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This is another super-simple Weekend Projects circuit design but I admit the four-amps-in-one aspect of the LM324 might seem confusing at first. This Texas Instrument data sheet [PDF] on the LM324 might help clarify some questions. On the first page, you can see the pin orientation. Each op-amp is numbered counter-clockwise starting from the top-left of the IC. So op-amp #1 is 1OUT, 1IN-, and 1IN+, and so forth for each op-amp. As noted. we’re only using two amps in this circuit, or pins 1-3 and 5-7. Pins 4 & 11 are also used as our IC’s power pins, operating as the common-collector voltage and GND, respectively.
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