GuiRitter
After a lot of search I settled in this design. I guess it's as simple as it could get. I only want it to program the most common models, nothing more.
But there are some things in that link that I'd like to understand more clearly before ordering the remaining parts:
3. It's a Schottky diode. The original uses a surface mount BAT54, I think the exact wired equivalent is BAT85 but any general Schottky rectifier diode will probably do.
1. The programmer itself is powered from USB. That target device must be supplied from its own power supply during programming, since this programmer circuit cannot provide power to the target.
I thought that these two answers were conflicting, but then I decided to post the following quote, from the link from my first post, and then I understood.1. Correct - but the PicKit will first check for an existing supply and use it. If it doesn't see a supply, it tries to provide one itself.
What I removed:
(...)
The Vdd circuitry. Hence this programmer can not supply power to the target circuit. I thought this would be a problem for older devices such as 16F628 or 16F877A that, in theory, require Vpp before Vdd, but actually, it works anyway !
Bear in mind that when programming in-circuit there may be other devices drawing current from the supply lines and the PicKit may not be able to cope with the load.
This is my simple version which might help you identify the parts better.
Which country are you in that finding parts is so difficult? Possibly other readers can advise on local supply outlets
Are you only interested in programming 5V PIC's?
You should be able to mail order from http://www.farnellnewark.com.br it's the company I get almost all my parts from although I deal with the European outlets.
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