| 48V patch points [message #359999] |
Sun, 27 July 2008 15:54  |
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 J.J. Blair
Messages: 12680
Registered: May 2004
Location: by the sea & sand |
Diamond Member |
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I have a couple of mic pres that don't have 48V built in, and I was thinking of putting some 48V spots in the patch bay, so I can just patch into phantom if I need to, ahead of these pres. Does anybody have a suggestion for the best way to do this?
studio info
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| Re: 48V patch points [message #360019 is a reply to message #360009 ] |
Sun, 27 July 2008 18:20  |
 ssltech
Messages: 4265
Registered: May 2004
Location: Florida (previously UK) |
Platinum Member |
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Basically the following works:
two sockets, grounds linked, with a pair of 10µF capacitors joining the two hots, and the two colds. -Then two 6.8kΩ quarter-Watt 1% resistors from the hot and cold on the TO MICROPHONE connector, coming from your 48V feed.
That's basically what'll be inside the Apex box, also.
You can make your own box if you use a small 20-0-20 transformer, a bridge rectifier, a smoothing cap and an LM317 type regulator circuit... -That way it's portable, if that's of any value to you.
-Remember to caution people agains patching ribbons etc. into it of course.
Keith
| MDM (maxdimario) wrote on Fri, 16 November 2007 21:36 |
I have the feeling that I have more experience in my little finger than you do in your whole body about audio electronics..
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| Re: 48V patch points [message #360401 is a reply to message #360146 ] |
Tue, 29 July 2008 09:05 |
ssltech
Messages: 4265
Registered: May 2004
Location: Florida (previously UK) |
Platinum Member |
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| CHANCE wrote on Mon, 28 July 2008 12:36 |
| J.J. Blair wrote on Sun, 27 July 2008 23:53 |
Dave, it was so simple, and I didn't even realize it. I just figured it all out. Thanks!
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Care to share?
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JJ is (I'm fairly certain) referring to just wiring it to the patchbay, as Dave suggested.
Keith
| MDM (maxdimario) wrote on Fri, 16 November 2007 21:36 |
I have the feeling that I have more experience in my little finger than you do in your whole body about audio electronics..
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| Re: 48V patch points [message #360410 is a reply to message #360401 ] |
Tue, 29 July 2008 09:37 |
Jim Williams
Messages: 954
Registered: May 2005
Location: beautiful carlsbad, CA |
Gold Member |
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If you do wire phantom hot patch points in a bay, make sure you have an on/off switch for it. I remember several studios in LA back in the early 80's that had mic patch points on the bays. We would turn off the lights when patching just to see the sparks when the tips touched the sleeves.
Jim Williams
Audio Upgrades
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| Re: 48V patch points [message #361962 is a reply to message #360743 ] |
Mon, 04 August 2008 11:05 |
drknob
Messages: 107
Registered: February 2005
Location: Montreal, QC |
Active Member |
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On the O'Henry console, we made a custom circuit board to fit the rear of a Mosses & Mitchell bay with 48 switches, 96 6k8 resistors and 48 leds with current limiting resistors. No capacitors were used since the mic pre in was a Jensen xformer. Leds are a good reminder that phantom is engaged.
Harold Kilianski
CIRMMT, McGill University
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