| Author |
Message |
    
Red_chili
| | Posted on Friday, September 26, 2008 - 06:05 pm: | 
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But you have to sell them cheaper than the Kuryakin LED voltmeter to start your empire...
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Reepicheep
| | Posted on Friday, September 26, 2008 - 07:10 pm: |
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Maybe if I put my kids to work in my own personal sweat shop  |
Oldog
| | Posted on Sunday, September 28, 2008 - 10:35 am: |
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I go looking for my '08 headlight posts
and find this 
Scope creep. It gets less simple by the moment. I blame Oldog.
At your service..
I have yet to build the unit, I need to get a bench top 12v supply, your multi led units are likley similar to the bargraph types except that they use fixed resistors
"when in doubt the holes are slots and the resistors are pots"} |
Reepicheep
| | Posted on Monday, September 29, 2008 - 07:14 am: |
|
It's easy to whip up a variable bench supply with an LM317 (Radio Shack has them) and a big (knob type) 5k resistor. You also want a big heat sink on it. Thats what Ben and I made for this project. I used an old transformer from a long gone HP deskjet, which puts out 30V DC.
I have to get another one of those lm317's, I want to see if I can make a new charger for an old (but nice) Ryobi 12v drill I have laying around. I'm tired of throwing these things away. |
H2owerker
| | Posted on Friday, October 03, 2008 - 05:39 pm: |
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Anybody know how good those little simple wiper pots hold a setting over time? I can seal them from the elements, but they will still see a lot of temperature cycles. Will they hold up?
They should. There were a couple in the car stereo that I plundered to get my 16v capacitors for the head light delay module. I've also seen them in industrial control circuits subjected to huge temperature swings, and nasty environmental conditions. On the industrial equipment most of them have had a small dab of paint applied to "lock" the setting and keep the vibration from migrating the wiper. That's what I did to mine. |
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