It's not laziness, it's preference. It has to do with clutter. A page full
of op-amps becomes very cluttered with power pin info, and that can detract
from communicating the intent of the design. With op-amps, there is almost
always feedback components drawn around the opamp, and having to go around
the power pins makes it more messy. I like to keep the op-amps free of power
pins, but somewhere else on the schematic I show a power block for each one.
To me, it's the best of both worlds. But that's MY preference. :)
Tony Karavidas
Encore Electronics
http://www.EncoreElectronics.comDesigners of "The best MIDI to CV converter on the planet." -Keyboard Oct.
1997
> -----Original Message-----
> From: George Kisslak [mailto:groovyshaman@...]
> Sent: Friday, June 15, 2001 3:44 PM
> To: motm@yahoogroups.com
> Subject: Re: [motm] OT - Daffy OpAmps / Where's my power?
>
>
> 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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