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I designed it with following WinPIC-800 (V3.64) Hardware (PG3b) PC Parallel Port 12-20V/DC Power Supply In this programmer i modify the (PG3b) with my own techniques,First i modify the Parallel port cable that's one side is DB-25 (Male) connector and other side is DB-9 (Female) connector and this DB-9 (Female) Connector is plugin in DB-9 (Male) connector which is on the Programmer Board.This process that i do just only for the reducing the extra space of Programmer Board and make it much more efficient in working mode.All pictures and Fully operationally Working Video are attached. To get COMPLEATE PROJECT in working and tested condition feel free to contact with me just click on "About" link NOTE: ALL OF DATA OR METERIAL ON THIS BLOG IS JUST ONLY FOR STUDYING OR LEARNING PURPOSE ONLY

This is the Serial Port PC Battery Charger Circuit Diagram. This is one of the porters of the series "battery chargers that will never do." It uses the serial port of a PC to power a battery charger. A serial interface port can not supply enough current to charge batteries more powerful, but low capacity battery Nickel Cadmium (NiCd), this circuit is more than enough.You could, for example, use the batteries in a radio and charge them while using the PC.  The three serial port connections TxD, DTR and RTS, when not in use, are -10 V and can provide a current of about 10 to 20 mA. The circuit shown supplies a charging current of about 30 mA. If you need to change the polarity of the charging circuit, then it is a simple job, just reverse the diodes and use of software, change door signs to 10 V. Those interested can also write a software routine that automatically recharges the batteries. Serial Port PC Battery Charger Circuit Diagram

Using this circuit we can convert 5V DC from the computer USB port to 12V DC and a circuit like this will find a lot of application in USB powered systems. The heart of this circuit is IC LT1618 which is a constant current, constant voltage boost converter. The IC has a wide input voltage range of 1.8 to 18V DC and output voltage can be up to 35V DC. In the circuit resistors R1, R2 sets the output voltage. Pin number 9 is the shutdown pin, less than 0.3V to this pin will shut down the IC. Pin number four is the current sense adjust pin. The current sense voltage can be reduced by applying a DC voltage to this pin. If this adjustment is not needed connect this pin to ground and you can omit components R3, R5 and Q1. Simple 12V From USB Port - 5V to 12V Converter Circuit Diagram Notes C2 and C3 must be rated at least 15V. Less than 0.3V at the shutdown pin will shutdown the IC. Output voltage is governed by the following equation R1 = R2 (  (Vout /1.263V) -1).