Category: Switching and Controlling

Sound Operated Light and Alarm Circuit

Engineeering Projects
circuit diagram of sound operated light and alarm

Various types of security-based projects are already available on bestengineeringprojects.com. Now here is sound operated light and alarm that is used as an intruder alarm, activated when any sound is detected (like the opening of doors, knocking, or door opening) and starts flashing with a sound that alerts you of an intruder. After the second sound pulse is turned off. Circuit Description of Sound Operated Light and Alarm The circuit of sound-operated light and alarm is designed using a pair of timer IC (NE555), a dual JK flip flop IC…

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Touch Switch-Cum-Heat Operated Switch

Engineeering Projects
circuit diagram of touch switch cum heat operated switch

We are updating day by day with different projects. Now, here we are going to post a very simple project using a few active as well as passive components called dual switches. As its name, it can be used as a touch switch as well as heat operated switch. Thus, we are calling it Touch Switch Cum Heat Operated Switch Circuit Description Touch Switch Cum Heat Operated Switch The circuit of the touch switch cum heat operated switch is very simple and easily understandable. It comprises three general-purpose transistors. The…

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Clap Switch Cum Touch Switch

Engineeering Projects
circuit diagram of clap switch cum touch operated switch

Various Switching circuits including clap switch, touch witch heat switch is already posted. Now, here is two in one switching circuit i.e. clap switch cum touch switch with a facility of timer. Circuit Description Clap Switch Cum Touch Switch This circuit uses a timer IC NE555 (IC2) and audio amplifier IC TBA810 (IC1). TBA810 is a 7-watt audio amplifier IC which is used to amplify the audio signal coupled from audio transformer X1. Here we used a loudspeaker as a sound sensor. The audio transformer of 3 volts is connected…

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Sound Operated Relay Using Transistors

Engineeering Projects
circuit diagram of sound operated relay

Various type of switching circuit like a touch-operated relay, light operated relay, heat operated relay is already posted in bestengineeringprojects.com. Now here is another simple electronic project in the series of switching circuits called sound-operated relays. Circuit Description of Sound Operated Relay using Transistors The circuit of sound operated relay is self-explanatory and is very easy to understand. This circuit is built around a 2-stage audio amplifier using PNP transistors. The sound sensor of the circuit sound-operated relay is done by 8Ω loudspeakers. The output of the loudspeaker is given…

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Photoelectric switch using ne555

Engineeering Projects
circuit diagram of photoelectric switch using 555

This circuit is of a highly sensitive photoelectric switch using NE555 timer IC. When the LDR1 is kept in light, the switch remains off, but when the light source is removed, the controller circuit gets switched on. This switch has vast application. With little modification, it can be used as a burglar alarm, a corridor visitors monitor, an automatic street lighting system, and as an automatic water tap system. Circuit Description of | Photoelectric switch using NE555 The NE555 timer functions here as a Schmitt trigger. A NE555 IC comprises two…

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Light Operated lamp switch using DIAC and TRIAC

Engineeering Projects
light operated on off switch without ic

Various electronic projects using LDR (Light Operated Resistor) are already posted on bestengineeringprojects.com. Now, here is another simple project using LDR called a light-operated lamp switch using DIAC and TRIAC. This circuit utilizes very few components and is so simple that anyone can understand it. Circuit Description of Light Operated Lamp Switch: The circuit of light operated lamp switch utilizes a diac and a triac as semiconductors and LDR as a sensor. LDR is a type of variable resistor that changes its value according to the intensity of light falling…

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Sound Operated On-Off Switch

Engineeering Projects
circuit diagram of electronic clapper

Various remote control-based projects are already posted on bestengineeringprojects.com. Now here is a unique remote control circuit called a sound operated on-off switch and it responds only particular frequency of sound (4.5 kHz) and can control the device from a distance of up to 4.6 meters (15 feet). Most sound-operated switches use clap sound or voice to activate the remote control. Tone frequency generated by clapping or a voice control is not constant and designing a receiver circuit for a particular or ordinary clap or voice is very difficult. To…

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Thermal Touch Switch using op-amp 741

Engineeering Projects
thermal touch switch using op amp 741

Various types of switch circuits like a light operated switch, sound operated switch, etc is already posted on www.bestengineeringprojects.com. Now here is a thermal touch switch that automatic on and off due to the increase and decrease of pre-defined temperature. This type of circuit is useful to operate fans, cooler, etc. Circuit description of thermal touch switch using operational amplifier 741 The circuit comprises an operational amplifier IC (IC1), silicon diode (D1 and D2), and a few passive components to complete the circuit. Diode D1 is used here as a…

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DC Motor Control Circuit

Engineeering Projects
circuit diagram of dc motor controlling using single switch

The various motor control circuit is already available on the internet and this is also not a new idea for the electronics hobbyist. The circuit of the DC Motor Control Circuit, published here is different from another circuit available for motor control because it let you run a DC motor in a clockwise or anti-clockwise direction and stop it using a single switch. DC motor control circuit has also another advantage i.e. for proper operation of the motor this circuit provides a constant voltage. Here we use three LEDs LED1…

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Dome Lamp Dimmer Circuit

Engineeering Projects
circuit diagram of dome lamp dimmer

As we have already published various types of lamp dimmer like Light Dimmer Circuit using Capacitor and Touch Dimmer Circuit using triac etc. Now here is a lamp dimmer for the dome lamp in the car, which gives a fairly linear control over the lamp brightness from low to high intensity. The main advantage of the project dome lamp dimmer circuit is it consumes little power because it is a pulse-width modulated chopper circuit. You can also control the intensity of a halogen bulb or control the speed of a…

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