abhishek singh wrote:
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i have interests,any kind of help you want,

I'm not looking for help right now. I wan't to test the programming boards I have made first. When I have them working, I'll start working on the "big one".

I have built one of the boards today, and so far it looks like it's working. I can control the Vpp and Vcc supplies and toggle various pins, so I'll just have to write some test software.

i can work on both PC and circuitury side.

My plan was to avoid any software on the PC side. My idea is to create a simple menu system that can be controlled by any terminal emulator on the PC. That way the programmer can be used on almost any system (Windows, DOS, Linux, BSD, OS/2 etc. perhaps even on a Mac?) without installing anything...

But I could use some suggestions for a part of the circuit. I need to switch some pins on the programming socket between a logic signal and a supply pin. The most obvious choice as I see it would be an analog switch. But most of them seem to have a 30mA limit. There must by chips available with a 100-200mA limit? Maxim makes a few models but they are all very small (narrow SO). I would like a DIP or PLCC chip. It would also be good if the chip was cheap and optainable... I could use small relays, but a chip would be nicer...

Best regards,

Mikkel C. Simonsen