Want PIC16F84 Programmer....

yoku said:

Here is link for good PIC programmer + software.

www.picallw.com

If u want to build ur own then download the software and in the help file u will find all schematic ,discription.

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kinjalgp said:

Have a look at this circuit. Very easy to build using handfull of components.
**broken link removed**

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kinjalgp said:

SV1 - SV4 are actually parts of 40 pin IC socket. The left and right strips are separated and then soldered. This is a simpe trick to replace costly ZIF sockets. 4 strips r used so that it can accomodate both wide and narrow DIP ICs.

My transistor data book has no equivalent for BC846B. May be you should try and see if BC547/BC548 works or not.

The two diodes are 5.1V & 6.2V (correction in your no. it should be 6V2 at the end) zeners and you should find them in any electronics store. The power ratings are 250mW (I guess). Higher will also do. Even it won't have any problem with 250mW.

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kinjalgp said:

You can also have a look at other programmer schematics on same site i/e. https://www.olimex.com. I suggested you the above design because it is very easy to build. But it has some disadvantages.
1) It is powerd from serial port, so you have to remove the serial cable every time you want to program a new device otherwise there is a chance that you blow up your port.
2) You can't use single 40-pin ZIF socket instead of 4 strip-headers. This is beacause of the use of some common signals at different pins.

Otherwise, this circuit is ok for hobbyists. The other parallel port design is better than this one but more complex.

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kinjalgp said:

Since the circuit is powered from serial port, it remains active till your computer is on. So every-time you want to program a new chip, you have to first disconnect the circuit from computer in order to save your Serial Port / uC's life.

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Beni said:

Hi! I have built this programmer: https://www.olimex.com/dev/pic-pg1.html .
And it isn't work. when the program(icprog, ponyprog) verify the data i get the following error: Verifiy failed at address 000h! (icprog), Write failed! (ponyprog). I have checked the circuit 4 times. I tried under winxp win98 and
under linux (debian sid). I want to program pic16f84a-20/p.
I don't know this programmer works with it or not

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MarkK said:

Beni said:

Hi! I have built this programmer: https://www.olimex.com/dev/pic-pg1.html .
And it isn't work. when the program(icprog, ponyprog) verify the data i get the following error: Verifiy failed at address 000h! (icprog), Write failed! (ponyprog). I have checked the circuit 4 times. I tried under winxp win98 and
under linux (debian sid). I want to program pic16f84a-20/p.
I don't know this programmer works with it or not

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I am just about to start building one too, so I will be interested if you can get yours going...!
Mark K

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MarkK said:

Actually, I have decided against it. All the RS232 powered programmers are too hit or miss. The chances are that they won't work with laptops.
I'm doing this one by dB:
https://www.electro-tech-online.com/custompdfs/2003/10/dB_Programmer100PDF-1.pdf
Mark K.

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