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Schematics and PCB for a microphone preamp with phantom power
A small PCB that uses two TL082BCP op amps to amplify a signal from a contact microphone.
Alembic F2b tube preamp schematic
Electret Microphone Preamp based on Texas Instruments Single-Supply, Electret Microphone Pre-Amplifier Reference Design by John Caldwell
CSR64215 + PCM5102 + PreAMP(Dual OPA227)
Ampeg B115R tube preamp schematic
1985-2021: Douglas Self's classic Nov 1976 Wireless World discrete transistor op-amp preamplifier. First built in 1985 (rehoused 2021), and later completely rebuilt.