The simple transistor based non contact AC mains tester circuit will allow you to test the presence of mains AC hum from a distance of about 3 inches. The LED […]
Single chip Quadraphonic Amplifier Circuit – For Making Home theater Systems
In this post we learn how to make a simple single chip quadraphonic amplifier circuit which can drive four loudspeakers through 4 separate input channels, this IC becomes ideally suitable […]
Digital Temperature Indicator Circuit
This explained digital temperature indicator circuit had been created for computing the heatsink temperature of a big over 1kva power amplifiers, however it may, obviously, be applied for other power […]
Transistor Current Gain Tester Circuit – hFE Tester
This hFE or transistor forward gain tester is intriguing due to its ease-of-use and because it allows the use of both PNP and NPN transistors to be assessed. Additionally more […]
Simple Microphone (MIC) Amplifier Circuits
The first one is a single transistor simple microphone circuit, very simple to hook up using an electret microphone or MIC and an audio amplifier. Typically the 10K resistor within […]
Simple 220V Ding Dong Bell Circuit
The post explains how to make a simple 220V mains operated ding dong bell circuit which will generate a powerful ding dong sound each time someone presses the bell push […]