8 Light sensor alarm or Sensitive Sound Generator
These are four light sensor alarm circuits, when be become dark, or Light sensitive switch.Use part is important light sensor LDR light dependent resistor […] Read more
Meters & Detectors
Digital voltmeter circuit diagram using ICL7107 / 7106 with PCB
Here is simple ICL7017 digital voltmeter circuit easy to build and cheap because it is high technology, by single IC,small number, along by LED 3 digit. Read more
How to test a diode without meter
This Diode tester circuit can check the diode the good or bad and also can indicate its polarity. using op-amp 741IC and LED for display. […] Read more
Non-contact AC voltage Detector using transistors and IC
Let’s create a Non-contact voltage detector/tester circuit. Around five years ago, I taught my son to build this circuit. And now my daughter also wants to make it. It is a very useful circuit, uses to detect if the AC main wires or any electrical appliances have electricity in them or not. Read more
The Op-amp IC tester circuit
This is an simple op-amp IC tester circuit that cheap and easy to build. for test many op-amp ICs fast check. for LM741, LM324, LM339, LM358, LM311 and more […] Read more