[SOLVED] Pickit 2 clone and adapter board

I bought a new pickit2 clone.
I prefer an adapter board to program the pic mircos.
Presently I have 28 pin micros 16f72, f873a, f876a and (628a - 18 pin).
I have 28 and 40 pin zip sockets to make the adapter.
I thought it might be a good idea to have 28 and 40 pin micros on a 40pin zip.
I compared both pin connections. interestingly vdd and vss of both on the left side didn't match.
if I put 28 pin micro in the 40 pin Zif- MCLR, PGD, PGM , PGC , VDD, VSS are ok, but pin 11,12 of 877a is vdd and vss respectively and pin 8 of 876a is vss. is it ok if I don't connect 876a - vss - pin 8 ,and 877a - 11 and 12 - vdd and vss to program the chip.

This question may seem silly, presently I have 28 pins micros which I can check , but I am about to order 40 pins micros today, will take 4 days to reach me, by then I hope to complete the adapter.
THanks in advance.

Hi,

Look at other boards and see how they have done it; here are just two -

https://www.mpja.com/download/14350kt.pdf

**broken link removed**

Just an added note on the J1Systems adapter board that is not completely obvious from the the pictures -- at least not on my monitor. Consider the adapter for the 8 and 14 pin PIC's. On the first schematic, you will see jumper pins labeled, "BC" or "A". "T" has been added to the newer version on the second schematic. If you look at the list of devices (page 3) you will see which are in group A, B, C.or T. Assume you have a device that is in group "B". The PCB is labeled the same as the schematic. So, you put a jumper across any set of pins that has a "B" in its label.

I also put a small decoupling capacitor between Vcc and GND on the 6 pin header. It helped when I was using a PicKit3 with these boards. It may not be needed for programmers with more robust power supplies. You may want to consider that for your PK2 clone.

John

I designed one adapter with 40 pin zip and a jumper to select 28 and 40 pins chips. 40 pin 877a which I ordered arrived yesterday.so I tested writing to both , It completed successfully, then I tried to use it without the jumper and it worked. I mean, pin 8 of 873a and pin 11 and 12 of 877a was not connected, it completed writing to flash successfully. it seems ok, but I am yet to connect it to a live circuit. let me try.

Okay, it is working well with side 2 powersupply only... tnx.