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Emitter Follower Configuration

First of all: forget about driving this LED with a single stage 2N2222 transistor at any current higher than a couple hundred mA. It will not work. If you actually tried to do it, you'd be stressing ...
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Need help with an IR demodulation circuit

The 1.65V is a midpoint reference for a the op-amp, which is using a single-ended supply (perfectly fine with the LM324.) The details of that supply would be interesting; my guess is that they use ...
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