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Audio Circuits: Preamplifiers Page 3
Amplifier -- Main Page Audio Circuits -- Main Page
Audio Preamps: #-G H-O P-R S-Z
Last Updated on: Monday, October 03, 2011 06:07 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Phono Preamp Valve - tube design (added 4/02)

Phono Preamplifier - Simple circuitry suitable for moving-magnet cartridges; Passive high-frequency equalization....(schematic / circuit added 6/07)

Phono Preamps For All - Various circuits for moving coil and moving magnet pickups (schematic added 6/07)

Phono RIAA Preamp - Very high quality moving magnet phono preamp, few circuits will better this one. (schematic added 6/07)

Phonograph Disc Playback PreAmplifier - (diagram added 6/03)

Portable Microphone Preamplifier - High headroom input circuitry. 9V Battery powered. (added 9/04)

Preamp/ Crossover Muting Circuit - Muting circuit suitable for all line-level applications. (schematic added 6/07)

PreAmplifier Computer Microphone - This circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms. Lazar has adapted the sound card to use a common electret microphone using this circuit....(electronic design added 6/07)

PreAmplifier for Microphone or Guitar Use - suitable for guitar or microphone use. (added 7/03)

Preamplifier Power Supply - Uses External AC Adapter. Safe and effective, low noise and no hum! (PCB replaced by P05A) (schematic added 6/07)

Quality Microphone Pre Ampl. using the Model 425 Opamp - (diagram added 6/03)

RCA BA-1A two-stage preamp schematic - (electronic circuit added 2/07)

RCA BA-21A preamplifier schematic - (schematic / circuit added 2/07)

RCA BA-31A preamplifier schematic - (diagram added 2/07)

RIAA Equalized Stereo Phono Preamp - (electronic circuit added 4/05)

RIAA phono amp - Schematic only, no circuit description

Simple Balanced Mic Preamp - This is a "utilitarian" preamp. Although not intended where lowest noise is needed, it is still quiet enough for most applications, and will almost certainly be all that's needed for adding a microphone input to an amplifier or powered speaker. (added 08/08/08)

Audio Preamps: #-G H-O P-R S-Z