? canceling headphone jacks ......

[delta88]

So I am looking for headphonejacks that when the headphone are plugged into them it would cancel the speakers on my cab out......  its either that or a decent pair of speakers for a pc with volume controls on each and headphone jacks on each....
the cost isnt to much of and issue but 100 would be a bit much

thanks

[Stormy151]

They make headphone jacks that do this.  Basically they would wire in-line with the speaker wires.  There are contacts inside that allow the audio to pass through to the speakers.  When you insert a plug, it spreads the contacts, breaking the circuit to the speakers and sending it to the headphones instead.

Gimme a sec and I'll find a link.

EDIT- I found them at Mouser.  Here is a link to a PDF of the catalog page:

http://www.mouser.com/catalog/616/613.pdf

You want fig. D, part number 161-3499.  Those are the exact ones I'm talking about.  The circuit diagram is fig 2.  I'm sure you can find them from another vendor, but I've had really good experience with Mouser.

Hope that helps.

[delta88]

cool, that looks like the thing...

one other item.. I am looking for a relay that when I apply 12 volts to from the pc power supply it will close and off of that replay I want it to turn on the arcade monitor and 8" tube behind the marquee...

I was looking in the mouser catalog but didnt make heads nor tales of it.

thx again!

[Stormy151]

Probably just would need a latching 12V DPST relay- unless the monitor on/off needs a momentary.  Then, you could just use 2 12V single pole relays, a latching and a momentary.

Make sure you select a relay that can handle whatever current load will be on the poles.

[delta88]

well the relay will stay engaged untill i turn the pc off at which point the relay will go open and the monitor will turn off....... what kinda current we talkin about? well wht ever comes outta the plug in the wall. cause itll go fromthe wall plug to the relay..

[JustMichael]

delta88, if you are looking for a headphone jack locally try Radio Shack.  I think they might have one.

[Stormy151]

If you're sending 110v wall current through it would probably have to be a fairly robust relay, maybe rated for a couple amps.  Depends on the load the monitor puts on the circuit.  If it were me, I would probably try paralleling into the wires going to the monitor on/off switch rather than interrupting the line voltage.

I'm sure you can find one at Rat Shack.  You're right though, it wouldn't have to be latching since the 12v would be there the whole time the PC was on.

[grafixmonkey]

Also if you're looking for a sound card that has that behavior in its headphone jack, the Hercules Game Theater XP behaves this way, so do the Creative Labs "Platinum" cards (with the extra headphone jack that's in the drive bay thingy.)

BTW they detect it based on whether there's a plug inside the jack, so if you put an extension in but there's no headphones in the end of the extension, the sound will still be off.

And, about 110v wall current...   a low voltage, 20-watt device will actually pull much more current than a high voltage, 20-watt device.  Most devices that plug into the wall say how many watts they use on the back, or close to the plug somewhere.  Watts = Volts * Amps, so divide the watts the device uses by 110 and that's about how much current it pulls.