On/Off Switch

roger-k · 17th February 2005, 09:18 PM

I have make a on/off switch for my amp as turn off the amp if there is a power cut.
I also would use only one single switch. (it looks more professional) There is many suchlike circuit diagram but all of them has voltage on the electronics when the amp is off.

Some advantages with this circuit:
If you have a amp with a big transformer and a main switch for all the wall outlet, then the main switch will be blown after a while,
if you don't turn off the amp before you tur on the main switch.
There is no voltage on the electronics when the amp is turned off.[IMG]C:\Download\toggle relay.jpg[/IMG]

AndrewT · 18th February 2005, 07:29 PM

Hi,
looking at your schematic it seems I need 2 off 3pco and 1 off 3pco, all AC coils.
Is this correct?
These are a bit expensive!
Is there a way to wire in a 12v or 24v transformer and then use dc relays?

Bill Fitzpatrick · 18th February 2005, 08:46 PM

I am sure there is a toggle switch that meets your needs without your having to resort to relays. Sorry, I can't provide a mfg or model.

AndrewT · 19th February 2005, 10:04 AM

OOPS that should have said 2 off 3pco & 1 off 4pco.
But a further thought, use a sp heavy duty for K3d(load) in parallel to lo current 3pco K3 gives a requirement of 3 off 3pco locurrent & 1 off 1p for load, all AC coils.

roger-k · 19th February 2005, 11:37 AM

AndrewT: Yes, it is correct, you need three relays.
I'm not sure if I understand your question but you can of-course use 12 or 24 V relays and in addition use a rectifier to make DC.

Bill Fitzpatrick: I thought the same but I have been looking for a switch with this function for several months now. I you find a switch I will be very interest.

AndrewT · 19th February 2005, 12:59 PM

Hi,
to rephrase my question.
I like the real off (not standby) and the revert to off when power fails that your switching system provides.
Keeping to that philosophy, can you design a modification to allow a LV transformer to be switched on by your system that also provides the power to pull in the relays and again transformer off with switch off or power fail?

roger-k · 19th February 2005, 04:14 PM

I don't think it is possible if you want "real off" bacause when the system is off there is no voltage to pull the relay.

Bill Fitzpatrick · 19th February 2005, 07:13 PM

Why not consider a pair of momentary pushbuttons, one for on and one for off? This way you could get by with a single relay with a pair of n.o. contacts.

roger-k · 19th February 2005, 08:37 PM

I tought the same. But the clue was one single switch.

bremen nacht · 20th February 2005, 08:06 PM

Quote:

Originally posted by Bill Fitzpatrick
Why not consider a pair of momentary pushbuttons, one for on and one for off? This way you could get by with a single relay with a pair of n.o. contacts.

Quote:

Originally posted by roger-k
I tought the same. But the clue was one single switch.

Centre-biased toggle switch?

18th February 2005, 07:29 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, looking at your schematic it seems I need 2 off 3pco and 1 off 3pco, all AC coils. Is this correct? These are a bit expensive! Is there a way to wire in a 12v or 24v transformer and then use dc relays? __________________ regards Andrew T.

19th February 2005, 10:04 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	OOPS that should have said 2 off 3pco & 1 off 4pco. But a further thought, use a sp heavy duty for K3d(load) in parallel to lo current 3pco K3 gives a requirement of 3 off 3pco locurrent & 1 off 1p for load, all AC coils. __________________ regards Andrew T.

19th February 2005, 11:37 AM	#5
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	AndrewT: Yes, it is correct, you need three relays. I'm not sure if I understand your question but you can of-course use 12 or 24 V relays and in addition use a rectifier to make DC. Bill Fitzpatrick: I thought the same but I have been looking for a switch with this function for several months now. I you find a switch I will be very interest. __________________ Roger

19th February 2005, 12:59 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, to rephrase my question. I like the real off (not standby) and the revert to off when power fails that your switching system provides. Keeping to that philosophy, can you design a modification to allow a LV transformer to be switched on by your system that also provides the power to pull in the relays and again transformer off with switch off or power fail? __________________ regards Andrew T.

19th February 2005, 04:14 PM	#7
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	I don't think it is possible if you want "real off" bacause when the system is off there is no voltage to pull the relay. __________________ Roger


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18th February 2005, 08:46 PM	#3
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	I am sure there is a toggle switch that meets your needs without your having to resort to relays. Sorry, I can't provide a mfg or model.

19th February 2005, 07:13 PM	#8
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Why not consider a pair of momentary pushbuttons, one for on and one for off? This way you could get by with a single relay with a pair of n.o. contacts.

19th February 2005, 08:37 PM	#9
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	I tought the same. But the clue was one single switch. __________________ Roger

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