This article is about simple SCR tester circuit, where we can use this circuit to check SCR is good or faulty. The circuit uses one 9V battery, one LED, three 100 ohm resistors and two push button switches. The circuit is very easy to build as it is also very useful for students, hobby users […]
Meters and Testers
Mini Light Intensity Meter Circuit using LDR
Here, is very simple and useful mini light intensity meter circuit using LDR which uses one LM334 IC, one LDR, small analog milliamp meter and 1.5V battery or power supply. The circuit checks light level by changing meter current as per LDR resistance. When light increases, LDR resistance changes so meter needle moves, because of […]
Diode Tester Circuit using Op-Amp and LED
In this tutorial, we build a simple diode testing circuit which is very useful for beginners in electronics as it gives good learning and practical use. Normally, we use a multimeter to test a diode easily but sometimes a normal meter does not test all diode types properly. For example, a Schottky diode works on […]
Automotive Electrical Tester Circuit using 555 IC
Imagine checking car wires without guessing or risk, then this Automotive Electrical Tester Circuit using 555 IC makes it possible, which shows polarity instantly with LED lights. The circuit uses a 555 timer IC, so it becomes simple and is with low cost, also it can show positive or negative voltage by using two LEDs […]
Continuity Tester Circuit using Op-Amp
First of all, continuity testing is very important in electronics work, as it helps to find broken wires easily and it also helps to check PCB tracks. Sometimes wires look good but contain internal breaks, so technicians use a continuity tester to check them, hence, this simple Continuity Tester Circuit using an Op-Amp uses an […]
Low Voltage Alert Circuit for 9V Battery
Battery power plays an important role in electronic circuits, but the battery voltage can drop without warning; as a result, devices may stop working suddenly, making a low-voltage alarm necessary. This Low Voltage Alert Circuit for 9V Battery gives warning when a 9V battery goes low, as it uses LM339 comparator IC and also uses […]