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Microphone Circuits
Microphones:  #'s - D        E - N        MS        T - Z

 

Last Updated: October 09, 2017 03:39 PM

Circuits Designed by Dave Johnson, P.E. :
Band Drummerís Microphone SwitchI received an email from guy who plays drums for a small band.  He wanted a simple way to turn on and off his microphone with just a tap of his drum stick onto a small box.  The circuit below performs this task with the aid of a piezo device as a shock sensor and a small dual coil latching relay with two sets of contacts.  The contacts can be wired any number of ways to a microphone circuit . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2011

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 __ Contact: Flavio Dellepiane, fladello @ tin.it

1.5V iPod Microphone -  Works with: 3rd & 4th Generation and the original color iPods.  Does not work with: 1st, 2nd & 5th Generation, nano, mini or shuffle iPods __ Designed by © Scott Mitchell

30 Watt PA For 80 Metres -  Q1 and Q2 are IRF521 MOSFETs.  The input transformer is 6 turns trifilar wound on a pair of stacked Ferrite cores.  The output transformer primary is 1 turn, centre tapped, of brass tubing.  I used a section of telescopic aerial from a portable radio.  Perhaps I got a bit carried away, but I removed the chrome plating in an effort to reduce RF losses due to skin effect.  The output transformer secondary is 3 turns of insulated wire.  The transformer core is made from 6 Ferrite toroids, 3 on each brass tube.   __ Designed by EI9GQ homebrew radio

4-Transistor Transmitter -  4 Transistor TransmitterCircuit + Parts Lits + Notes __ Designed by Paul C. Sherby

A Vacuum Tube Microphone Preamp/ Direct Box Project -  From January 1997 EQ Column, includes phantom power supply

AF Pre-amp for Kenwood Mc-50 microphone to improve high frequency responce (high emphasis) -  Ham RadioSchematic __ Designed by Guy Roels ON6MU

AGC Dynamic Microphone -  Dynamic microphones have a fantastic dynamic range, easily handling whispers to rock concerts.  The signal level range coming out of a dynamic microphone can be huge and an AGC amplifier can prove quite handy.  This project employs an old hobby dynamic microphone mounted in a film canister with the AGC amplifier tucked inside.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

An Automatic Mike Muter for Singing Guitarists -  The average musical Do-It-Yourselfer starts building guitar effects by making a distortion pedal of some sort.  It's a good introduction to musical electronics, and pretty simple as well, since getting a circuit NOT to be linear has never been hard.  But there comes a time when you have to stop thrashing the strings in your bedroom, get up on stage and *play*.  When you get to there, you run into all kinds of little problems that you never encountered back in your room.   __ Designed by R.G. Keen

AN-60-032  Uses & Advantages of MERA Dual Matched MMIC Amplifiers -  AN-60032 Application Note__ MiniCircuits.com

Astatic microphone to Kenwood mic -  Ham RadioSchematic __ Designed by Guy Roels ON6MU

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 __ Designed by Andy Collison

Audio Voice-Over -  This is a circuit where a microphone and preamp circuit    (voice circuit) have priority over any other audio signal.  You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal.   __ Designed by Andy Collinson

Automatic Mike Muter for Singing Guitarists -  The average musical Do-It-Yourselfer starts building guitar effects by making a distortion pedal of some sort.  It's a good introduction to musical electronics, and pretty simple as well, since getting a circuit NOT to be linear has never been hard.  But there comes a time when you have to stop thrashing the strings in your bedroom, get up on stage and *play*.  When you get to there, you run into all kinds of little problems that you never encountered back in your room.   __ Designed by R.G. Keen

Balanced Low Noise Microphone Preamp -  A discrete front end makes this balanced microphone preamp very quiet __ Designed by Rod Elliott  ESP

Band Drummerís Microphone Switch -  I received an email from guy who plays drums for a small band.  He wanted a simple way to turn on and off his microphone with just a tap of his drum stick onto a small box.  The circuit below performs this task with the aid of a piezo device as a shock sensor and a small dual coil latching relay with two sets of contacts.  The contacts can be wired any number of ways to a microphone circuit . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2011

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,  __ Designed by Bertrik Sikken

Battery Powered Electret Microphone -  This is the 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 the output impedance is roughly the resistance of R2. __ Designed by Tomi Engdahl

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 insidemicrophone case    (or to small external box) you can make yourself an universal microphone out of an electret capsule.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Battery Powered Electret Microphone #2 -  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 the microphone case  (or to small external box) you can make yourself an universal microphone out of an electret capsule. __ Designed by Tomi Engdahl

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 recorder.  It can be plugged directly into a computer sound card's aux input.   __ Designed by © G. Forrest Cook January 1, 2005

Binaural MICs -  I used the plans from http://www.arches.uga.edu/~tidmarsh/binmic.html.  I'm no electronics expert but can solder, and it was very easy.  If you want to build a battery box you'll probably want some fine gauge wire and a little piece of circuit board in addition to the components listed. __ Designed by Doung Brown

Classroom Microphone SystE - M -  This audio amplifier circuit is useful in classrooms to reduce the strain of lecturing , if the surrounding environment is noisy.  It uses the power amplifier IC LM380 that gives 2 watts output which is sufficient in a confined area.  The amplifier is portable and the whole circuit and the battery can be enclosed in the Speaker __ Designed by D Mohankumar

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 __ Designed by Lazar Pancic

Condenser Mic Audio Amplifier -  The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts.  It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers.  Transistors T1 and T2 form the mic preamplifier. __ Designed by D. Prabakaran -  c Electronics For You Mag

Condenser Microphone Uses Dc-Coupled Impedance Converter -  03/15/12  EDN-Design Ideas Eliminate transformers and coupling capacitors in this self-balancing microphone interface.  The diaphragm of a condenser microphone is the movable plate of a capacitor.  With a polarized capacitor, the vibration of the diaphragm in relation to the back plate produces an ac audio-output voltage.  The condenser capsule has a capacitance of 10 to 60 pF; thus, you should connect it to an impedance converter with extremely high input impedance for a flat frequency response. __ Circuit Design by Dimitri Danyuk, Miami, FL

Direct Injection Box for Recording & Psystems -  An essential companion for the mixer for stage or recording work   __ Designed by Rod Elliott  ESP

Directional Microphone -  With the possible exception of sophisticated shotgun microphones or microphone arrays, effective directional microphones usually employ parabolic reflectors or horns.  Parabolic reflectors about the size of a modern satellite receiver antenna, perhaps 2 feet across, perform quite well but are a bit obtrusive.  These are commonly seen on the sidelines at football games.  But it turns out that simple horns or cones work very well as directional sound collectors, are easier to handle, and don't look like microphones.  They do look a bit like megaphones, witches' hats, or traffic cones, all of which might make great microphones! In fact, a pair of cheerleader megaphones might make a great two-way communications system __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Dual Microphones Separate Voice From Noise -  06/23/94 EDN-Design Ideas The circuit in Fig 1 uses a pair of microphones to extract a voice from a noisy background.  You must mount electret microphones X1 and X2 on the left and right sIdeas of the user's chest.  Sound sources not equidistant from the microphones experience a phase shift.  Because sound travels at 1120 ft/sec, the maximum phase shift for this design's/ __ Circuit Design by Samuel Kerem, Infrared Fiber Systems, Silver Spring, MD

Dynamic Microphone Amplifier -  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 __ Designed by Andy Collison

Dynamic Microphone Preamplifier -  A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance.   __ Designed by Andy Collison

Dynamic microphone to electret microphone input -  Circuit which works as an preamplifier which allows you to replace an electret microphone with a dynamic microphone.   __ Designed by Tomi Engdahl


Microphones:  #'s - D        E - N        MS        T - Z

 


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