Copper Talk » Ask The Tech » Microphone Wiring » Powered pins at mic socket for desk mics???? « Previous Next »

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Slim1
Posted on Thursday, January 23, 2003 - 12:42 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

how would a fella go about using these "powered pins" for powering a power mic? my DX2547 has the 8VDC at one of the pins,and i thought it would be nice to use it to power my desk mics! also,like the delta force,how would you knock down the voltage from 13.8VDC to 8-9VDC for the same
purpose? any input/help is appreciated!thanks,SLIM-CDX285
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Tech808
Posted on Thursday, January 23, 2003 - 7:16 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Slim1,

What I have done for powering Desk Mics is get an old power supply for a cordless phone 9 Volt.

Then wire it to battery connector in mic and then run the cord from it thru the coils of the desk mic and plug other end into wall.

Very simple 5 minute hook up and much easier.

And that allows you to still use the Mic on any radio without a battery.

Has worked good for me and others.

Lon
Tech808
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Sg569
Intermediate Member
Username: Sg569

Post Number: 209
Registered: 12-2004
Posted on Friday, August 12, 2005 - 6:22 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Darn good idea, 808.
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Hollowpoint445
Advanced Member
Username: Hollowpoint445

Post Number: 649
Registered: 6-2004
Posted on Friday, August 12, 2005 - 7:49 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Solder an unused wire in the microphone cord from the the powered pin to the +v terminal on the microphone's amplifier board.

If you want to drop the voltage you could use a resistor (P=IxE) or some diodes in series to drop the voltage but I don't think the voltage difference would be a problem. The output control on most microphones varies the voltage to control the amplification level, so just cut it back a little more.

Using an external supply could lead to ground loop issues or give RF another way to get into the microphone. If the radio has a powered pin in the microphone jack use it.
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Twowatt
Member
Username: Twowatt

Post Number: 55
Registered: 7-2005
Posted on Saturday, August 13, 2005 - 10:01 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

slim1, or use one 5.1v (or 5.6v) zener reverse bias (like a zener normally is) in series with the +v lead.

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