Circuit diagrams and schematics - Electronic projects

The circuit given below is a simple audio-amplifier powered from a 9v battery. The first two transistors are a voltage amplifier, and the right-hand pair form a complementary output pair. The two diodes between the bases of the output transistors give the required bias, but if the output devices ever draw too much current (or [...]

Watch The Audio Levels! How loud is the audio at the concert? What’s the level of your stereo? Exactly how loud is that train that runs by your house? This little pocket Vu meter will tell you in a flash! The LED bar graph shows you the ambient room audio level using high sensitivity built-in [...]

Expensive stereo is general often have VU meter come to and for help show max power the stereo not too much. For radio tape general plaything has will no VU Meter. I then think to seek Multi meter use can replace. By use Range 100uA and electronics equipment the other again. It have be Potentiometer [...]