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Brian,
That seems to work. I added a 13V zener between VPP and GND and it is able to program, read, erase and re-program a 12F629 chip that I have. I need to do a bit more digging because my 10F200 and 12F509 still won't program. I have a feeling I may have damaged them with the high voltage...
So you're saying with a 13V zener diode, it should be wired from VPP to ground, with VPP still having a direct connection to the VPP pin of the PIC? Doesn't that sink all the current from VPP straight to ground. Please forgive my basic understanding of electronics
I have done a very crude MS...
Yes I thought the VPP voltage is probably not healthy for the PIC, i'll try your reccomendation and get some 13V zeners at the weekend if I have time. What do you mean by
? Two normal silicon diodes in series, wouldn't that lower the 12V even further due to the forward voltage drop?
I have...
Brian,
Thanks for the advice. I added the two 100nf caps between VPP->VSS and VDD-VSS as my lines from the JDM to the PIC are about 10cm long. This definitely improved things slightly. I was able to do a blank memory check on the 10F200 chip once (reads all flash to see if it has been...
Hi Black_demon,
I built a PIC programmer from instructables https://www.instructables.com/id/Business-Card-PIC-Programmer/#intro, but before you go out and build that one it works but with buggy results so far. That could be due to my lousy soldering or a problem with voltage levels on my COM...
Hi all,
I have built myself a JDM programmer using a tutorial over at "instructables" which can be found here: Business Card PIC Programmer.
A lot has been written about JDM programmers and from what I can tell, most of the problems people have stem from either too low a VPP voltage, or not...
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