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|previous: Jay Doyle Re: A Couple of Simple Ideas -- 10/31/2000 5:03 PM||View Thread|
|10/31/2000 7:15 PM|
|Doug H||BJT Stuff|
Forgot to add this to the last one:
The first version of the Rat used a 1M for the bias resistor, with an LM308 bjt opamp. Not sure if that value is really a problem or not. In later versions they lowered it to 220k, I don't know if that was to supply more current, or to lower input Z to reduce noise. I know with the TL072 it has the latter effect, without noticeably rolling off highs. That came in pretty handy for a gainy circuit like this.
I'll be curious how it behaves when my LM308's come in. Like I mentioned before, I'm not too interested in BJT opamps, except this particular model. But it does make a good testbed, like you said.