Question about Cobra 29 LTD CB Radio

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Hi, I have a Cobra 29 NW ST CB Radio and I was wondering something about changing the stock burnt out bulb to an LED. Does it matter which wire goes to the negative side of the LED and which one is the negative one on the radio side of things anyways?? Also, which wire gets the resistor?? Thanks in advance...

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If you're going to replace a 12VDC incandesant light bulb with an LED, you MUST connect a series resistor in line with the LED and observe polarity as LED's can only be hooked up one way. Depending on the size and color of the LED, An average size red orange yellow or green one for instance, you would use between a 1000, (1Kohm), and a 1200, (1.2Kohm) resistor. These LED's usually require about 1.7VDC at 20 Ma. There are some of the newer white LED's that require feom 3 to 6VDC in which case you'd use a lower value. The blue ones that are somewhat popular now I've had no experience with so get a spec. sheet if you use these.
Good luck.
Jeff

Posted on Feb 09, 2011

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LED's do matter how they're installed.
Test your LED leads w/ a batt. first before soldering in you 29 board.

Look at you existing leads from you burnt out bulb. One red?
Then its your Pos terminal. when your LED lights up on your Batt. test you'll know which one is the POS/NEG legs. then resolder it into your board.

Mike

Posted on Dec 31, 2010

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