Switching off speakers when plugging in headphones? - diyAudio
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Old 23rd August 2002, 05:32 PM   #1
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Default Switching off speakers when plugging in headphones?

I would like my amp to turn off the speakers when I plug in my headphones. So I bought a headphone plug/contact with an internal switch. But, because I donít have a separate headphone amp ( just running them on the power amp, 330 Ohm resistor from speaker terminal) this switch now becomes useless. This, because the switch really is just a plate that contacts the signal pin.

I canít make the switch turn on relay, which in turn turns off the speakers, because I canít put a signal for the relay on the channel-pin.

Any bright ideas? The contact looks like this illustrated on a drawing and a pic.

Best Regards,
Chris V
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Old 23rd August 2002, 05:35 PM   #2
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.
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Old 23rd August 2002, 11:27 PM   #3
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Cut off the old headphone plug and install a new one with the 330 resistors inside of it.
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Old 26th August 2002, 01:45 AM   #4
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Or

Put it after the pre-amp, but before the main amplifier.
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Old 26th August 2002, 01:58 AM   #5
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I doubt that his pre-amp can drive the phones.

This whole deal is out of desperation anyway. Using a phone jack as a speaker on-off switch is not a particularly good idea in any arena except low-fi.
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Old 26th August 2002, 02:04 AM   #6
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I'd just use the switch contacts inside the headphone jack to open an NC (normally closed) DPDT relay connected at the speaker output.

It'll cost a bit, but it should be relatively bulletproof.
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Old 26th August 2002, 02:17 AM   #7
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The switch contacts inside the jack have the audio signal. As Christian originally said, they are not available for anything else.
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Old 26th August 2002, 02:28 AM   #8
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Why don't you get a regular headphone jack, connect 330 ohm resistors to it from speakers output and install a switch at the back of your amp which can disconnect the speakers. It may be mechanical (like double pole AC switch) or toggle switch controlling a relay. Do you really need convenience of automatic speakers shutoff when you plug your phones?
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Old 26th August 2002, 06:36 AM   #9
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Hi,

Well, I'd really like to be that convenient, but it seems it doesn't work.

Maybe I'll have to go with the switch anyways, or find some other phone-jack.

/Chris,
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Old 26th August 2002, 06:41 AM   #10
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You can easily pass the necesarry voltage through the contacts in the jack to fire a relay to the speakers and use caps to bypass this voltage from getting into phones and the amp. I don't see why it wouldn't work, perhaps even very well... If you guys want a diagram of what I'm thinking, I'll happily supply it!
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