Quote Originally Posted by financecatalyst View Post
Hi, I have attached the schematic
Comments:

1) - There are no smoothing capacitors either side of the regulator - what are you using to provide the 12v supply. If it's simply a bridge rectifier off a transformer then the supply will need smootthing.

2) - I assume the diodes are LEDS ? If so then you would be better off putting them in series with the resistors rather than in parallel.

3) - If they are not LEDS, then try removing them from the circuit, there may be some reverse bias or something causing the current to flow and possibly short out the supply ?

As Dave has mentioned - It does sound as if you are constantly resetting the chip before it configures itself.