Simple 555 Timer Based Animal Repeller Circuit is small device to keep animals away, it make high sound which animals do not like and humans mostly do not hear it; also its main part is IC 555 timer which make high frequency sound. Sound is around 15 kHz to 120 kHz (ultrasonic), therefore, this circuit […]
Mini Projects
Simple LED Alert for Telephone Off-Hook Detection Circuit
This simple LED circuit detects voltage drops when we lift the handset, actively turning ON an LED to show that our telephone is in use. Also, circuit is good for old phones with no light alert and it is very useful for shared phones and stops call interruptions. Here, circuit runs on simple 3V battery […]
Simple Boost Converter LED Torch Circuit using IC MAX660
Simple Boost Converter LED Torch Circuit using IC MAX660 is small but useful light tool, as this project use MAX660 chip to make LED torch work well. MAX660 boost 3V battery to higher voltage and can light many LEDs, furthermore, it is good for battery devices needing more voltage and with no inductor needed. Also, […]
Simple QRP Antenna Tuner Circuit for RF Applications
QRP is word in ham radio which means to send signal with low power and it come from Morse code. ‘QRP’ say “lower your power” and this QRP use power rules like: Also, Simple QRP Antenna Tuner Circuit for RF Applications help send signal better and it connect low power radio to antenna. Then tuner […]
Simple 555 Timer Based Time Sense Tester Circuit
Simple 555 Timer Based Time Sense Tester Circuit is fun and easy to make, it uses IC 555 and make time delay, so press one switch and start timer. Then guess time presses second switch and it stop and then LED show result and it is good for learning how brain feel time. Also, circuit […]
Simple 12V DC Fan Speed Controller Circuit
Simple 12V DC Fan Speed Controller Circuit is an useful project in electronics, it changes fan speed by adjusting the voltage; also, this post talks about fan speed controller using IC LM2941. LM2941 is low dropout voltage regulator and it handles up to 1A current and it is good for cooling, temperature control and automation […]