doorphone intercom circuits using la4100 la4101 la4102

This circuit diagram illustrates a fully transistorized inverter capable of driving loads of up to 60W. Transistors Q1 and Q2 create a 50Hz astable multivibrator. The output from the collector of Q2 connects to the input of a Darlington...

An 8-ohm speaker functions as both a microphone and an output device. The BC109C transistor operates in common base mode, providing substantial voltage gain while ensuring a low impedance input suitable for the speaker. Self DC biasing is implemented...

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This DTMF (Dual Tone Multi Frequency) decoder circuit identifies the dial tone from the telephone line and decodes the key pressed on the remote telephone. For the detection of DTMF signaling, the IC MT8870DE, a touch tone decoder IC,...

This multi-purpose amplifier utilizes the TDA2030 chip. It has a power output of 8 watts (RMS) when driving 8-ohm loudspeakers. The amplifier features low noise and a valuable Total Harmonic Distortion (THD) specification. The TDA2030 is a popular integrated circuit...

This game can be played individually or with friends. The circuit consists of a timer IC, two decade counters, and a display driver paired with a 7-segment display. The objective of the game is straightforward: the player who reaches...