Mosquito Repeller Circuit

circuit diagram of mosquito repeller

Here is a simple circuit called mosquito repeller in the series of easy electronic project. The circuit of mosquito repeller uses few passive components. Circuit Description and Working Principle of Mosquito Repeller Circuit: The circuit of mosquito repeller is so simple that any-one can understand. The input of 220 volt AC from mains is directly given to the circuit; two resistors are connected in parallel as current divider circuit. Neon lamp is used as indicator to check whether the circuit works properly or not. An aluminum plate is connected to…

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Disco Light Circuit

circuit diagram of disco light

Blinking and shimmering of lights in disco keep everyone amazed, the entire design cost of which might seem high. A circuit is presented hereby is of disco light making use of low-cost CMOS chip CD4011B, which is a two-input quad NAND gate. Along with two particular gates; G1 and G2 as shown in the figure below, it works as an RC oscillator forming clock oscillator gates. Circuit Description of Disco Light Circuit Here the two input terminals of the CMOS chip are coupled together to form an inverter. And, again…

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Touch Switch-Cum-Heat Operated Switch

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

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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Bass Booster Circuit using Op-Amp 741 IC

bass booster circuit design

Here is one another basic project call bass booster using op-amp 741 IC. The circuit bass booster increases beat frequency without affecting high frequency. Description of Bass Booster Circuit using Op-Amp 741 IC The circuit of bass booster shown in figure 1 is divided into two main section i.e. bypass high frequency and boost section. The input of this circuit is connected to the output of pre-amplifier circuit and it’s output to input of power amplifier circuit. When audio signal is given to the input, high frequency is passed through…

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DIY Headphone Amplifier using 741 IC

circuit diagram of DIY headphone amplifier

Various type of amplifier and pre-amplifier circuit has appeared in this website in amplifier and pre-amplifier section. The circuit posted here is of DIY headphone amplifier which is suitable for headphone or 8-ohm speaker or more impedance. The circuit is so designed that it has no risk of overloading or distortion of either the circuit or headphone. Circuit Description DIY Headphone Amplifier using 741 IC The heart of the circuit headphone amplifier is op-amp 741 which provide suitable gain where the transistor T1 and T2 are used to drive low…

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Electronic Thermometer Circuit

electronic thermometer using 741 IC circuit

A number of measurement circuits have appeared on this website. The project posted here is of Electronic Thermometer Circuit using op-amp 741. This circuit is suitable to measure temperature from 00C to 500C using a linear scale am-meter. The range can be extended up to 1000C using 100 microamperes. Circuit Description of Electronic Thermometer Circuit using 741 IC The circuit is self-explanatory for the experienced hobbyist and performs its task with a minimum number of components. The operational amplifier is used in compactor mode. The diodes D1 and D2 are used…

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High/Low Voltage Cut-out Using Op-Amp 741

high low voltage cutout circuit diagram

Ever had that mini heart attack when the lights flicker, and you wonder if your expensive appliances just took a hit? Electricity, unpredictable as a summer thunderstorm, can be a blessing or a curse. One moment it’s steady as a rock; the next, it’s spiking like a roller coaster. That’s where a voltage cut-out circuit steps in—your personal guardian angel against electrical bedlam. Why This Circuit Matters Imagine your refrigerator humming happily along. Out of nowhere, a voltage spike bursts in like an unwanted house guest. Your trusty refrigerator can…

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Door Ajar Alarm Circuit

circuit diagram of door ajar alarm circuit

Here is an another alarm circuit in the section of sound generator, the project posted here is of door ajar alarm circuit which alerts in every ten seconds that your door is open. Circuit Description of Door Ajar Alarm Circuit The heart of the circuit is 14-stage ripple carry binary counter IC CD4060. The working principle of the circuit is very simple, when high input at reset pin (pin 12) is given all the output becomes low and vice-versa.  Switch SW1 is used as door open/close sensor, when the door…

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Earth Quake Alarm Circuit

design of earthquake sensor

Here is a simple project called earth quake alarm circuit. This circuit is divided into two sections. Geo mechanical detector (Earth quake sensor) Alarm circuit The earth quake alarm circuit is based on the principle that earth quake create slow and suddenly vibration. In order to detect this vibration geo mechanical detector is used. The construction of geo mechanical detector is shown in figure 2. Alarm Circuit | Earth Quake Alarm Circuit The alarm circuit is built around dual input, 4 NAND IC (CD4011) and a NPN transistor. Input of…

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