I was looking for a simple per-amplifier circuit. Found one at http://www.minidisc.org/mic_preamp/Simple%20Stereo%20Electret%20Mic%20Preamp.htm. I made minor modifications and here is my version.
Recently I created a soldering station based on Arduino Pro mini. It has to read temperature data from a thermocouple within the soldering iron. Thermocouple produces a very little voltage, around up to 30 Milli volts for soldering irons. So, the soldering station uses an op-amp based circuit to amplify those small signals from the… Continue reading Thermocouple Amplifier with OP07C Op-Amp