So I put together a gps disciplined ad9850 dds system with a lcd, proud of the creation I built a case for it and assembled everything.
Worked for a minute then nada.
Silly me I powered the system from usb while developing it, but on the cased up version powered it from a 9v wall wart, I used 3 x ac logic ic's to divide the 125mc clock down to a freq the 'duino can count, and it looks like I drew too much current with too much voltage diferential across the 'duio's reg.
I found spec for a genuine 'duino 450ma can be pulled from the 5v rail totall, but I cant find anything about the voltage differential.
Any info on this would be great, pkus my arduino's are non original so I spose the rating will be less.
I'm thinking use a 7805 and squirt the regulated dc into the raw 5v pin, and route separate volts to the counter / lcd / ad9850.
Might even try repairing the 'duino.
Worked for a minute then nada.
Silly me I powered the system from usb while developing it, but on the cased up version powered it from a 9v wall wart, I used 3 x ac logic ic's to divide the 125mc clock down to a freq the 'duino can count, and it looks like I drew too much current with too much voltage diferential across the 'duio's reg.
I found spec for a genuine 'duino 450ma can be pulled from the 5v rail totall, but I cant find anything about the voltage differential.
Any info on this would be great, pkus my arduino's are non original so I spose the rating will be less.
I'm thinking use a 7805 and squirt the regulated dc into the raw 5v pin, and route separate volts to the counter / lcd / ad9850.
Might even try repairing the 'duino.