This article for Simple Adjustable Oscillator Circuit using Two Transistors show how to make small sound circuit using only two transistors! When we turn the knob the sound goes high like beep or low like growl. We can use four AA battery or small wall power to run this circuit. Try this easy experiment to […]
Simple Car Fused Tail Lamp Indicator Circuit
Simple Car Fused Tail Lamp Indicator Circuit tell how to make one easy circuit for check car back lights are ON or not. It uses one common part called resistor to know if light are getting enough power. If light goes OFF the circuit gives an alarm to show problem. This thing is good help […]
Crystal Tester Circuit
Did anyone ever think how quartz watch or radio keep time so good? It uses one special thing called crystal oscillator. This post for Crystal Tester Circuit show how to make small tester to check if crystal is working or not. Tester are made with simple parts like transistor, resistor and capacitor. WARNING: Making electric […]
Simple Delay Timer Circuit
This article tell how to use simple parts like transistor, capacitor and diode to make Simple Delay Timer Circuit. This timer can wait some time like few seconds or minutes before turning something ON. This kind of delay timer is needed in many circuits so things happen in correct order. What is a delay timer […]
Latch Circuit using Transistors
This article for Latch Circuit using Transistors talk about how to make a small electric switch. This switch stay ON even after signal goes OFF. It does not cost much and is easy to make. It uses transistor and some other parts. If someone gives small signal to turn it ON it stay ON and […]
Set Reset Latch Circuit using Transistors
This Set Reset Latch Circuit using Transistors tell us how to make an easy electric switch with two ON/OFF using two transistors. Some special switch like SR latch is used in many devices for keep data safe even when power goes OFF and come ON again. Transistors like BC547 and BC557 mostly used in this […]