194 articles written by D Mohankumar

Author: D Mohankumar

About: I was a writter on but now I have my own site where I publish from time to time.


transformerless power supply

TransformerLess Power Supply 12V 100mA

D Mohankumar - 11/27/2009

This is a transformerless power supply for low current applications. C1 is the X rated AC capacitor that [...]
heat sensor with transistor

Heat Sensor Circuit

D Mohankumar - 11/15/2009

Here are 2 heat sensor circuits, first one is build with the 4060 IC, the second one is [...]
earthquake detector schematic

Earthquake Detector Circuit

D Mohankumar - 11/13/2009

Here is an ultra sensitive earthquake detector circuit that can sense seismic vibrations. It can be used to [...]
220V LED Circuit Schematic

AC Powered 220V Led Circuit

D Mohankumar -

This is the simple version of a white LED lamp that can be directly powered from mains. It [...]