International rectifiers has some really nice solid
state relays. Try the PVN012. You just have to drive
7mA (LED current) into the relay to open it. I think
it can handle upto 3A (?). It is expensive though.
On the other hand, if you are going to have <80mA
going through the relay, try the Analog Multiplexer
--- friedt jean-michel <firstname.lastname@example.org> wrote:
> > > Just want to throw my two cents in here... Make
> sure the relays you are
> > > using are rated for very low current or they
> will foul up after many
> > > operations. Usually this means gold tipped or
> mercury whetted and sealed.
> > > Relay contacts rely on there being a fair bit of
> current (relative to the
> > > size of the relay) to keep the tips clean.
> > I will keep that in mind. I am also researching
> solid state relays, but
> > finding ones with useful ratings can be hard. I
> was also thinking about
> > using a triac to replace at least one relay
> (outgoing, not incoming).
> did you check the analog mutliplexers, such as the
> 4067 (16<->1 channels
> analog mux) ?
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