I would like to build a DDS Generator using the AD9850 IC.
But I don't want to use a cpu or controller chips.
To keep it simple, I would like to set the Freq. using DIP switches.
The following website has a circuit that does it.
He is using the AD9851 but the AD9850 is very similar.
http://www.hanssummers.com/radio/dds/index.htm
But he is only using the 24 MSB.
I want to use the full 32 bits.
I don't know how to modify his circuit to include the other 8 bits.
Does anyone understand this circuit well enough to make that mod.
using the same 74HCXX chips he is using.
I'm thinking that the 74HC08 may be setting 4 of the 8 LSBs but I don't know.
In any case I want to set them using dips.
This would make an awsome Frequency generator, I can get the AD9850 IC for $20.
Thanks.