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Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267
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 Posted: Tue Nov 17, 2009 10:31 pm Post subject:
How to Switch Power with a Jack Switch?
Subject description: What a turn-on! |
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I want to build some thingies that turn on automatically when you plug in an audio cable, and turn off when you unplug the jack. They will run from 9V batteries, in some cases one battery and in other cases two (+/- 9V supply). I'm told that this is commonly done, yet I'm at a loss as to exactly how to do it. Any suggestions? Thanks.
Les
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spippoli
Joined: Nov 23, 2008
Posts: 19
Location: Italia_pizza_mandolino
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| Posted: Wed Nov 18, 2009 3:24 am Post subject:
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| I used switched stereo jacks a couple of times for this. They're jacks with the 3 pins for audio signal plus a DPDT switch activated when you plug it |
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267
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| Posted: Wed Nov 18, 2009 3:43 am Post subject:
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That is so good, spippoli, I didn't anyone made such a thing! I knew about jacks that had switches, but these switches get grounded by the plug, so no good for power. A separate isolated switch is a godsend for this application, thanks.
Les
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spippoli
Joined: Nov 23, 2008
Posts: 19
Location: Italia_pizza_mandolino
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| Posted: Wed Nov 18, 2009 5:41 am Post subject:
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exactly,
the DPDT pins are isolated from the jack.
Unfortunately I buy them from my local supply store and have no reference to online shops.
Anyway the jack is this one:
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267
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| Posted: Wed Nov 18, 2009 5:54 am Post subject:
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Wow, that jack is perfect, I will see if DigiKey sells them...
Les
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Mon Nov 23, 2009 7:04 am Post subject:
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| You don't need a switched jack for this - you can use a normal TRS jack. Connect the '-' post of the battery to the ring lug of the jack and the common of the circuit to the ground lug. Then when you insert a TS plug (make sure it's TS and not a TRS plug!) the circuit for the power will be closed and your circuit will power up. This is the way it's done with stompboxes. |
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267
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| Posted: Mon Nov 23, 2009 1:22 pm Post subject:
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| numbertalk wrote: | | You don't need a switched jack for this - you can use a normal TRS jack. Connect the '-' post of the battery to the ring lug of the jack and the common of the circuit to the ground lug. Then when you insert a TS plug (make sure it's TS and not a TRS plug!) the circuit for the power will be closed and your circuit will power up. This is the way it's done with stompboxes. |
That will work for single supply, but i have +/- 9V supply.
Les
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Mon Nov 23, 2009 7:02 pm Post subject:
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Oops missed that
| Inventor wrote: | | numbertalk wrote: | | You don't need a switched jack for this - you can use a normal TRS jack. Connect the '-' post of the battery to the ring lug of the jack and the common of the circuit to the ground lug. Then when you insert a TS plug (make sure it's TS and not a TRS plug!) the circuit for the power will be closed and your circuit will power up. This is the way it's done with stompboxes. |
That will work for single supply, but i have +/- 9V supply.
Les |
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267
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| Posted: Mon Nov 23, 2009 7:10 pm Post subject:
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| numbertalk wrote: | Oops missed that
| Inventor wrote: | | numbertalk wrote: | | You don't need a switched jack for this - you can use a normal TRS jack. Connect the '-' post of the battery to the ring lug of the jack and the common of the circuit to the ground lug. Then when you insert a TS plug (make sure it's TS and not a TRS plug!) the circuit for the power will be closed and your circuit will power up. This is the way it's done with stompboxes. |
That will work for single supply, but i have +/- 9V supply.
Les |
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Still, I recall seeing a jack that had two switches unless i'm really confused. Maybe that's what that switch is for...
Les
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