[sdiy] substitute for LM307 in voltage to constant-current converter

aankrom aankrom at bluemarble.net
Mon Mar 12 00:13:19 CET 2012


I'm building a circuit for an XR2206 function generator that cleverly 
uses an opamp driving an FET to provide a current input to the frequency 
pin of the XR2206. The opamp called for is an LM307. I was wondering if 
an LM301 would fit the bill, since I have some of those. Looking at 
datasheets, it looks like the LM301 is more or less just an 
uncompensated version of the LM307. The circuit is from 1985, when 
LM307's were easy to be had. I thought since I have even more LM301's in 
my parts bin than LM741's, I might as well give it a shot.

Any ideas for low frequency compensation if I should decide to modulate 
this input with an LFO or sweep generator? (Like should Ineed any at 
all?)

Cheers,
Anthony



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