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Thread: 12V controller box

  1. #1
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    Default 12V controller box



    Here's my 16AH power supply & 3 circuit variable controller I made for my XT8 based on a cheap RGB led dimmer.
    I ended up with 52K for the led's to get them dim enough. Added a voltage meter and 5V usb outlet for good measure. I had to put some neutral density filter on the meter to get it to dim down.
    Used 2 AGM batteries in parallel, made an adapter to charge from my battery tender. I also added a used computer fan I had in the junk drawer, it works well but makes a little electronic whine at very slow speeds, might have to splurge $3 on a new one.
    I ran it for 4 hours the other night and the batteries were only down 20% or so.
    The wiring is pretty sloppy, but it was inexpensive, works well and didn't take too long.



  2. #2
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    Default Re: 12V controller box

    I like your attempt very much , looks pretty solid to me .
    I don,t consider the wiring sloppy at all ,ya can,t see it anyway .
    I love individual innovation --keep at it.

    admiring Dan

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    Default Re: 12V controller box

    That's pretty impressive, I've had ideas for a eq- platform but , the funds gotta come from somewhere and I keep shaking my money tree and all I get is insufficient funds.DSCN0393.JPG I do like the concept. Kudos

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    Default Re: 12V controller box

    Thanks for the nice comments.
    I like fiddling with stuff like this, and learn a little more about lectricity each time I do.
    The component parts are actually quite cheap ordering directly from China on ali express or similar, it just takes a few weeks to get here in the mail.
    I spent about $40 for parts, but I got quite a few bits left over for the next little electric project.

  5. #5
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    Default Re: 12V controller box

    Nice build. Thanks for sharing that.

    I plan on doing something like that as my new interest in astronomy becomes a commitment.


    This is NOT an ad, just sharing some info.
    If you want a decent PWM controller that is available, this is something that I have used as a small motor controller and I have it in my head that it would be an excellent dew heater controller as well:

    Amazon.com: RioRand™ Upgraded 6V-90V 15A DC Motor Pump Speed Controller: Computers & Accessories

    Again, not affiliated and have no interest in Amazon or the manufacturer.

  6. #6
    Hilbily's Avatar
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    Default Re: 12V controller box

    That controller defiantly looks better and is more heavy duty at 15 amps.
    This one is only 3amps per channel, I'm thinking that will be enough for dew control, but i don't know if I will even need any yet.
    Would that 15amp controller still make the little whine I described coming from the fan motor at low speeds?
    I can barely hear the whine unless I have my ear close to the computer fan.
    It is similar to the low speed whine I had on a VFD I put on my wood lathe, but I was able to change the carrier frequency in the VFD and it went away.

  7. #7
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    Default Re: 12V controller box

    That controller is said to be 15kHz which should be a high enough frequency that humans shouldn't hear it.
    Only exception human ears can hear as high as 20,000 afaik.
    Do you know what frequency your led controller runs?
    Hilbily likes this.

  8. #8
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    Default Re: 12V controller box

    No Idea what frequency it is, if I hook a small incandescent or led light to it , it doesn't pulse or strobe on low.
    Lack of specs or an exact description on some items is the downside of ordering a $9 item from chopstick land.
    I'll be making a eyepiece nichrome dew band to try next, as It got dewed up last night causing an end to the fun.
    Mike
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  9. #9
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    Default Re: 12V controller box

    Frequency won't matter for a resistance load (unless it introduced noise into other electronics nearby).

 

 

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