Author |
Message |
Slim1
| Posted on Thursday, January 23, 2003 - 12:42 am: |
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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 |
Tech808
| Posted on Thursday, January 23, 2003 - 7:16 pm: |
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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 |
Sg569
Intermediate Member Username: Sg569
Post Number: 209 Registered: 12-2004
| Posted on Friday, August 12, 2005 - 6:22 pm: |
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Darn good idea, 808. |
Hollowpoint445
Advanced Member Username: Hollowpoint445
Post Number: 649 Registered: 6-2004
| Posted on Friday, August 12, 2005 - 7:49 pm: |
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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. |
Twowatt
Member Username: Twowatt
Post Number: 55 Registered: 7-2005
| Posted on Saturday, August 13, 2005 - 10:01 pm: |
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slim1, or use one 5.1v (or 5.6v) zener reverse bias (like a zener normally is) in series with the +v lead. |