Schematics of delabs

This circuit uses a LM339, a quad comparator. LM339 can work on single or dual supplies, it has a open collector output that can drive 15mA, low power consumption. The circuit is an untested design but it should work. Mains Voltage and Power… more »

This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required. From my Power Electronic Circuits In the first regulator U1 the output is lifted up… more »

This is a a circuit from my  Power Supplies Section.  There may be some documentation errors in my circuits. If you are used to building and troubleshooting circuits then it is ok. This circuit is derived from an application note of L296, It… more »

This is an incomplete version of the power supply used for the Alertness Monitor with hourly LED Display. This circuit used a Dual Color LED. Green meant Alert and Red meant No Alert or acknowledge press. I can write here only in "Electronic English".… more »

This circuit is built around LM3647 an Universal Battery Charger, This Circuit is an untested design. It is based on application hints and was provided as an example to the user. This circuit gives a 12V DC from mains or battery and the battery is also… more »