who here builds discreet opamps? i need some help with mine.

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versuviusx

Well-known member
Joined
Sep 12, 2004
Messages
227
Location
Wilmington,NC
hi i'm looking for someone to help me refine my opamp. i'd love for someone to help me refine it and make it better. if you have any experience with this. please email me.
i'd love to hear from you.
 
well i was hoping someone would say that they have experience in building opamps and then i could send some boards to them and they could help me make it better.
 
opampvj7.jpg
 
I don't think you need a current source for Q5--simply connect the collector to the positive supply line and make R9 about 1k.

Make D5 a diode-connected TIS98 and set R6 = 10k.

What does C1 and C3?

You might increase C2 up to 10 nF for better phase margin.

If you need higher slew-rate and open loop gain, two-pole compensation may do the trick.

And please redraw the schematic a bit--took me five minutes to figure out the bias of Q5 and Q6...
[Edit:] Wait, it still doesn't make any sense--you must have mixed up emitter and base of Q2.

Samuel
 
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