Melt solder DDS controller ?

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Subject: Melt solder DDS controller ?
n2go@arrl.net
Date: Thu Feb 26 2004 - 16:31:43 EST 

anyone spotted any of these?

Looking at the schematic I notice a 74LS42 switched by PB5,PB6 and PB7 of
the ATmel.
I would like to switch a pair of relays for each band.
There would be less wiring if I could mount the 74LS42 on the relay board.
How long a run could I use on the atmel outputs?  Should the line be
shielded? Decoupled? If the relays were on separate boards, say for
example a LPF board and a BPF board. What would be the best way to wire
them? Should the relays be in parallel or should they each have separate
transistor switches and a separate 74LS42? If separate 74LS42 's are used,
how can both be switched at the same time by the Atmel?

I ain't got no phd in EE :))

				73,

				Jim n2go

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