Category «Audio»

Compact 3W BTL Audio Power Amplifier TDA7056

Bridge-tied-load (BTL) configuration in an amplifier is basically a H-network  with the loud-speaker as the “bridge” between two active valve or switcher. This configuration allow a full alternating current signal to be produced at the load (loudspeaker) without a transformer or a symmetric power supply.  Using integrated circuit, such BTL circuitry is presented in a …

Binaural Synthesizer/Mono to Stereo Converter for Small Speaker/Phones

This simple circuit can be used to drive two high-impedance loudspeakers or stereo phones, taking monophonic input (one channel),  to produce a stereo signal which spread along the midway between loudspeakers when the input signal contain many frequency components. This circuit has two channels, left and right, right channel has high-pass active filter and left …

Loud 10-W Car Alarm Siren

By generating square-wave output that sweeps down and up in frequency, this circuit can produce force field of high-intensity sound inside car. This circuit can make a car thieve panics and decide to run before anyone catch his action. D1, C1 and R1 produce triangle waveform by shaping a square wave output of IC1.  If …