Hi,
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I started working on next revision of PCB's. I will add band switching for external power amp through AUX port. Will Use LPF0-LPF5 as an input for the current band, feed it to unused ports of ATMEGA328P and produce output through AUX. I already have a prototype code working that implements YAESU FT817 band signaling protocol through PWM port. It works with my HARDROCK-50 amp.
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In the future might do a KENWOOD protocol. YAESU was a low hanging fruit although not my preferred protocol. It uses analog voltage values mapped to bands and it is so old that predates the 60m band and does not have a value for it.
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Meanwhile, if someone with audio amp experience could look at schematics and suggest audio amp improvements - I add that to the next revision as well. No ETA, with full time job I use my free time for the hobby :)
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73,
Sardar (AC8L).
