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In Reply to: Op Amps running Class A? posted by AudioTweaker on March 22, 2001 at 16:29:28:
Actual implementation is trivial. Connect a 4.99 kohm resistor between the op-amp output and the -15V line. This comes from the POOGE Chronicles. I've tried it and it works well.
Ciao
Ryan
Follow Ups:
Also what are the offset null pins used for in single op amps? Does the value of resistor need to be played with to any large degree? What wattage rating on resistor? I assume metal film and matched pairs. Thanks in advance for answering these questions.
If I am using a dual Opamp (BB OPA2604) I connect a 5 kohm R between pin 4 (-V) between/across both pin 1 (output A) and pin 7 (output B)? Therefore 2 resistors required for each dual opamp?Thanks in advance.
I've added a 0.25 Watt 5Kohm 1% resisitor on the opa2604's of my preamp. That is one resistor per 2604 chip, from pin 4 to pin 7. I didn't mount any heat sink, but up to now about 3 hours, everything is good.
Amazingly sweet !!Thank you, all of you.
unless you get some heatsinking on that. It'll just burn out sooner on you, and still could just overheat on you soon. Get the heatsink and be safe. Op-amp's dont like to run very hot anyway.
They run really hot. Thank you Andy.
Your advice is reasonable. I'm now building some tiny heatsinks using metal fuse holders. I'll stick them to the chips using heat dissipating gel.
Thank you Andy !!!
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