Jap's electronic projects

Low impedance microphone amplifier

description

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. In this case, you should directly connect the signal to C7.

Schematic diagram

Layout of board

printed PCB

components

posted by tom on 2001-08-04 02:55 I have a WatsonLinc 752 induction microphone that clamps around a telephone transmission line. I have hooking that into a small 7 watt fm transmitter. I need an amplifier for the microphone that runs off the same power supply as the transmitter: 12V 3Amp. This is for a clandestine operation and discretion is expected. I am willing to pay a reasonable price for something reliable. email me: tomdavis61@yahoo.com

posted by Mátyás Halmi on 2001-06-28 15:11 I will probe this micamp circuit! Bye!

posted by ricki on 2001-05-06 18:04 can u please design me a low power amplifier,near 9volts that will power a 300 watt speaker thanx

posted by cinar on 2001-03-05 20:33 veri good

posted by roy on 2000-01-13 13:20 yes another ? can you design ame a schematic of something that counts down like to zero and display a message at the end

posted by roy on 2000-01-13 12:52 is there a way to build a traffic light device to change the lights if so can you show me how to build one with a schematic. right now i'm in school for electronics i just want to know if it works like in the movies. thanks roy

posted by Tim on 1999-11-04 06:15 Hey, Im a student at the southern alberta instute of tech., in electronics engineering. I have to build a final project, a working device of some kind. I would like to know if it is possible to use some of your circuits. Also, if possible, are there any laser? what are your recommendatons? or