Electronic Ear

Circuit below is a very sensitive 3-transistor amplifier using a speaker transformer. This can be wound on a short length of ferrite rod as show above or 150 turns on a 10mH choke. The biasing of the middle transistor is set for 3 V supply. During idle conditions and the quiescent current is just 5mA, the second and third transistors […]

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6 Band Graphic Equalizer

The circuit diagram below shows a circuit of graphic equalizer 6 band of regulation. The potentiometer RV1-6 regulates each band, and the sliding type is the recommended for better visual indication. . The gain is null (flat) in the center position of potentiometer, but in the maximum and minimum position has +/- 15 dB, boost or cutting off, respectively. It […]

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