Sine Wave to Square Wave Converter Circuit Design

This sine wave to square wave converter circuit is expected to provide good square waves changing a sine wave delivered from an existing generator. Its primary feature consists in the fact that no power-source is required: in this manner it can be simply connected between a sine wave generator and Read more…


PWM DC Motor Controller with MOSFET Schematic

This is the simple and low cost pulse width modulation – PWM DC motor controller using a MOSFET. This kind connection for DC motor control is to prevent heat and minimize the power consumption. It controls the motor speed by driving the motor with short pulses. These pulses vary in Read more…


Simple Low Cost Mosquito Repellent Circuit Design

Here is the simple and low cost mosquito repellent circuit design. The circuit serves to keep the mosquitoes out of the room or the location where the device is installed. According to certain publications, the frequency emitted by the male mosquitoes is said to be around 20–25 kHz, and so Read more…


6V and 12V Car Battery Charger Circuit Design

This 6V and 12V car battery charger circuit can be automatically charged, quickly and correctly, 6V and 12V batteries. Circuit design is divided into two series of modules that are: power supply module and the main charger module containing the regulator modules and direct current amplifier module.


Here is the DIY electronic cardlock security system that can be used as a lock to turn on dan turn off important electronic/electrical appliances. When card is inserted, depending upon the position of punched hole on the card, a particular appliance would be switched on. The card should be rectangular Read more…


Vibration Sensor Alarm Circuit Design

Here the circuit design of vibration sensor alarm. Initially, when power switch S1 is flipped to “on” position, power indicator LED1 lights up immediately. IC LM555 (IC1), wired as a simple latch circuit with control input, is powered and R-C components R4 and C5 connected at its reset pin 4 Read more…


Protector for Electronic Appliance with Three-Phase Power

This is the circuit design of the protector for electronic appliance with three-phase power supply. Many of electronic appliances need three-phase AC supply to work. If there is any failure of any of the phases, then it will make the appliance prone to erratic functioning and may even lead to Read more…


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