Simple Crowbar Circuit is safety part in electronics, as it protect from high voltage spike or surge; it work like fuse but does not burns and it gets short circuit fast to stop damage. Furthermore, it use SCR or TRIAC for shorting, transistor or Zener to trigger; also trigger watch voltage all time and if […]
Security and Protection
Motion Detector Circuit using IC 555
This easy Motion Detector Circuit uses IC 555 to find human from far, as circuit have two parts: Transmitter: IC 555 work like astable multivibrator and it make square wave signal and this signal goes out through IR sensor (infrared). Receiver: Phototransistor see IR beam and if someone moves and block the beam then phototransistor […]
Amplifier Speaker Turn-On Delay Circuit
As name say this Amplifier Speaker Turn-On Delay Circuit wait few seconds before connecting speaker to amplifier. When amplifier is first turn ON then big “thump” noise can happen and this delay stop that bad sound. Circuit Working: Parts List: Components Values Quantity Resistors 33k 1/4 watt 2 1k 1/4 watt 1 Capacitors Electrolytic 100μF […]
Touch Alarm Circuit using IC 555
Touch metal part and buzzer makes sound and this uses IC 555 in monostable mode. IC 555 is good for learning in simple circuits and in this Touch Alarm Circuit using IC 555 when someone touches the metal plate then buzzer makes loud alarm. Circuit Working: Parts List: Components Values Quantity Resistors 1M 1/4 watt […]
Electronic Horn Circuit using IC 555
Using popular IC 555 we can make Electronic Horn Circuit for cycle, alarm or fun use, as this Electronic Horn Circuit using IC 555 and one 8Ω speaker makes loud horn sound for car or alarm. Furthermore, one 555 IC work as astable multivibrator which means it make square wave by switching high and low […]
Simple Over Voltage and Reverse Voltage Protection Circuit
Our device is safe from bad voltage by using this Simple Over Voltage and Reverse Voltage Protection Circuit, as this circuit uses P channel MOSFET FQP47P06 which better than only diode. Furthermore, simple diode can stop reverse voltage but not protect from overvoltage or surge, but here the MOSFET and Zener diode give protection. Circuit […]