Category: Switching and Controlling

Various type of dimmer circuit is already available online, and the idea of lamp dimmer is not new to electronics hobbyist. This light dimmer circuit is very efficient because no power is dissipated in the resistive elements. In SCR light dimmers the firing angle is controlled as a result of which the waveform is distorted. But it is not so with this circuit. The load in this case always works with sine wave irrespective of power delivered to the load or the type of load. The brightness of the lamp…

We have already posted a dimmer using a capacitor called “Light Dimmer Circuit“. Now here is a Touch dimmer circuit using triac. Circuit Description of Touch Dimmer Circuit Using Triacs The heart of the circuit touch dimmer using triac is the S576 (IC1) which provides an uncomplicated and elegant method to fire the triac. The IC is not very sensitive to power glitches and works on the 15V dropped by R2 and C2, Zener Diode ZD1 clamps the voltage at 15V, while D1 and C3 smoothen the supply. Interference is…

The circuit for the clap switch is not a new idea for electronics hobbyists. After a long experiment here we design and verified a simple clap switch circuit. Description of Clap Switch Circuit The circuit presented here “Clap Switch” consists of a silicon transistor and is divided into three main sections i.e, Audio trigger stage Bistable multivibrator stage Relay operation stage The audio trigger stage is built around a microphone and transistor T1. Microphone changes the sound of a clap in electrical signal and is given to the base of…

Nowadays, commercially available washing machines are provided with features like the auto-off timer, reversible impeller, etc. Most of them have mechanical timers, reverses, etc. Some are equipped with electronic timers. But they are very expensive and out of reach of the average consumer. Electronic Washing Machine Control circuit provides all the facilities provided by reputed companies and even more. The circuit has a timer circuit that can be set to any duration from 0 to 15 minutes and can be extended to any length of time by merely changing a…

If you want to control an electrical appliance from two places then you use the 2-way switch. But to control it from more than two locations (like operating a hotel’s staircase light from individual floors from various locations), the circuit “Staircase Switch” comes to your help. Due to the small size of the staircase switch circuit, it can be installed within a junction box. Circuit Description of Staircase Switch Circuit Staircase Switch Circuit utilize IC1 (NE555) as a timer with timing of 0.7 seconds, for this it is configured in…

The circuit described here is a Priority Lamp Circuit which gives priority in switching. Switches SW1 to SW4 is a push-to-off type or push-button type, as desired. Normally, pushing off any switch will turn ‘on’ the corresponding relay, i.e. pushing of SW1 enables the NPN transistor T1, and hence relay RL1 operates. The logic section of is designed to get a controlled high output. The pressing of one switch disables the operation of all switches and results in priority in switching. In normal cases, all switches are closed and all relays…

This project “Staircase Light  Switch Circuit” may be used where it is necessary to control a single light or device by switches situated at different places. The control of a staircase light switch circuit is one of the applications of a light switch circuit. Staircase Light switch circuit can also be used to control an outdoor light using switches situated both inside and outside of the house. Any number of switches may be connected to the light switch circuit. As the switches are wired in parallel, the wiring can be…