Category «Control and Monitoring»

Separate ON-OFF Touch Switch

This schematic diagram is about touch switch circuit.  Separate ON and OFF switch improves the ergonomics for safety, since the touching off button when the state is off doesn’t make the system acts in the opposite way: turning ON the system. This accident usually happens when we make wrong assumption of the current state about …

Simple LDR Light Alarm

This is a light alarm circuit. This circuit uses Light dependent resistor (LDR). When there is no light fall on the LDR, the transistor driving the speaker is not turned on, because its resistance is high. When the LDR receives light, its resistance decreases and the collector of the second transistor falls. The first transistor …

Clap Triggered Switch

This is circuit of Clap Triggered Switch. When the circuit detects tap, or short whistle or a clap, this circuit will toggle the LEDs. 33k and 5K6 charge The second 10u. The negative excursion of the waveform takes the positive end of the 10u towards the 0v rail, when a sound is detected. the two …

PID Controller Using Op-Amp

Generally, specifically combined ICs perform a control task. We can carry out simple controls using analog ICs, such as operational amplifier circuitry. The basic component of “Control Electronics” is an integrated circuit (IC). IC is a small electronic device made out of a semiconductor material. According to equation 1, this analog circuit calculates PID control …

Motor-Speed Control Employs Class-D Power Amplifier

A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins and they enhance battery life. Those features make this device an ideal candidate for controlling speed and direction in small electric motors. The standard application circuit for a class D …