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HI FI Preamp - (electronic circuit added 4/05)

HI FI PreAmplifier - (schematic / circuit design added 9/02)

Hi-Fi Preamp - Another preamp, but this one has tone controls, and all pots are PCB mounted  (added 6/07)

Hi-Fi Preamplifier - This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input….(added 07/07/07)

High Performance Audio Applications of the LM833 - RIAA Phono preamplifier stages and active crossover ne2-rks (app note added 3/03)

High Quality Audio Preamp - An audiophile quality preamp, with full switching and programmable gain  (added 6/07)

IC Mic Preamp uses Jensen Twin-Servo Circuit Topology - AS082 Jenson Transformer Application Note  (app note 11/02)

IC PreAmplifier Challenges Choppers on Drift - National Semiconductor Application Note  (app note added 2/06)

Intercom Preamp - a convenient way of making an intercom is to use a loudspeaker as a microph1(added 6/06)

JFET Double Balanced Mike Preamp - Based on a design by Graeme Cohen AES Preprint #2106  (circuit design added 08/08/08)

JFET Mike Preamp using Jensen JE16 Input Transformer - (electronic circuit added 08/08/08)

Light Controller Variations - Diagrams are for12V operation and there are high side (common ground) and low side (common +12V) versions (added 5/02)

LM358 Preamp - (electronic circuit added 7/03)

Low impedance microphone Amplifier - The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don't build the impedance adapter part with T1, you get a micamp for higher impedance microphones.....(electronic schematic / circuit added 2/05)

Low Noise Balanced Microphone Preamp - A discrete front end makes this balanced microphone preamp very quiet, and it has excellent noise rejection.  Since the SSM2017 has been discontinued (sad but true), and if you can't get the INA217 this may be the ideal replacement…(added 4/02)

Low Noise Microphone PreAmplifier - Simple unbalanced design, suitable for microphones, very low noise  (schematic / circuit design added 9/02)

Low Voltage PreAmplifier - A low voltage preamplifier optimized for 3 Volt operation. (added 10/05)

Masthead Preamp - (diagram added 6/03)

Microphone PreAmplifier - This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements). The idea of this circuit is to keep the design as simple as possible....(electronic schematic added 8/02)

Minimalist Discrete Hi-Fi Preamp - (schematic / circuit design added 9/02)

Modular Audio Preamplifier - High Quality, Discrete Components Design.  Input and Tone Control Modules.  (schematic added 6/07)

MOSFET-Based PreAmplifier for FM Radio Dxing - (electronic Circuit / Schematic added 10/04)

MW PreAmplifier - The tuning voltage is variable from 1 to 12 volts and is designed to cover the medium waveband from about 550Khz to 1650Khz. (added 6/03)

Neumann U67 microphone preamp power supply - (diagram added 2/07)