Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Wireless Microphone Circuits
Last Updated on: Tuesday, August 18, 2015 06:50 AM


Circuits Designed by Dave Johnson, P.E. :
  • Pop Free Microphone On/Off Switch Circuit  -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones . . . [Circuit by David A. Johnson P.E.,  02/15/02]

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

4-Transistor Transmitter -  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) , and audio gain is limited by the 5k preset trim potentiometer. The oscillator is a Colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF ceramic capacitors and the L2 inductor. . .  [Paul C. Sher[by's circuit]

 

Analog Front End for Femto Base Stations Brings Wireless Connectivity Home -  Analog Devices-Analog Dialogue. . .  [by Cameron, Thomas and Forbes, Peadar]

 

FM Microphone -  A micro-transmitter is so small and sensitive, it have only 8 easy-to-get parts and can be assembled in one hour. . . .  [Jose Pino]

FM Microphone -  Here is the super NEW miracle improved "Frequency Modulation Wireless Microphone" (BUG) with added easablilty, readability and copyability. This was necessitated after the number of E-Mail questions posed by people who were confused by the layout of the project (s). Before proceeding with the interesting bits, please note. . .  [from Harry Lythall's website]

 

FM Radio Microphone with Internal Loop Antenna (Area 50) -  This article began as a design guide for hyper cranial erogenic field generators, however, your primitive earth brains are completely unable to respond to erogenic fields in the 100MHz region. I personally had a brain upgrade (for purely medical purposes of course) so I am able to respond. . .  [Copyright © 1998 Wenzel Associates, Inc.]

 

FM Transmitter-Miniature -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or more. It is great for room monitoring, baby listening, nature research, etc. L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4 inch diameter form. . .  [Andy Wilson's site]

 

FM Voice Transmitter -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM radio. It has a range of up to 1/4-mile (Tony van Roon's 400 meters) or more, depending on the line-of-sight, obstructions by large buildings, etc. It is great for room monitoring, baby listening, nature research, . . .  [Tony van Roon's circuit]

 

FM Wireless Mike -  Low power frequency modulated transmitter using two transistors. The circuit works with 9v power supply. . .  [Circuit Designer's name is not listed]

 

Low-Power FM Wireless Microphone -  Small, wireless microphone that will transmit a whisper to a nearby (1/4 mile radius) FM radio, tuned to the 100 108 Mhz region of the dial. Powered by 9-volt battery, and features hand-wound inductor. This Detailed contains theory of operation, construction tips, and some testing procedures. . . . 

 

Micro Spy with FETs -  Circuit and notes only, no circuit description given. . . .  [Tony van Roon's circuit]

 

Micro Spy with TTL -  This circuit is old (70's) but since the 74LS13 is from the regular 74xx series and easy to obtain, I decided to keep the circuit in place until components are no longer available. Not much to tell here. Performance is based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'. This circuit was experimental and so has no real purpose other than tinkering. . . .  [written by Tony van Roon]

 

Micro Spy with USW -  Circuit and notes only, no circuit description given. . . .  [Tony van Roon's circuit]

 

Minature FM Transmitter -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM radio. It has a range of up to 1/4-mile (Tony van Roon's 400 meters) or more, depending on the line-of-sight, obstructions by large buildings, etc. It is great for room monitoring, baby listening, nature research, . . .  [Tony van Roon's circuit]

 

Miniature FM Transmitter -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or more. It is great for room monitoring, baby listening, nature research, etc. L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4 inch diameter form. . .  [Andy Wilson's site]

 

Miniature FM Transmitter #2 -  Miniature FM (voice) transmitter. . .  [Tony van Roon's circuit]

 

Miniature FM Transmitter #3 -  Sensitive transmitter. . .  [Tony van Roon's circuit]

 

Miniature FM Transmitter #4 -  Schmatic with parts list and notes. . .  [Tony van Roon's circuit]

 

Miniature FM Transmitter #5 -  10 transistor transmitter. . . .  [Paul K. Sher[by]

 

Miniature FM Transmitter #6 -  upto 500 meter range. . .  [Tony van Roon]

 

Miniature FM Transmitter #7 -  There is no thrill like the thrill you get from operating equipment you have built yourself. If you have never built a project from a magazine before, let this be your first--you'll see how much satisfaction and fun you can have!. . .  [Tony van Roon]

 

Miniature MW Transmitter -  circuit diagram of simple medium wave transmitter using BF494B. This simple transmitter have a range of 200 meters. . . 

 

Pop Free Microphone On/Off Switch Circuit -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off. The circuit is completely passive and will work on dynamic and electret type microphones . . . [Circuit by David A. Johnson P.E.,  02/15/02]

 

Shortwave Bug -  Circuit and notes only, no circuit description given. . . .  [Tony van Roon's circuit]

 

Simple FM Transmitter Schematic -  There is no thrill like the thrill you get from operating equipment you have built yourself. If you have never built a project from a magazine before, let this be your first--you'll see how much satisfaction and fun you can have!. . .  [Tony van Roon]

 

Simple microphone preamplifier -  . . . 

 

Toward More-Compact Digital Microphones -  Analog Devices-Analog Dialogue. . .  [by Furst, Claus and Nielsen, Jannik]

 

Wireless microphone -  Schematic only, no circuit description. . .  [Designer's name not given]

 

Wireless Microphone -  Circuit & notes only, no circuit description given. . . .  [Tony van Roon's circuit]

 

Wireless Microphone -  Schematic only, no circuit description included. . .  [designer's name not included]

 

wireless microphone transmitter -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

 

 


Wireless Microphone Circuits


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.