Schematic Reading Help

audioguru

Well-Known Member

Most Helpful Member

• Jan 15, 2010

• #41

Any opamp circuit can use a single positive supply if its input, output and feedback to ground are capacitor-coupled and the input of the opamp is biased at half the supply voltage like this: https://www.electro-tech-online.com/threads/basic-opamp-circuits.35258/

 

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DBIRKY

New Member

• Jan 15, 2010

• #42

Thanks for the reply. I guess what I was asking is the schematic notation confused me. Used to seeing +5V and GND but not -5V. Just wondered what the negative power was and how to achieve it.

 

D

DBIRKY

New Member

• Jan 15, 2010

• #43

I was looking at this circuit and was wondering how the + and - voltages were achieved: http://xoscope.sourceforge.net/hardware/buff.gif

Thanks!
Doug

 

audioguru

Well-Known Member

Most Helpful Member

• Jan 15, 2010

• #44

It uses a plus and minus 12V power supply circuit, not a single supply voltage wall-wart.
I showed you how to change the circuit so it works from a single positive supply wall-wart.

 

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DBIRKY

New Member

• Jan 17, 2010

• #45

I appreciate the info.
Thanks!