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
5 Tone control circuits using op-amp NE5532
These are Tone control circuit using op amp – NE5532 or 4558 IC as low noise, with PCB layout, can adjust sound frequency and tone bass, treble, mid and.. Read more
Non-contact AC Voltage Detector Circuit Diagram
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
5-20 Minutes Timer Circuit Using IC555
See a small 5-20 minutes timer circuit using the IC555, along with a PCB layout. It is a simple and compact, yet practical project to make. Read more
79+ Power Supply Circuit
If you are looking for a power supply circuit. Here may be the choice you need. over 150+circuits with PCB and easy to build, low price for a beginner. Read more