need a 256 steps volume.

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Hi! I'm tried to build a Aleph P 1.7. I finish most of the PCB except volume board. I want to build a 256 steps relays volume that use ADC0804. I tried to searched the forums but I can not find the one that I understand (I have a very low knowledge about electronic). Can anyone please send me the circuit of the 256 steps relays volume that use ADC0804. Thank you very much.
 
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