| Electronics > Projects, Designs, and Technical Stuff |
| A 6,35mm / 1/4" Telefone Jack with a normaly open Contact/Switch |
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| Detzi:
Good day, i want to build an, battery powered, audio preamp for my passive e-violin. I'd like to use 6,35mm Telefone-Connector, since they are (seem to be) the standard, and i'd also like to make the device as small as possible. Now to turn the thing on i originally wanted to use a small dip switch, but it occured to me that the Telefone-Jack i have here has already three but "NC" Switches. This Article talks about "normally open, Singe Pull Double Throw (SPDT), and Double Pole Double Throw (DPDT)" Switches. If there are 6,35mm Jacks with "NO" contacts, i could make a much more conveniant ON/OFF switch. So i called up "Neutrik" and they said it is an unusual thing to have, and they don't have such a jack. Is anyone aware that such a 6,35mm Jack exists? Where are these NO-Contacts normally used? In 3,5mm Headset jacks? Thanks in advance! Detzi |
| tooki:
Maybe just use an open frame jack and then mount a separate microswitch that is depressed by the plug? |
| jhpadjustable:
On-board preamps commonly use a stereo jack with battery - on the ring and circuit ground on the sleeve. A mono plug shorts them together and connects power to the circuit. |
| Detzi:
--- Quote from: tooki on November 28, 2019, 12:46:38 pm ---Maybe just use an open frame jack and then mount a separate microswitch that is depressed by the plug? --- End quote --- I like that idea, i will have a look at it if i can't find a NO-Jack. --- Quote from: jhpadjustable on November 28, 2019, 02:23:15 pm ---On-board preamps commonly use a stereo jack with battery - on the ring and circuit ground on the sleeve. A mono plug shorts them together and connects power to the circuit. --- End quote --- That's true and i already had that thought, but when a Stereo-Plug is inserted, it would just not work anymore. I did not mention that i'd like to use the preamp either to connect to my HiFi-Receiver, or to my Headphones. Which guarantees a stereo Plug is used sometimes. |
| jhpadjustable:
If it's just for a one-off, maybe this would do. eBay auction: #333374204369 If you could get the seller to ship overseas, that is. |
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