![]() Dual potentiometer R1A serves as variable input-attenuator (the dual pot controls both channels) R2 isolates C2, which capacitively couples the input. The left and right channels are identical. The circuit gets its zip from two National Semiconductor LM386 Low Voltage Audio Power Amp ICs, one for each side of the stereo path. It’s great for practice, multitrack monitoring, or just plain listening as a receiver/integrated-amp substitute. ![]() This do-it-yourself stereo headphone amp sounds clean and clear, and uses just two, inexpensive chips. The cheesy headphone-amp circuits in most stereo gear aren’t up to the standards of the main amp components, and many CD players and cassette decks don’t even have them. ![]() There are probably as many headphone amp designs as there are headphones, but all aren’t created equal. Sometimes they sound so fuzzy I want to hide behind the couch until it’s over. ![]() The ping of the cymbals, crack of the snare drum, thonk of the bass – none of these comes through on my low-budget speakers. ![]()
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