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Microphone Circuits   Page 1
Microphones:  #-B     C-F     G-L     M      N-V

Last Updated on: Tuesday, April 01, 2014 04:29 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
1.5 Volt Amplified Ear -  Useful to listen in faint sounds1.5-Volt Battery operation, includes electret microphone preamplifier which runs from1.5-Volt DC and can directly drive32 Ohms impedance mini-earphones....
2 Wire Remote Microphone Amplifier -  uses special Amplifier module from Op-Amp Labs (added 6/06)
4-Transistor Transmitter (Paul C. Sherby) -  This circuit provides an FM modulated signal with an output power of around 500mW.  The input microphone pre-amp is built around a couple of 2N3904 transistors (Q1/Q2), ....[Tony van Roon's circuit]
A Vacuum Tube Microphone Preamp/ Direct Box Project -  From January 1997 EQ Column, includes phantom power supply....(Circuit design added 9/06)
AN-60-032  Uses & Advantages of “MERA” Dual Matched MMIC Amplifiers -  Application Note MiniCircuits.com  (app note added 2/06)
AN827: Using KEELOQ to Validate Subsystem Compatibility -  Microchip Application Note Published 13-Feb-02  (app note added 2/06)

Audio Level Meter -  Audio levels can be monitored using a small panel meter with this circuit built from discrete components.  The circuit has a flat frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for a full scale deflection on a 100uA meter. Built on two common emitter amplifiers, the first stage has a preset resistor which may be adjusted for a FSD. The last stage is biased to operate at roughly half the supply voltage for maximum ac voltage swing. Audio frequencies are passed through the 10u dc blocking capacitor and the full wave bridge rectifier converts the signal to a varying dc voltage....(schematic design added 01/2010)
Audio Voice-Over Circuit -  (electronic design added 6/07)

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)
Basic electret microphone powering circuits  -  This is  basic electret microphone powering circuit which you can use as generic reference when receivign circuits which use electret microphones. The putput impedance is determined by R1 and R2. If you leave out R2  output impedance is roughly  resistance of R2.  (added 2/06)
Bat detector microphone pre-Amplifiers -  The microphone pre-amplifier has the job of amplifying and conditioning the signal coming from the microphone. In case of an electret microphone, the amplifier must have a gain that increases with frequency to compensate for the low sensitivity of the microphone for high frequencies. Also the low frequency part must be filtered out. In case of a piezo transducer,(circuit added 08/08/08)
Bat detector microphone pre-amplifiers -  I have found this circuit to have better sensitivity, both in distance to a visible bat and in audio frequency, than some other published circuits using a 40kHz transducer with 4000x gain amplification, though the 40kHz transducer I used for the comparison may have a bearing on these results. [Circuit design by Chris Eve]
Battery powered electret microphone -  Note: scroll down to this this circuit.  This circuit can be used with normal tape recorders and sound cards which usually are designed for dynamic microphones. When you build this circuit inside  microphone case (or to small external box) you can make yourself an universal microphone out of an electret capsule. (added 2/06)
Battery Powered Electret Microphone #2 -  Note: scroll down to this this circuit.  This circuit can be used with normal tape recorders and sound cards which usually are designed for dynamic microphones. When you build this circuit inside  microphone case (or to small external box) you can make yourself an universal microphone out of an electret capsule. (added 6/06)
Big Ear Stereo Parabolic Microphone -  This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. Typical parabolic microphones are monophonic, this unit has a stereo audio path that helps produce more realistic sounding audio. The Big-E can be used with headphones or as an audio source for a stereo tape recorder(added 6/06)
Big-E Stereo Parabolic Microphone -  This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. Typical parabolic microphones are monophonic, this unit has a stereo audio path that helps produce more realistic sounding audio. The Big-E can be used with headphones or as an audio source for a stereo tape recorder(added 10/05) [(C) G. Forrest Cook January 1, 2005]
Binaural M ICs -  (electronic schematic / circuit added 4/02)
Binaural Microphone System -  A low-cost, hi-fi binaural mic setup for unencumbered recording of stereo sound, typically with  new Minidisc recorders. (Circuit design added 9/06)
Boundary Layer Dish Microphone -  ideas for a directional microph1-assembly   (added 5/02)

 
Microphones:  #-B     C-F     G-L     M      N-V
 


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