Adam Timmons wrote:
>
> i have built the pic2 programmer, and when i try to program a pic 12c508
> it says that notice ocilation value not their and its starts to program
> but when it gets done . it trys to verify twice and both come back false
> ... if any one can tell me what is wrong i would be thankful...
>
> adam

It may be more resons. Bad connections, missing components, bad
components etc. But also computer may cause problems. One had the same
problem, and it was because of computer.

Try to messure the voltage across C1 to verify if it is about 13V. If it
is too low, then add a 18V battery (2x9V) across C1 with a 150 ohm
resistor to see if it is better. If it works, then your comport is weak.
It may be an idea to cut off the ground to RS232 pin 7, and instead add
a 47uF capacitor between Vss (on chip) and RS232 ground, with - to Vss
and + to ground. I like to know if it works better, because I have no
computer that has the problem.

If noone tells that it actualy is better, then I won't correct it.

Regards,
Jens Dyekjaer Madsen