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Audio Circuits:  Preamplifiers  Page 1
Audio Preamps:   #-G        H-O         P-R          S-Z
Last Updated on: Thursday, May 15, 2008 09:16 AM
Audio Circuits -- Main Page
 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

4.5 H. Magnetic P.B. Head PreAmplifier :  (diagram added 6/03)

AN-79: IC PreAmplifier Challenges Choppers on Drift:  National Semiconductor Application Note   (app note added 2/06)

Audio PreAmplifier #1:  (electronic circuit added 9/03)

Audio PreAmplifier #2:  (schematic / circuit added 10/02)

Balanced Low Noise Microphone Preamp:  very low noise, close to the theoretical 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 and Artificial Earth:  (schematic / circuit design added 9/02)

Computer Microphone:  adapting electret microphone to soundcards with dynamic microphone inputs (added 5/02)

Digital Quality Microphone Pre Ampl. using the Model 425 Opamp :  (diagram added 6/03)
Dual Preamp A/B Box: (electronic circuit added 11/06)

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.  (added 2/05)

ECM MIC PreAmplifier:  (schematic / circuit design added 9/02)

Electret MIC Amplifier:  (diagram added 6/03)

Electret Mic Preamp:  (electronic circuit added 10/06)

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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