Learn basic DIY fiber optic intercom circuit with PCB
A simple fiber optic intercom communication systems to home use. Video Door Phone Intercom is going to happen in the future. or Meetings monitor route. Read more
Cheap alcohol tester circuit
Party is a lot of fun. Alcohol makes us happy. And. we should make an alcohol tester. Why? We do not need sad about it, right? Imagine your friends who live in California, USA. He said that he likes to party with friends. With alcoholic beverages and the need to drive a car. He does … Read more
Transistors Dynamic Microphone Preamplifier Circuit with PCB
The Dynamic Microphone Preamplifier circuit. So low noise signal,use three transistor (2SC945, or 2C1815 or 2SC828) is transistor amplifier with a low noise […] Read more
Simple 12V transistor switching power supply
Can we build the switching dc power supply circuit with 2 transistor? This may be a good choice for you. Read more
Automatic night light circuit using SCR
This automatic night light circuit to controls power on-off in home. If daytime stop working circuit. But at night will working electrical AC 220 volts. […] Read more