OT:Switching line voltages

[J. Larry Hendry]

Hey, Finally a question on synth-diy with which I know something <grin>

One of the easiest ways to do this with reliability is to purchase what is
called a solid state relay.  These have a wide range of control voltages
and switching voltages.  A DC control voltage of 3 to 32 volts is typical. 
And, you can find them in AC load side ratings from 1 amp way up to 50 amps
or more.  They are also available with AC switching voltages.  I used a
couple of these to replace the TERRIBLE circuit that Hammond put in their
860 Leslie for switching the fast and slow motors.  There is very little
current draw on the control voltage.  Could you build this circuit yourself
?  Sure.  But, when messing with mains, this is a safe way to keep them
isolated from the remainder of the circuit.  Most of them come with snap
over covers that cover the screw terminals.  

Larry Hendry


----------
> From: Plinio  Barraza <plinio at mail1.orientation.com>
> 
> Hi I know its OT but I was hoping someone might 
> help:
> 
> How can I switch a line voltage (110V60Hz) with 
> a small control voltage.  
> 
> At first I thought RELAY, but I don't want to 
> have to use a transformer or AC controll signal 
> (it does have to be ac right?).
> 
> Can this be done with power transistors?