yeah, thats exactly what I did. Which one is RX and RX2 if I put them on top of the other?. Right now I have the Bottom one as RX and the top as RX2.
I used 4151 MCP's and they work really well, they also have 256 steps.
Im still waiting for some part's but i will try to build the adapter with 4151 MCP's.W11cE did you improve some benefits using those digital potenciometers or you still use 4131 one's?If so, any tweak or any advise to take in consideration?Thank's in advance.