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Simple op-amp headphone amplifier with dual-mono-ish power supply with a rosewood face : r/diyaudio
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Op Amp - Dual Rail-to-Rail - 2.7-6V power @ 80mA output [TLV2462] : ID 808 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: AtNeDcVh Mini Small Stereo Audio preamplifier, Headphone Amplifier, Gain 20dB Phono Turntable Phonograph preamp, Dual op amp NE5532 with RCA 3.5mm Input to RCA 3.5mm Output : Electronics