Piezo stereo preamp

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#22
JMFahey said:
Your schematic on post#15 looks good.
TL072 is the one used by EVERYBODY (Marshall/Fender/Laney/Peavey/Crate /..... /etc.)
Maybe there's a reason for that. 😉

EDIT: why do I suggest an "old boring" Op Amp, instead of a "new exciting" one?
Well, it depends on goals.

If you already built a dozen Mic preamps and are bored stiff with them, ok, start plugging new chips in the old circuits.
Personally I'd try to design new circuits, but hey, that's me 🙂

But as you seem to need a working Preamp to actually be used to make Music, well, I'd try to avoid (unnecessary) surprises and build a robust well tried circuit.

Otherwise, you are walking a minefield.
As in: did you notice the MCP6022 is designed for PSUs of 2.5 to 5.5 V (single rail)?
With an absolute max rail of 7V?
Meaning that 9V battery would probably destroy it.
Not nice to find that after you built it 🙁
Click to expand...

Well spotted, thank you.
 
#23
yes there are odd "standard" V supply for some of these but 12 V(total) is common - you do have to check since 6-7 V breakdown processes are used for "5V" single supply CMOS op amps and a few rated even lower for 1-2 cell battery operation
 
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