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Hi, what's the largest # of relay channels the arduino can handle?

What I'd like to do is use relays to control a stepped attenuator or TVC with a bluetooth module (and android using btinterfaces).

Thanks,
Joe
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Each o/p can power a driver transistor or driver chip which in turn can drive a relay.
You can use multiple extender ICs, registers that can be placed in series to extend your relay count.

Why not tell us how many relays you need to drive?
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 23 steps x 2 channels. 

I was thinking of removing the physical switches for relays, control via bt and arduino.
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Which Arduino chip/board are you thinking of using?
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Review this:
http://tronixstuff.wordpress.com/2011/08/26/tutorial-maximising-your-arduinos-io-ports/
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