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Author Topic: AL-811 Dial Light voltage?  (Read 1232 times)
W5CPT
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Posts: 556




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« on: April 01, 2013, 06:33:56 AM »

The meter lights are out on my AL-811. I am going to replace them with LEDs.  What is the voltage applied to the lights?  I have checked everything I know – schematic – parts list – googled every source I can think of.  I want to get the circuit figured out before I take the amp apart, but I need to know what the supply voltage is, to figure out the current limiting resistor value and have all the parts before I open the case.

Clint – W5CPT -
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W1QJ
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Posts: 1438




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« Reply #1 on: April 01, 2013, 08:00:52 AM »

Typically they are 12v lamps.
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AA4PB
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« Reply #2 on: April 01, 2013, 08:33:58 AM »

http://www.ebay.com/itm/Ameritron-Meter-Lamp-LED-Replacement-Set-in-Blue-Green-Red-White-or-Yellow-/130878444704?pt=LH_DefaultDomain_0&hash=item1e78f694a0

These are 12V.
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K8AXW
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« Reply #3 on: April 01, 2013, 08:45:59 AM »

4PB:  These are great strips but the price at Amazon.com is out of line.  The same thing can be bought at Allelectronics.com for less than 1/4 of that cost.  Not only that but the strips can be bought in any length desired. 

I use them to illuminate my LCD screens on homebrew projects. 
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AA4PB
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« Reply #4 on: April 01, 2013, 11:08:14 AM »

I didn't shop prices - I just offered that up as a quick verification that the voltage is 12V.
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W5CPT
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« Reply #5 on: April 01, 2013, 04:25:18 PM »

Thanks - I already have the LEDs and a bin full or resistors.  I just needed the voltage so I can calculate the current limiting resistors.  I did not want to take the amp apart, measure the voltage and then leave it apart till I got the resistor I need if I fail to find one in the parts bins.

Clint - W5CPT -
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K4RVN
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Posts: 757




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« Reply #6 on: April 01, 2013, 08:47:07 PM »

Clint when you get it worked out, please post the wattage and value you used. I have my leds also but don't know how bright they will be unless I try a few resistors and voltages to suit my taste.
I would appreciate seeing what you end up with. My leds are 12 volt.

Frank
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K8AXW
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« Reply #7 on: April 01, 2013, 08:50:17 PM »

4PB:  Sorry!  I really didn't mean to address that comment to you.  I meant to send it to CPT for his consideration.  I'd like to add that these "strips" come with their own dropping resistors and 12VDC or less can be applied to them directly.  They can be dimmed simply by lowering the voltage.
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