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Make: Analog Synthesizers by Ray Wilson

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Appendix A. A Field Guide to Op Amp Circuit Applications

Buffers

Here are some circuits you can use when you need to boost the level of a signal. Typical op amp outputs can only source or sink about 4 to 5 mA before the output begins to degrade and distort. When driving LEDs with an op amp, this current drive limit isn’t a big deal, ...

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