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


Last Updated: December 29, 2017 03:15 AM

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ECM Mic Preamplifier - A microphone amplifier that may be used with either Electret Condenser Microphone  (ECM) inserts or dynamic inserts, made with discrete components.   __ Designed by Andy Collison

Electret mic Amplifier - The Elecraft XG2 is a crystal oscillator with accurate 1 V and 50 V output levels.  It's
ideal for receiver test and alignment.  The 1-V output can be used to measure a receiver's
sensitivity, while the 50-V output is useful for S-meter calibration.  Switch-selected
output frequencies of 3579, 7040, and 14060 kHz provide convenient test signals on 80,
40, and 20 meters; harmonics of these frequencies can be used for measurements on
higher bands __ Designed by Andy Wilson

Electret Microphone Connection - how to connect electret microphone __ Designed by Tomi Engdahl

Electret Microphone Powering - This document is a collection of information and circuits for powering electret microphone capsules.  This document is written for people who understand the basics of microhone circuits. __ Designed by Tomi Engdahl

Fitting a Wireless Microphone to the PortaPAL - Here's how to fit a pro-quality wireless mic to the PortaPAL to make it truly portable.__ SiliconChip

FM Bug - This FM bug transmitter circuit will let you spy on people.  The transmitter can be placed in the desired room and the conversation heard from a place far away just using...__ Electronics Projects for You

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 __ Designed by Harry Lythall-SM0VPO

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.   __ Designed by Jose Pino

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 __ Contact: Charles Wenzel of Wenzel Associates, Inc.

FM Transmitter - 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! __ Designed by Tony van Roon  VA3AVR

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 __ Designed by Andy Wilson

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,  __ Designed by Tony van Roon  VA3AVR

FM Wireless Mike - Low power frequency modulated transmitter using two transistors.  The circuit works with 9v power supply

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

High Performance Analog MEMS Microphone's Simple Circuit Interface to SigmaDSP Audio Codec - From this point, follow the documentation for the EVAL-ADAU1761Z regarding software installation, setup, and operation of the system.  The SigmaStudio software is used to program and tune the registers and SigmaDSP core in the ADAU1761__ Analog Devices from the Lab

High Performance Digital MEMS Microphone Standard Digital Audio Interface to Blackfin DSP - These boards are designed to work together and include code to enable the digital audio connection__ Analog Devices from the Lab

High Power FM Wireless Microphone - This FM Wireless Microphone has been a very popular project with beginners and experienced constructors alike.  It has been used inside guitars and as the basis of a remote control system.  I do however, receive many requests for a higher powered circuit and better microphone sensitivity.  This High Power FM Wireless Microphone has a better frequency stability, over 1 Km range and is good on microphone sensitivity.  This has been achieved by adding an RF amplifier buffer  (with 10dB gain) and an AF preamplifier to boost the modulation a little.

High-Performance Microphone Preamplifier - Some recording devices, especially computer sound cards, have poor sound quality or insufficient gain when used with certain microphones.  This tiny module provides a line level output from an unbalanced or balanced microphone and has very low noise and distortion.  It runs off 5-20V DC, consuming just 6mA.__ SiliconChip

Home Brew a Condenser Mike - Electret condenser microphones have truly come of age in recent years.  No longer are they as temperature sensitive as in the past and they have found their way into many modern amateur transceivers.  An inexpensive condenser microphone with excellent performance can be easily constructed with easily available parts __ Designed by Radio Amateur Society of Norwich

Interfacing Microphones to Computer Sound Cards - AN047-P:  InterfaceLVDS: Interfacing LVDS to PECL; LVPECL; CML; RS-4422 ans Signal-ended Devices

JFET Mike Preamp using Jensen JE16 Input Transformer - Schematic Only __ Contact: info @ forsselltech . com

Lapel microphone adaptor for PA systems - Simple adaptor features a balanceed output and lets you use electret lapel and headset microphones with PA systems.__ SiliconChip

LF071 Mic Amplifier - A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones.  The op-amp used can be any low noise, high performance type, e.  g.  NE5534, TL071, OPA 371 etc __ Designed by Andy Collison

Line level Signal to microphone input adapter - Sometimes there is need to convert line level signals to such signal that it can be connected to microphone input.  Because the line level signals are typically in range of 0.5.2V and the microphone signals are in millivolt range, quite much attenuation is needed to match the signal levels.  This means that typically you will need 40-50 dB of attenuation __ Designed by Tomi Engdahl

Low impedance microphone Amplifier - The circuit is a microphone amplifier for use with low impedance  (~200 ohm) microphones.  It will work with stabilized voltages between 6-30VDC.  If you don't build the impedance adapter part with T1, you get a micamp for higher impedance microphones.   __ Designed by Peter Jakab

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

Low Noise Microphone PreAmplifier - This is a design for a low noise microphone preamplifier, which is ideally suited to low impedance  (600 Ohm nominal) microphones.  One limitation is that it is not balanced, which is not a problem in a home recording environment, but will allow the mic lead  (and case) to pick up noise with long cable runs or in a hostile environment.   __ Designed by Rod Elliott  ESP

Low Voltage Microphone Preamplifier - This is a low voltage microphone preamplifier circuit with a 1.5V power supply.  The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100.  Its output is fed through a gain-control potentiometer to the op amp, which is connected for a gain of 10.  The combination gives a 60 dB gain with a __ Designed by Popescu Marian

Low voltage microphone preamplifier using LM10 - Circuit Only

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

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