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Schematic Reading Help

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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.
 
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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