Analogue-sequencer

Hi Fred

On 9 Apr 2004 at 12:56, blip wrote:
> 
> everything worked fine at one point, then just stopped. i'm 100% sure of
> the orientation of all ICs. i triple checked the sockets when i soldered
> them in, and i triple checked the ICs before i inserted them and again
> after.
> 
> what i fear is that when i was running it, somehow i fried something.
> what, i don't know.

OK, so it appears that you have your ICs in sockets. That's good. Try removing them 
all, except the regulator, and power up again. Measure the output voltage of the 
regulator. What do you get?

If it's the required +5V, then the reg is working and there is no short across the rails 
on the board.

Next remove the power and start inserting ICs. You could start with the micro, just 
insert this and power up. Measure the reg o/p again. If it's still OK, the chances are 
your micro is still good. Power down again and put a few more ics in.check the supply 
rails gain. Keep going until you either find the chip which is dragging down the rails, or 
you get a fully populated board with the supply intact.

Keep us posted

Andy

--
Andy Wilson
http://www.techman.synth.net
mailto:andy@techman.synth.net