Originally Posted by debjit625
Look you didnt understood,To program PIC16F84A you need a high voltage on MCLR pin which should be greater than 12VDC and Less then 14VDC (as per datasheet),now in case of JDM based programmer where this voltage comes from? it comes from the serial port of your computer ,but here is the problem not every computer is able to provide this much voltage so it will not work.
If you dont have parrallel port then make a serial port programmer with external power supply. http://www.oshonsoft.com/picprogserial.html
Or you could search google "external powered PIC serial port programmer"
Hope this helps.
thank you, now i get it, Do i still need to have an external power supply for the 2nd wire to power up my Programmer board? at the same time I'm connecting the 1st wire to the 13v power supply too (Do i need here a circuit like composed of resistors and capacitors)? Did i get it right sir?