Bruce,
I've seen this too - I believe it's just laziness on the designers part.
(MOTM schemo's always show the power connections.) I think it's fair to
assume that there is power connected. However, I don't think it's fair to
assume that a bi-polar power supply is used! I believe that some op amps
can be operated with a single polarity (usually positive) and ground.
Cheers,
George
----- Original Message -----
From: <bruce@...>
To: <motm@yahoogroups.com>
Sent: Friday, June 15, 2001 6:14 PM
Subject: [motm] OT - Daffy OpAmps / Where's my power?
Ok, off topic question about schematics and Op Amps.
I have seen a lot of schematics that involve Op Amps, yes they seem to
make the world go 'round. I am no expert on schematics. but one thing
is troubling me.
I see these lovely OpAmps connected with the + input, - input and the
output. Many times I don't see any other connections. Now I am
pretty sure that these things take V+ and V- (to the chip) to make
them run, but they don't show on the schematics.
Are these connections just assumed? Or are there real ways to use
OpAmps with just the 2 inputs and the output with no power applied?
Thanks in advance for the answers.
Bruce
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