Insects and mice repellent circuit using IC556
Use high frequency out of the piezo speaker and IC-556 is base as oscillator between 22kHz and 56kHz
This projects is safer and more convenient. Read more
LM317 Lead Acid Charger | 6V, 12V, 24V
See 4 LM317 Lead-acid battery charger circuits for 6V, 12V, and 24V battery, with automatic charging and full charged Indicator Easy to build. Read more
36 Hobby Electronic Projects
Are you bored? Watching TV or playing games not your way. Let’s do the Hobby Electronic Projects. I try to collect project lists. You may build quickly them when having free times. Most cheap and easy to find parts. Read more
Food & Water Salinity Tester Meter circuit
SEE a simple salinometer or salinity tester in food and water. Good for health. Using LM324 and few parts and LED display easily use, with 9V batts Read more
0-50V 3A Variable power supply circuit
Let’s build 0-50V Variable power supply circuit, 3A. can adjust output 0V to 50V with overcurrent protection at 3 A. Easy Linear supply. Read more