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Old 4th October 2008, 02:05 AM   #11
diyAudio Member
Join Date: Sep 2008
Location: Oregon
I have used standby switches in the CT since the 60's, in guitar amps.
However there are some precautions. Definitely use a snubber. Remember that in the open position, the switch sees the full standoff voltage of the secondary so make sure you use a heavy duty switch.
First saw this on old Fender amps.

The most you can usually get are 240v/10A for a standard toggle switch. They can handle it, but it isn't exactly EC or UL approved! To say the least. I have had these start to leak voltage before. Not good.

The relay that was mentioned is only rated at 240v so it may not survive the experience either.

Now, when I have to do this and it is for anybody but myself, I use a HV vacuum relay. These babies can take it all and then some, but will cost you dearly. Check out gigavac. I forget the model I use but can dig it up if interested. I think these set me back about $40US.
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Old 4th October 2008, 05:00 AM   #12
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Join Date: Mar 2004
Location: Albury NSW Australia
Default Yes Funkytek I am interested

I would like to get some for some other projects anyway so yes i would love it if you could dig up the info. If you could let me know how you rig it up (do yo use a snubber as well?)
I would be doubly appreciative
"Better to say nothing and keep them guessing than to speak and remove all doubt."
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Old 4th October 2008, 05:31 AM   #13
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Join Date: Jun 2002
Location: 3RS
Default MOSFET switch ?

How about a series MOSFET after rectification and switch that on and off ?
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Old 4th October 2008, 04:39 PM   #14
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Join Date: Nov 2007
How about a series MOSFET after rectification and switch that on and off ?
Hey, you could use the MOSFET as a regulator, too making a very smooth supply. HV MOSFETS are easy to come by and cheap compared to relays. You'd have to have some volts to spare to use this approach, though.
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