This Simple Multi Siren Tones Circuit using the UM3561 chip works like a small sound box for emergency vehicle sounds. Moreover, the special UM3561 chip can create many siren noises, such as the “wee woo” sound of a police car or the fast tone of an ambulance. Furthermore, it only needs few more parts and […]
Hobby Circuits
Simple Fatigue Testing Circuit
This small and simple Fatigue Testing Circuit is a fun way to check whether someone feels tired or not! it makes LED blink very fast and we can change how fast it blink. Also, if we are not tired, we can still see the LED blink even when it flashes fast; however, if we are […]
Simple IC TDA2822 Stereo Audio Amplifier Circuit
Simple IC TDA2822 Stereo Audio Amplifier Circuit is small chip with stereo amplifier makes weak music sound go louder which is strong enough for speaker or headphone. However, despite using very little energy it still provides 250 milliwatts each side with good sound for small things like walkman, hearing aid or little stereo. So next […]
Solar Powered Animal Scarer Circuit
First of all, this Solar Powered Animal Scarer Circuit is very simple and very useful project for farm, garden and home protection. To begin with, it use solar energy, so it save electricity and work in eco-friendly way. Moreover, it scare animals like cat, dog, monkey and birds by using flashing light or sound signals. […]
Simple DC Electronic Fuse Circuit
Is anyone sick of the fuse blowing? then this Simple DC Electronic Fuse Circuit can be helpful! DC electronic fuse circuit is like small hero for ones electronics, as it protects from big current going crazy. Old fuse? we break it then one may need new one, but this one? it uses smart components always […]
How to Build a Simple LED Circuit
This article teaches us How to Build a Simple LED Circuit; an LED is small special light that shine when to get electricity. Also, this project show how to join some parts together to make LED turn ON. Moreover, people use LED circuits in many things like torch lights, car back lights and even big […]