


Got it working.


Input at Point A 1.3 v 8 usec period. 1.4 v 10 usec 1.52 v 11 usec
1.6 v 14 usec

1.81 v 32.5 usec

It quits about 1.9 volt

The pot is 5K

More later. I need something like 100 usec

May not be able to make it go that slowly with that circuit. Maybe
use a capacitor bigger than 330 pf at pin 5 to shift the whole range
down. Try the circuit in fig 15 of the TI data sheet instead.

David Josephson


OK Thanks David.

More shortly.

Paul Lamar

Is this it? Wow those are high buck :)

Paul Lamar

You sent prices for the 231, you surely don't need that, at least not
for prototype, those are higher temp version. The 131 is military temp,
the 331 is commercial. Except for QC and temp qualification I would
expect the Fairchild part and the TI part to be the same device. The TI
datasheet provides a lot more application info. It might be slightly
unethical but you can use the TI app notes with the Fairchild part.

David Josephson

Thanks David,

Yes the LM331 is a lot more reasonable.

Paul Lamar

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