A electronic combination lock is a device which is designed to activate an electrical solenoid locking system whenever the correct combination of numbers are entered into an attached keypad. To […]
Higher Variable Output Voltage from IC 7812
You may have often wondered whether it was feasible to get higher voltages than 12 V from a 7812 IC? In this short post we learn how to configure the […]
Letter Box Open Indicator Circuit
In this post we learn how to build a letter box open indicator circuit, which indicates through an LED if the letter box had been opened either by the postman, […]
Loudspeaker Thump Sound Eliminator Circuit
While using amplifiers, we sometimes experience this very annoying thump sound, popping up in loudspeakers whenever the amplifier is switched ON or OFF. This normally happens with amplifiers that are […]
Electromagnetic Levitation Circuit [Anti-gravity]
In this post we will learn how to build an electromagnetic levitation circuit which can imitate an anti-gravity phenomenon by ensuring that an iron object remains pulled above the ground […]
Universal BJT, JFET, MOSFET Tester Circuit
This useful transistor tester allows the user to quickly check the functionality of an NPN/PNP transistor, JFET or (V)MOSFET as well as determine the orientation of their terminals, or the […]