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Audio Circuits:  Preamplifiers  Page 1
Amplifier -- Main Page          Audio Circuits -- Main Page
Audio Preamps:   #-G        H-O         P-R          S-Z
Last Updated on: Monday, March 09, 2015 04:11 AM


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

4.5 H. Magnetic P.B. Head PreAmplifier  -  Schematic only, no circuit description included]
Altec 1564A Preamp Power Supply -  (circuit diagram added 2/07)
Altec 428B Microphone Preamplifier schematic -  (circuit added 2/07)
API 321 mic preamp schematic -  (electronic schematic added 1/07)
Audio Pre-Amplifier -  This simple circuit provides good gain to weak audio signals…. [Tony van Roon's circuit]
Audio PreAmplifier (Reconnsworld) -  this is a very easy circuit to build, all parts can be found at the local electronics shop, no matter how worthless it (the local shop,) usually is....(electronic circuit added 9/03)

Balanced Low Noise Microphone Preamp -  very low noise, close to  oretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks  (added 8/03)
Balanced Microphone Preamp -  (diagram added 6/03)
Band 2 PreAmplifier -  (diagram added 6/03)
Car PreAmplifier & Artificial Earth -  Especially for car audio installations, can be used for any single supply system (schematic / Circuit design added 9/02)
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)
Digital Quality Microphone Pre Amp using the Model 425 Opamp  -  (diagram added 6/03)
Dual Mike Preamp power supply Gerber -  (electronic circuit added 08/08/08)
Dynamic Microphone Preamp  -  Notice how the transistor bias current flows through the microphone. A similar circuit can be used with an 8 ohm speaker but in that case you would put it in place of the emitter resistor.... [Reverse engineered schematic by Stepan Novotill]
Dynamic Microphone Preamplifier -  A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance....(electronic design added 6/07)
ECM Mic Preamplifier -  A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components…. [Designer Andy Collison]
Electret MIC Amplifier -  (diagram added 6/03)
Electret Mic Booster -  ….must register on this site... [Published in Elecktor July/August 2010]
FET Preamp Cable -  (diagram added 6/03)
FM Band PreAmplifier -  (electronic circuit added 7/03)

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

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