IA76 Posted February 8, 2016 Share Posted February 8, 2016 Hi A room is on the 2nd floor of a building and the 100v amp for that room is in the basement. The amp can't be moved. To power the amp on/off from the room is the only way to run a 3 core power cable from a switch in the room to the basement? The amp doesn't have a remote switch connection Link to comment Share on other sites More sharing options...
Andrew C Posted February 8, 2016 Share Posted February 8, 2016 Relay in basement with power supply, low voltage switch upstairs. Link to comment Share on other sites More sharing options...
Shez Posted February 8, 2016 Share Posted February 8, 2016 "Contactor" is the magic word. Link to comment Share on other sites More sharing options...
Richard P-W Posted February 8, 2016 Share Posted February 8, 2016 Do you actually need to turn off the amplifier or just mute the speakers in the room? Link to comment Share on other sites More sharing options...
p.k.roberts Posted February 8, 2016 Share Posted February 8, 2016 Depending on the 'connectivity' in the building, here are plenty of IP based simple mains switched outlets out there - even some 'home automation' products might fit the bill. Link to comment Share on other sites More sharing options...
J Pearce Posted February 8, 2016 Share Posted February 8, 2016 I'd leave the amp on and switch out the speakers. You'd need a load though, as most 100V amps can't run unloaded. The load could be a monitor speaker in the basement? Link to comment Share on other sites More sharing options...
IRW Posted February 8, 2016 Share Posted February 8, 2016 I'd leave the amp on and switch out the speakers. You'd need a load though, as most 100V amps can't run unloaded. The load could be a monitor speaker in the basement? Surely that could result in music blaring out in the basement?! Link to comment Share on other sites More sharing options...
sandall Posted February 8, 2016 Share Posted February 8, 2016 For "load" read suitable wire-wound resistor. Link to comment Share on other sites More sharing options...
Bazz339 Posted February 10, 2016 Share Posted February 10, 2016 You'd need a load though, as most 100V amps can't run unloaded. Can't they? I have never really thought about it but a lot have multiple switches for the 70/100V speaker outputs on them which can leave all the outputs off. Link to comment Share on other sites More sharing options...
J Pearce Posted February 10, 2016 Share Posted February 10, 2016 I've certainly read it on more than one that I've installed, probably to do with transformer outputs and not allowing the voltage to rise too high. Link to comment Share on other sites More sharing options...
IA76 Posted February 10, 2016 Author Share Posted February 10, 2016 The actual amp needs to be turned off so the relay system seems ideal. Thanks Link to comment Share on other sites More sharing options...
adam2 Posted February 10, 2016 Share Posted February 10, 2016 Yes, a simple mains rated relay in a suitable enclosure. Mains in via an appropriate length of 1.5mm flex fitted with a 13 amp plug. Mains out via a 13 amp socket mounted on the enclosure. I would use a relay rated at the full 13 amps just in case someone re-uses the handy remote control device for a heater or something. Apply a warning notice to the socket and to the amplifier that states "WARNING, REMOTELY CONTROLLED, MAY BECOME LIVE WITHOUT WARNING" Alternatively, if you do not mind slightly modifying the amplifier, you might be able to fit the relay internally. Suitable warning notice again required. Usual caveats about mains voltage. Power the relay from a cheap plug top power supply of voltage to suit the relay coil, but preferably no less than 12 volts or voltage drop might be a problem. The wire from the plug top PSU upstairs and the relay in the basement can be anything cheap, bell wire, speaker flex, phone cable etc. Link to comment Share on other sites More sharing options...
Robin Pratt Posted February 10, 2016 Share Posted February 10, 2016 Alternatively, if you do not mind slightly modifying the amplifier, you might be able to fit the relay internally. Suitable warning notice again required. Usual caveats about mains voltage. Power the relay from a cheap plug top power supply of voltage to suit the relay coil, but preferably no less than 12 volts or voltage drop might be a problem. The wire from the plug top PSU upstairs and the relay in the basement can be anything cheap, bell wire, speaker flex, phone cable etc. Indeed, if you're going to be that clever about it, take it these few final steps as well... 1. Use a DC power rail from the amp itself to operate the relay, so only a switch is required at the far end, no extra PSU. 2. Make the external connection on the amp using a break contact jack, so that unplugging the remote switch cable shorts out the remote switching and returns the amp to standard local switching. Link to comment Share on other sites More sharing options...
timsabre Posted February 10, 2016 Share Posted February 10, 2016 In these days of blame and litigation I would not consider internally modifying the internal mains wiring of the amp. If anything untoward were to happen with the system (even if nothing to do with your modification) you would be suspect no.1 A relay like this in a little box would be perfecthttps://www.tlc-direct.co.uk/Products/SR504.html I'm surprised nobody makes a plug-in 12v controlled relay with a socket outlet on it, but there only seem to be radio ones which probably wouldn't work reliably. Link to comment Share on other sites More sharing options...
Simon Lewis Posted February 10, 2016 Share Posted February 10, 2016 Canford have a little gizmo.... http://www.canford.co.uk/Images/ItemImages/large/42-6701_01.jpg Link to comment Share on other sites More sharing options...
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