This article for Simple RF Sensor without Battery Circuit show how to make small tester with no battery, also it help to check if radio transmitter is working or not. Moreover, the tester receives power from radio waves sent by the transmitter and if the transmitter works properly, the LED light blinks to indicate it. […]
Hobby Circuits
Simple Logic Probe Circuit using Transistors
This article for Simple Logic Probe Circuit using Transistors tell how to make one useful tool called voltage tester; also it uses two transistors for checking if some place in circuit have positive voltage. Further, when it find electricity it makes beep sound and small light turns ON. Here, people who want to learn electronics, […]
Simple Metal Detector Circuit
This article show a special trick to make a Simple Metal Detector Circuit, which uses simple circuit not like other circuits and needs only one transistor. The circuit find metal by catching signal from a normal radio. What is a Metal Detector: A metal detector is an electric circuit that checks whether metal is nearby, […]
Simple Beeper Circuit
This Simple Beeper Circuit show us how to make a easy beeper circuit; when we press push button a sound comes from unbalanced multivibrator circuit, where a small speaker makes the sound. Also, this project is good to learn music and electronics and is also fun project for beginners. What is a Beeper Circuit: The […]
Simple Adjustable Power Supply Circuit using Two Transistors
This Simple Adjustable Power Supply Circuit using Two Transistors is a simple power supply circuit, which can change the output voltage by using two transistors like BD140 and MJ2955 to control the voltage. What is a Adjustable Power Supply Circuit: Adjustable power supply circuit is an electric circuit which uses two transistors to change and […]
Flashlight Activated Remote Control Circuit
This project show how to make a Flashlight Activated Remote Control Circuit where we can turn it ON using flashlight. Also, the circuit uses a light sensor built with a transistor and a special LDR that detects flashlight. Furthermore, this article tell step-by-step guide how to build flashlight remote circuit and how to use it. […]