Magnetic Gun

Picured in Figure 1 is a miniature magnetic gun. When optimally tuned, it will propel a small slug about 1.5 metres high, or 2.5 metres hor...

Ultrasonic Pest Repeller

It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can�t he...

Bar graph LED battery level indicator

This bar graph LED battery level indicator project is based on LM3914 monolithic IC from National Semiconductor that senses the voltage lev...

Ultra-Clean Power Supply

The schematic has been around on the net for a long time, thanks to Rick Barker. This is a great project and a great little unit to build. ...

22 Watts Mini Subwoofer Circuit TDA1516 with Adjustable Frequency

22 Watts Mini Subwoofer Circuit TDA1516 with Adjustable Frequency The subwoofer is a subwoofer or a apostle to carbon low frequencies, addi...