Presented here is a PWM amplifier circuit (Figure 1) built around a two quadrant driver circuit that can amplify 3.3V or 5V signals to a higher level. Figure 1 PWM amplifier circuit built around a two ...

This infrared transmitter use PWM (pulse width modulation). The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to ...

PWM output OCRA of the Arduino Uno forms the input to the circuit (Fig. 1), with the output connected to the interrupt pin INT0.

Because it uses only six components, this circuit can be very cost effective. The LM431 can be purchased for as low as 10 cents in single-unit quantities, well below that of any op amp. Editor’s ...