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Posted by The Daring Dufas on July 2, 2009, 11:44 pm
Mortimer Schnerd wrote:
> I'm looking for a cheap 120 volt relay to use with my stereo system.
> I've got a receiver that has pre in/main out jumpers and so I've added a
> second power amp to it which is a lot more powerful that what's already
> built into the receiver. I'm actually powering three rooms of speakers
> (8 speakers all told); two sets on the receiver's power amp and 4
> speakers in my bedroom off the external power amp.
>
> I want the power to the amp to come on whenever I power up the receiver
> but it's a PITA to get to because of the way it's physically installed.
>
> The AC outlet on the back of the receiver is only rated for 100 watts
> max. The power amp can draw up to 11 amps so the receiver's AC outlet
> isn't going to work.
>
> So what I think I need is a relay. The switched outlet on the back of
> the receiver can power the coil and then the relay can handle the power
> requirements of the external power amp.
>
> So where can I find such a thing? Ideas?
>
>
>
> Mortimer Schnerd, RN
> mschnerd at carolina.rr.com
There is a wonderful outfit called FUNCTIONAL DEVICES, INC.
which manufactures some of the most versatile relays I've
ever used. I wish I owned stock.
http://hvac.functionaldevices.com/chartPilot.html
TDD
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Posted by ransley on July 3, 2009, 7:15 am
wrote:
> I'm looking for a cheap 120 volt relay to use with my stereo system.
> I've got a receiver that has pre in/main out jumpers and so I've added a
> second power amp to it which is a lot more powerful that what's already
> built into the receiver. =A0I'm actually powering three rooms of speakers
> (8 speakers all told); two sets on the receiver's power amp and 4
> speakers in my bedroom off the external power amp.
> I want the power to the amp to come on whenever I power up the receiver
> but it's a PITA to get to because of the way it's physically installed.
> The AC outlet on the back of the receiver is only rated for 100 watts
> max. =A0The power amp can draw up to 11 amps so the receiver's AC outlet
> isn't going to work.
> So what I think I need is a relay. =A0The switched outlet on the back of
> the receiver can power the coil and then the relay can handle the power
> requirements of the external power amp.
> So where can I find such a thing? =A0Ideas?
> Mortimer Schnerd, RN
> mschnerd at carolina.rr.com
Check standby load, it might save you quite a few watts putting
everything on a power strip and cutting power completely when not in
use. I dont know your set up but understand Ohms and polarity when
wiring speakers, improper ohms can damage some amps, reversing
polarity can cut out bass frequencies.
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Posted by Mortimer Schnerd on July 3, 2009, 9:34 am
ransley wrote:
> Check standby load, it might save you quite a few watts putting
> everything on a power strip and cutting power completely when not in
> use. I dont know your set up but understand Ohms and polarity when
> wiring speakers, improper ohms can damage some amps, reversing
> polarity can cut out bass frequencies.
I have a pretty good understanding of impedance and polarity. Not to
worry; I've been running this combination for some time now with a
different receiver. This new one is the same brand but has the pre in /
main out jumper that the other didn't. I had to use the tape out on the
older receiver to feed the external power amp and then control the
volume with the two pots on the front of it. It was not the ideal
situation but I'm getting there rapidly now.
I have used the external power amp exclusively for the four 12" three
ways that I have in my bedroom for some time now. Each pair is wired
in parallel. The receiver fed the other two rooms with a pair of
speakers in each. So I could control bass/treble in the other rooms but
not my bedroom. I could only control volume and balance there. I still
won't be able to control fade but them's the breaks.
This relay will solve my last annoyance.
Mortimer Schnerd, RN
mschnerd at carolina.rr.com
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Posted by Hipupchuck on July 3, 2009, 8:35 am
Mortimer Schnerd wrote:
> I'm looking for a cheap 120 volt relay to use with my stereo system.
> I've got a receiver that has pre in/main out jumpers and so I've added a
> second power amp to it which is a lot more powerful that what's already
> built into the receiver. I'm actually powering three rooms of speakers
> (8 speakers all told); two sets on the receiver's power amp and 4
> speakers in my bedroom off the external power amp.
>
> I want the power to the amp to come on whenever I power up the receiver
> but it's a PITA to get to because of the way it's physically installed.
>
> The AC outlet on the back of the receiver is only rated for 100 watts
> max. The power amp can draw up to 11 amps so the receiver's AC outlet
> isn't going to work.
>
> So what I think I need is a relay. The switched outlet on the back of
> the receiver can power the coil and then the relay can handle the power
> requirements of the external power amp.
>
> So where can I find such a thing? Ideas?
>
>
>
> Mortimer Schnerd, RN
> mschnerd at carolina.rr.com
If Radio Shack don't have one try All Electronics web site.
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Posted by David Nebenzahl on July 3, 2009, 2:18 pm
On 7/3/2009 5:35 AM Hipupchuck spake thus:
> If Radio Shack don't have one try All Electronics web site.
See my later posting with link to a 40 A relay:
http://www.allelectronics.com/make-a-store/item/RLY-482/120-VAC-40-AMP-RELAY/-/1.html
(And the hell with Radio Shack!)
--
Found--the gene that causes belief in genetic determinism
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> I've got a receiver that has pre in/main out jumpers and so I've added a
> second power amp to it which is a lot more powerful that what's already
> built into the receiver. I'm actually powering three rooms of speakers
> (8 speakers all told); two sets on the receiver's power amp and 4
> speakers in my bedroom off the external power amp.
>
> I want the power to the amp to come on whenever I power up the receiver
> but it's a PITA to get to because of the way it's physically installed.
>
> The AC outlet on the back of the receiver is only rated for 100 watts
> max. The power amp can draw up to 11 amps so the receiver's AC outlet
> isn't going to work.
>
> So what I think I need is a relay. The switched outlet on the back of
> the receiver can power the coil and then the relay can handle the power
> requirements of the external power amp.
>
> So where can I find such a thing? Ideas?
>
>
>
> Mortimer Schnerd, RN
> mschnerd at carolina.rr.com