Microphone preamplifiers ( 64 ) :

• 2-wire Remot Microphone Amplifier - uses special amplifier module from   
• A High Performance Transformer-Coupled Microphone Preamplifier   
• A Low Noise Microphone Preamp with Phantom Power Option   
• Amplified Ear - Useful to listen in faint sounds 1.5V Battery operation, includes electret microphone preamplifier which runs from 1.5V DC and can directly drive 32 Ohms impedance mini-earphones   
• A Vacuum Tube Microphone Preamp / Direct Box Project - from January 1997 EQ Column, includes   
• Balanced mic/line amp with TUBES - uses two 12AU7 tubes in a class-A cathode-driven input stage, followed by a class-AB1 cathode follower output stage, 6db gain, requires 90VDC and 12VDC   
• Balanced Microphone Preamplifier - A single-channel, balanced in/out preamplifier with 48V phantom power, rumble filter and low rolloff filter   
• Balanced Microphone Preamp Project - simple preamplifier with phantom power   
• Balanced Low Noise Microphone Preamplifier Design - ADI AN-115 (pdf, 78,935 bytes)   
• Condenser microphone hookup   
• DIY Speaker Testing Microphone Preamp   
• Dual Phantom Power Microphone Preamplifier - information and full schematic of a kit available from   
• ECM Mic Preamplifier - low noise electret microphone preamplifier   
• Electric Crayons, Anyone? (A Vacuum Tube Microphone Preamp / Direct Box Project) - published in January97 EQ Column   
• IC mic preamp uses Jensen Twin-Servo topology   
• Intercom preamp - a convenient way of making an intercom is to use a loudspeaker as a microphone   
• Jensen Transformers Application Schematics - includes many microphone preamplifier related circuits   
• JT-13K6-C in Simple One IC Stage Mic Preamp - 15KB PDF   
• Kondensaattorimikrofonin esivahvistin - simple preamplifier for electret microphone, text in Finnish   
• 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. This circuit can be also adapted for higher impedance microphones (instructions for this are given).   
• 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   
• Low Noise Microphone Preamplifier   
• Mic-Pre Pan Pot Circuit   
• Microphone preamp - very simple two transistor circuit   
• Mu Stage Tube Mic Pre - microphone preamp based on a Jensen transformer and an Alan Kimmel designed "Mu-mode" gain stage   
• PAiA Tube Mic Preamp    Rate this link
• Portable Microphone Preamplifier - 9V battery powered high headroom input circuitry   
• Preamp for low-Z microphones - This is a low input impedance, high quality pre-amplifier of the sort that could be used in a stage mixing desk. This circuit is built using diescrete transistors and uses a dual rail power supply.   
• Rane MS 1b microphone preamplifier circuit diagram - This is a circuit diagram of a commercial high quality balanced microphone preamplifier. This document is in pdf format.   
• Simple microphone preamplifier - simple one transistor circuit   
• Standard Microphone Preamplifier Input Circuitry - pdf file   
• Taos Amp Solid State Mic Preamp - simple transformerless microphone preamp, includes circuit board design    Rate this link
• Vintage Neve Class A Circuit Information - Neve BA283AV Class A Preamaplifier Circuit   

Building microphone

• Boundary-layer dish microphone - ideas for a directional microphone assembly   
• Build a Microphone plug - You only need a 3.5 mm plug (mono) and a very small microphone which is soldered directly onto the contacts of the plug and fits in its housing to build this small microphone for Zaurus palmtop computer.   
• Build a pair of binaural microphones   
• Build These Noise-Canceling Headphones - plus Binaural Microphone Headset, Audio Probe, and Parabolic Microphone   
• Computer Microphone - adapting electret microphone to soundcards with dynamic microphone inputs   
• DAT-Heads Digest #195 - many electret microphone wiring tips   
• DIY microphone for Sony MD R35 minidisc recorder - simple electret microphone   
• Electret MIC Apps - an electret MIC is the best value for money omnidirectional microphone you can buy for 90% of microphone application   
• Electret microphone connection - how to connect electret microphone   
• Electret microphone powering circuits   
• High-voltage circuits for electrostatic microphones   
• Homemade Binaural Mics   
• Inductive pickup - simple device for detecting audio-frequency electromagnetic signals, such as those emanating from a loudspeaker, or it's cable   
• Interfacing Microphones to Computer Sound Cards   
• JT-MB-D Passive Stereo Matrix for M-S Mic Technique   
• JT-MB-C Used to "Phantom" Power the Realistic PZM Mic   
• Making a rugged, connectorized microphone from a Panasonic microphone capsule   
• Microphone uses "phantom power" - Phantom-powered microphones derive power for their active circuitry from the receiving-end circuit through the same leads that transmit the audio signal. This design uses this "phantom power" for the electret microphone capsule and a small preamplifier fitted inside microphone.   
• Modification of Panasonic backelectret capacitor microphone (WM-GOAT - DigiKey P9967-ND) - This drawing describes the conventional hookup and option where FET is connected as slource follower with 3 wires to preamp.   
• PAiA MS Microphone   
• Radio Shack Pressure Zone Microphone (PZM) Modifications - This articel gives instructionf for better power supply circuit and also other ideas.   
• Schematics of old tube mics   
• Sony C-37A Condenser Microphone - information with circuit diagram   
• Speaker Microphone - circuit that allows you to use a cheap loudspeaker as a poor microphone
• Taos Amp Stereo Bar - how to build special microphone holder for two microphones for near coincident stereo techniques   
• Telefunken (Neumann) U47 FET Retrofit - replacing amplifier tube with FET   
• To use a Speaker as a Mike - Using this circuit will give a reasonable output signal to drive an amplifier. The Speaker can be any size or even two in series.   

Microphone accessories

• Couch Drop: Momentary on/off floor switch for microphones - data sheet with circuit diagram in pdf format, includes no-pop mute function   
• Cough Drop Momentary Muting Switch - This is a product data sheet with circuit diagram in pdf format. This circuit has no-pop mute function.   
• Phantom Power Supply Circuit - Here is a simple phantom power supply that uses a voltage doubler circuit so that a commonly available low voltage transformer (such as a Radio Shack 273-1366A) can be used to produce 48 to 52 Volts DC.   
• Pop free Microphone on/off switch - 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.   

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