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Electronic Circuits

Free Electronic Circuits, Schematics and circuit diagrams. This section of EG Labs brings you new & latest electronics circuits and schematics. These hobby circuit ideas are described with the circuit diagram, description and components used in the circuit.
Latest Electronic Circuits

Some of the circuits require zero cross reference mark of applied AC waveform as an input for their operation. The circuit will produce output based on these zero marks. The output is either a short positive or negative pulse when AC wave crosses zero line. For example in thyristor phase angle control circuit, zero cross reference mark of AC supply waveform is required to trigger thyristor at a specific angle. The phase difference measurement circuit will take zero cross mark inputs of two different AC waveforms and calculates phase difference between these two waveforms. Refer the waveforms given in following figure to understand above two examples better.

Many devices require input pulses for their operation. Some device requires continuous train of pulses some requires single pulse. In some of the devices there is a provision to alter between continuous pulses and single pulse. For example a stepper motor controller can have two operating modes – auto and manual. In auto mode it requires continuous pulses to rotate motor continuously while in manual mode it requires single pulse to be generated when button is pressed manually.

The circuit presented here is 2 in 1 circuit that generates low frequency pulses in the output. It has two operating modes. In auto mode it generates pulses continuously and in manual mode it generates pulse when push button is pressed. The circuit is built using single IC555. To generate continuous pulses it is configured in astable mode and to generate single pulse it is configured in monostable mode. 

Here we have presented a simple circuit using which you can convert IR signal into RF signals and at the same time transmit this to remote location and decode them using a compatible RF receiver. With help of this circuit you can increase the range of the device you are controlling up to 200 meters


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