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Ok, MVS Sharma,
I upload the zip file manually.
Please see it for me, friend.
Programmable Vpp is not too much necessary for general purpose, as I think. It's only required when internal MCLR and some other configs turned on.
Parallel port programming of 18F2550, doubtful without Vpp
Which schematic are you using? Is it Junebug PK2SE (aka the commom schematic which is found in the junebug manual).
To MVS Sharma,
.......................
To All,
Everytime, I always love the way, where is confusion, unknown, darkness of misconceptions etc. So, at first I'll build the Junebug Lite. If it works. I'm done. If it not, I'll again build the full junebug. I know one of them will work successfully.
I have built about 15 Junebug PK2SE's. They work. I am not sure when Bill did the Lite version. It may be an earlier design. I would build the PK2SE.
The Junebug is a programmer plus tutor using a 18 pin 18F chip. The PICKit2 Lite is a programmer only without the Vdd switching that allows Vpp before Vdd programming.
Can you please explain Vdd switching?
Can you please explain Vdd switching?
, I understand. You wanna tell not to use the 2N7000. If we don't use it, the pin no. 24 (TGT_N) of 18F2550 no more need to be connected to 2N7000's G pin. Am I right?Just short the BS250 D&S and leave out the 2N7000 it'll work like a charm