Any junk box part with Vceo >=25V, reasonably low leakage and HFE>50 will be fine. You just tell WinPic if you have substituted an inverting buffer. The IC should be a 74 series TTL 7407 or 74LS07 although just about any inverting or non-inverting logic buffer WITH OPEN COLLECTOR OUTPUTS that are rated for 15V VoH MAX or higher can be used. You would be better served by the classic Tait parallel interface programmer *IF* you have any XP or earlier PC with a parallel port (again, not a USB one): NEVER try to use one for ICSP as they just don't have enough drive capability and Vss is NOT the same as PC ground. However if built properly and used on a desktop PC's proper serial port that has at least +/-12V output swing they do work fairly reliably. JDM programmers are crap by design as there just aren't enough output lines on a serial port to properly implement the ICSP specs for many common flash PICs. The PGM pin must be grounded to prevent it entering LVP mode. ![]() ALL Vss pins and all Vdd pins on the 40 pin socket 8MUST* be connected. Connect to corresponding pins on a 40 pin socket (see the PIC18F4450 pinout in the datasheet) and it should work OK. In the true JDM schematic above, just the stuff round the socket.
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