Free Simple Circuit Diagram
Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We don’t call the tone of audio signal as red, green or or blue, but we can classify them as bass, mid, and treble. In general, tone control has no mid frequency control, […]
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This intercom circuit suitable for accompanying door bell. This circuit uses the speakers both as microphones and as loudspeaker. This intercom is made simple by using only a single amplifier IC LM390 to serve two-way communication. This circuit is based on master controlled half-duplex operation. With LM390, a 6V battery supply would produce loud enough volume. Here is the schematic […]
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This is a circuit of High-Q Notch Filter. This circuit consist of LM102 and a twin “T” network. Twin T network sum two signal from different path with different phase shift. At certain frequency, the phase shift will be 180 degrees. The sum will produce zero output since one signal is the inverse of other signal, in other words, the […]
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This schematic diagram below show a circuit of VOX Box (voice-operated switch). This circuit consist of a Schmitt trigger, a relay driver, and microphone preamplifier. The microphone preamplifier(U1) receive input signal which will be amplified. THRESHOLD control (R8) is fed by the amplified signal. The trigger’s output goes high when the preselected threshold voltage level is exceeded. Here is the […]
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