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Old 3rd October 2007, 04:48 PM   #1
xbox540 is offline xbox540  United States
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Default adding LEDs to amp head

hey guys, does anybody know how to add those little LED lights to an amp head? i have a peavey ultra 60 head and i want to add lights to it to make it look cool. how would you go about wiring those in?
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Old 4th October 2007, 01:56 AM   #2
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LED Stuff:

Run them from the tube heater 6.3V AC supply.

LEDS are inherently a diode so will conduct only on one half cycle.

LEDS have a forward voltage drop of around 2.0 volts (blue leds drop a little more and red leds drop a little less, green leds in the middle).

LEDS have very low reverse voltage break down so protect them with a series power diode (like a bog standard 1N4007) with the same polarity as the LED.

add series resitor to limit LED current to say 10 to 15 mA
Calc:
6.3V - 2.0 volts = 4.3 V to be dropped across the resistor.
4.3V / 10mA = 430 Ohms

So for each LEd you add you want a series string:
1/ one side of heater to anode of power diode
2/ cathode of power diode to anode of LED
3/ cathode of LED to current set resistor (390 Ohms for bright, 470 or 560 or even 680 Ohms for less bright)
4/ other side of resistor to other side of heater supply.

If you are using multiple of these wire each alternative "set" to the heater wiring reversed with respect to the 1st so that it conducts on the opposite half cycle of the heater supply.

Cheers,
Ian
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Old 4th October 2007, 04:06 AM   #3
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Heres a cool thing I did with my amp.

http://getchellaudio.googlepages.com...00732-full.jpg

Its relatively easy to do. I used a small bridge rectifier from the 6.3vac and a current dropping resistor ( seem to recall 4.7k?) and a small BRIGHT blue led. While engraving my name with a dremel was hard to do, it is in theory simple. Carve any design midway into the plexiglass and then stick a LED at each end ( or one in my case) and it will light up the engraved part. I think Hughs and keffner use the same type of thing for their amps.
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Old 4th October 2007, 06:56 AM   #4
xbox540 is offline xbox540  United States
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all right guys thanks for the info ill give it a try, and if i succeed this will be one cool project.....
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Old 4th October 2007, 11:13 AM   #5
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Blue LEDs are best (in my eyes), but here I have enhanced my 50CA10 with yellow LEDs:

Click the image to open in full size.

And this is next project - red LEDs to enlighten a pair of 829:

Click the image to open in full size.

Here I use a massive 10mm led.
I have found out that blue LEDS helps the elctrons move smother from cathode to anode thereby enhancing the sound a lot - firmer bass, crispier treble and much more transparent midrange. My 50CA10 sounds a bit murky due to the yellow light, but I can accept that, just for the look....

And a pair of GU50 with blue LEDs:

Click the image to open in full size.
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