FM Wireless Mike:  low power frequency modulated transmitter using two transistors. The circuit works with 9v power supply. . (Circuit added 9/04)

Interfacing Microphones to Computer Sound Cards:  (Electronic Schematic / circuit added 4/02)

JT-16 a Improves Performance of Ssm2017 MIC Preamp Ic:  (Circuit / schematic design added 6/06)

JT-MB C Isolates Both MIC and Line Inputs of Inexpensive Mixer:  (Circuit / schematic design added 6/06)

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.  (added 2/06)

Low Impedance Microphone Amplifier #1:  (Circuit / schematic design added 6/06)

Low Noise Balanced Microphone Preamp:  very low noise, close to the theoretical 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)

Low Noise Microphone PreAmplifier:  (added 9/02)

Micro Spy with FETs:  (Electronic Schematic / circuit added 4/02)

Micro Spy with TTL:  (Electronic Schematic / circuit added 4/02)

Micro Spy with USW:  (Electronic Schematic / circuit added 4/02)

Microphone Circuit Test Oscillator:  (Electronic circuit added 7/03)

Microphone Mixer:  Designed for3-dynamic microphones (Electronic Schematic / circuit added 4/02)

Microphone Phantom Power Supply:  (Electronic circuit added 7/03)

Microphone Polarity Tester:  (Electronic Schematic / circuit added 4/02)

Microphone Preamp #2:  (circuit / schematic added 2/03)

Microphone Preamp:  Very simple two transistor circuit (Electronic circuit added 5/02)

Microphone PreAmplifier #2:  This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements). The idea of this circuit is to keep the design as simple as possible to be easy to build. That was my goal when I needed a simple external microphone preamplifier for my mixer. The performance of the circuit is nothing superior but can be used with many not so serious projects....  (Electronic circuit added 4/05)

microphone PreAmplifier #3:  (Electronic Schematic / circuit added 4/02)

Microphone PreAmplifier:  (Electronic circuit added 4/05)

Microphone uses phantom Power:  08/30/01 EDN Design Ideas  /  (added 1/05)  The electret microphone capsule is similar to those commonly used in telephones, cassette recorders, and computers. The element functions as a capacitor with a fixed trapped charge. Sound pressure moves a diaphragm, producing variations in the capacitance. This action produces an ac-output voltage with an extremely high source impedance. ..

Mike Pads and Other Small Gadgets:  Includes Active Direct Box circuit (Electronic circuit added 5/02)

Miniature FM Spy Mic:  This spy mic works from single 1.5 volts AA type battery cell. It is highly sensitive and has a range of 300 meters. You can use any HF transistor with cut-off freq. >300 MHz for Q. Use electret mic.   (added 11/05)

Miniature FM Transmitter #1:  (Electronic Schematic / circuit added 4/02)

Miniature FM Transmitter #2:  (Electronic Schematic / circuit added 4/02)

Miniature FM Transmitter #3:  (Electronic Schematic / circuit added 4/02)

Miniature FM Transmitter:  (Electronic circuit added 4/05)

Miniature FM Transmitters #4:  (added 5/03)

Modification of Panasonic Backelectret Capacitor Microphone (WM GOAT Digikey P9967 ND):  This drawing describes the conventional hookup and option where FET is connected as source follower with3 wires to preamp. (Circuit / schematic design added 6/06)

MS 2 MIC Splitter:  Send signal from1-microph1-to two mixers, product datasheet with circuit diagram in PDF format (Electronic circuit added 5/02)

MS Stereo Microphone:  (Circuit / schematic design added 6/06)