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ISTR that the programming interface for PLL chips is the three wire serial
form, with a static clock. you _COULD_ drive it with three switches, but you'd have to at least debounce them - RS flip-flop from NAND ususally being the simplest way. Might be interesting to derive a driving circuit from el-bug principles! Scott Dorsey wrote in message ... All of the AD synthesizers I have seen have a microprocessor interface, where they basically memory-map into a processor. I'd rather have something I can directly address. I could probably pull out a 68HC11 to control the thing if I absolutely had to, but I'd rather have something I can just latch a BCD input into. --scott |
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