Hey guys.... Final Post to this thread Sorry to drag this on... I just wanted to post the solution I thought up. It is relatively simple and won't require me forking over cash for a DDS. Since 1024 step digital pots were a little spendy and still don't give me the 44900 steps (100hz to 45khz) I would need for my frequency range, i thought up the idea of combining two 256 step digital pots.
With a 50k digital pot /256 = about 200ohm increments
With a 200 ohm pot / 256 = will divide up that 200 ohm increments of the 50k pot
So combining the two effectively gives me a 16-bit digital potentiometer (256 x 256).
I'll use this to control the frequency and mark/space on a simple 555 PWM circuit.
With a 50k digital pot /256 = about 200ohm increments
With a 200 ohm pot / 256 = will divide up that 200 ohm increments of the 50k pot
So combining the two effectively gives me a 16-bit digital potentiometer (256 x 256).
I'll use this to control the frequency and mark/space on a simple 555 PWM circuit.
Last edited: