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Wireless Microphone Circuits
Last Updated on: Thursday, October 30, 2014 09:22 AM


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

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]
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….
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....(schematic / circuit added 4/08)
FM Transmitter-Miniature -  (circuit / schematic added 5/03)
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......
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 Description contains theory of operation, construction tips, and some testing procedures. (Circuit design added 10/06)
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 -  (electronic diagram added 6/03)
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. Sherby]
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......
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]
Wireless microphone -  Schematic only, no circuit description
Wireless Microphone -  Circuit & notes only, no circuit description given…. [Tony van Roon's circuit]
wireless microphone transmitter -  ….(design added 04/09) [Peter Jakab, Electrical Engineer, Engineer of Informatics]

Wireless Microphone Circuits


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