Air Puff Controlled LED Circuit is fun and easy project to make. We we blow air the LED turns OFF. It is used in no-touch controls, fun devices and displays. Main part is electret mic which hears our puff. Mic triggers transistor and transistor turns OFF the LED. It works with small power like 3V […]
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Car LED Voltmeter Circuit using IC LM324
Car LED Voltmeter Circuit using IC LM324 is useful project to check car battery voltage. LEDs show different voltage which is easy to see battery condition. Main part are LM324 op-amp which act like voltage checker. Voltmeter measures voltage between two points. This circuit is with LED voltmeter with IC LM324. The simple way is […]
Simple 12V Single Lamp Flasher Circuit
Simple 12V Single Lamp Flasher Circuit make lamp blink ON and OFF which looks cool. This circuit is simple and strong and is good for 12V car lamps. It is used in to turn signals, warning lights and fun lights. This one use BC557 transistor and IRF530 MOSFET. It works by charge and discharge capacitor […]
3 LEDs Battery Status Indicator Circuit
Battery status circuit is very useful in electronics systems. It helps keep battery healthy and working good in devices. 3 LEDs Battery Status Indicator Circuit is simple but works well and it shows battery voltage using three lights. Each LED shows different voltage. We can see if battery is low, normal or full just by […]
Simple Lamp Flasher Circuit using IC LM395
This post shows a Simple Lamp Flasher Circuit using IC LM395 to flash a lamp ON and OFF LM395 IC is a strong power transistor which works like a switch. It needs only few parts and can handle high current. It has safety features like heat and current protection. Even if design is simple it […]
Building an Auto Street Light Circuit using IC 741 and Transistor
This post talks about Building an Auto Street Light Circuit using IC 741 and Transistor. It turns ON at night and OFF at day. This circuit is simple and saves energy. It uses relay to control light, LDR to sense light, BC547 transistor drives relay and IC 741 works as a comparator. It is an […]