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Old 2nd May 2002, 05:22 PM   #1
dorkus is offline dorkus  United States
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Default Walt Jung IC opamp/buffer combo vs. discrete?

i'm sure many of you have seen the Walt Jung articles, "Walt's Tips & Tools" on planetee.com where he describes tricks for optimizing opamp performance. have any of you tried the opamp/discrete buffer combo he suggests? wonder how it sounds compared to a good discrete circuit, in particular a simple discrete opamp design as shown in Nelson Pass's opamp article. i'm also wondering how the Class A buffer sounds by itself, maybe it's possible to

i am most likely going to build my multi-channel preamp with opamps of some sort or another but am not sure whether to start tinkering with discrete circuits or go with tried-and-true IC layouts. i'd rather avoid using ICs if possible (actually no circuitry at all would be ideal of course ) but i don't know if i have the perseverence to tweak endlessly with a discrete design. any thoughts?

cheers,
marc
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Old 2nd May 2002, 05:35 PM   #2
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p.s. i have a thread from last june that asked a similar question of discrete vs. IC, and i got some great responses... however i'm still looking for someone that has tried the Walt Jung circuit with a good opamp e.g. AD825. any thoughts would be appreciated. thanks!
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Old 2nd May 2002, 05:53 PM   #3
jam is offline jam  United States
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Marc,

I am an advocate of single ended mosfet buffers. Most ic's require an additional buffer added into their feedback at the output of the ic. Feedback should correct any offset caused by the buffer.

Jam

P.S. I noticed that you spell Nelson Pass's name with capitals thus avoiding any stray bolts of lightning.
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Old 2nd May 2002, 05:54 PM   #4
dorkus is offline dorkus  United States
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Quote:
Originally posted by jam

P.S. I noticed that you spell Nelson Pass's name with capitals thus avoiding any stray bolts of lightning.
yeah... i learned my lesson...

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Old 2nd May 2002, 10:40 PM   #5
dorkus is offline dorkus  United States
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jam,

will a single-ended FET buffer work inside a feedback loop? i thought with single-ended circuits, capacitor coupling was the only way to eliminate offset because the output has to kept in the linear operating region of the transistor, thus creating the DC offset... won't cancelling this offset with the feedback loop cause problems?

marc
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