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In Reply to: RE: how to remove feedback loops posted by vinnie2 on June 11, 2017 at 14:07:35
I drew this up for you vinny... try it on your breadboard if you like.
lm334 ccs uses 20 ohm rset to ground. negative supply is optional but not needed.
you could use a trimmer instead of 20 ohm resistor... 10 ohms is 10ma I think, 68 ohms is 1mA.
should be class A operating point. 12at7 driver as ran differential pair/LTP.
I've done it with 12at7, 12au7, 12ax7. very simple circuit.
Thanks for the plan and the other info. I will have to see if I have a 334 around or order one. Don't use too many SS parts. Thanks again!
here's the ultra simple LM334 CCS.. (current sink)
yes a cascode works better, yes a negative supply is better with a CCS.... but this works and is simple as can be.
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