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  •  » Calling on electrical gurus need to make a new cvr

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    3/03/2022 3:38 PM  #1

    Greg B
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    Calling on electrical gurus need to make a new cvr

    Years ago I made up some constant voltage regulators with I believe it was a lm117??? module? It was black with 3 prongs.   Anyways, can't find where I stored them, or if I got rid of them over the years, but need to make a new one.  What you gurus think about using this?

    https://www.amazon.com/gp/product/B076H3XHXP/ref=ox_sc_saved_title_1?smid=A3JJM7S8SDXVXM&th=1

    Last edited by Greg B (3/03/2022 3:39 PM)

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
     

    3/03/2022 5:20 PM  #2

    Nos681
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    From: Atlantic Mine, Michigan
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    Re: Calling on electrical gurus need to make a new cvr

    I’ve never used one.

    Looks easy to use and adjust.

    Didn’t notice the maximum current output, if that matters for your project.
    That’s my input😂

     

    3/03/2022 5:51 PM  #3

    Rudi
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    From: Stuck in the 50's Welland Ca
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    Re: Calling on electrical gurus need to make a new cvr

    Years ago when I still had factory gauges a made a couple using LM338 ic’s.
    I don’t see why the Amazon ones would not work, probably cost that much to make the ones I did.

    Last edited by Rudi (3/03/2022 5:55 PM)

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    3/03/2022 8:06 PM  #4

    Bullet Bob
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    Re: Calling on electrical gurus need to make a new cvr

    I use those...or similar...all the time.  Got two in the heap and a couple more in the Falcon plus I've given away a bunch of them.  They work good and you can adjust your stock instruments to read at "center normal" if you wish.
    Last time I decided to build one the cost of parts and shipping was going to be at least twice what I could buy a dozen of these for.
    I think I have a few on hand so if you'll PM your mailing addy to me I'll send you a couple, Greg.
     

    Last edited by Bullet Bob (3/03/2022 8:07 PM)

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    3/04/2022 9:06 AM  #5

    BobE
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    Re: Calling on electrical gurus need to make a new cvr

    Not sure this helps however, I have one of these (not sure if it is the same brand) that I got from Amazon. I use it to 'bench check' gauges, LEDs, circuit's, etc..  I haven't burned it out yet, but it is not in constant use. 

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    3/04/2022 1:31 PM  #6

    Ron68
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    Re: Calling on electrical gurus need to make a new cvr

    Bullet Bob wrote:

    I use those...or similar...all the time.  Got two in the heap and a couple more in the Falcon plus I've given away a bunch of them.  They work good and you can adjust your stock instruments to read at "center normal" if you wish.
    Last time I decided to build one the cost of parts and shipping was going to be at least twice what I could buy a dozen of these for.
    I think I have a few on hand so if you'll PM your mailing addy to me I'll send you a couple, Greg.
     

    I used the ones BB has installed. I put three in for fuel quantity, water temp and oil pressure. Set them so that they are at mid range when normally operating and I used his template and instructions to set my fuel quantity on the white line near the "E" when I have two gallons left in the tank. The units are pretty cheap - I ordered a set and still have some I didn't need left. He can supply you with the information and part numbers.

    68 coupe - 351W, 4R70W, 9" 3.25 -- 65 convertible - 289 4v, C4, 8" 3.00
     

    3/04/2022 3:45 PM  #7

    Nos681
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    Re: Calling on electrical gurus need to make a new cvr

    https://fyi.boardhost.com/viewtopic.php?id=8251


    I did something similar to JamesW idea.
    I added a set of capacitors between “input and ground” and “output and ground”.
    My thoughts were to minimize voltage fluctuations going in and out.
    I also mounted voltage regulator on a heat sink.

     

    3/04/2022 5:12 PM  #8

    wsinsle
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    Re: Calling on electrical gurus need to make a new cvr

    The only issue with the adjustable voltage supply is the gauges react slower. With an original CVR the gas gauge reacts fast when you turn on the key. With a 5 volt adjustable out put it takes a few seconds to react. Not really a big deal. I have a design scratched on paper that can adjust a 12 volt pulse to simulate a 5 volt supply. This is like the original but adjustable. If anyone is interested, I can make a prototype and post the diagram. Parts would only cost a few bucks.

    If this forum can't fix it, it isn't broke.
     

    3/04/2022 7:53 PM  #9

    Nos681
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    From: Atlantic Mine, Michigan
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    Re: Calling on electrical gurus need to make a new cvr

    I realize there is no adjustments, wasn’t looking for accuracy, just function.
    I just used a couple of capacitors to buffer voltage spikes in and out.
    KISS…for me…I’m no electronics engineer.

    The capacitors were off an old power supply circuit board.
    They could have been smaller in capacitance.

    When ignition is turned on/off, gauges move slowly as capacitors charge/discharge.
    I used 3 pigtail leads to connect and appropriate wire connectors as needed.

    Edit:  this is voltage regulator I am using. https://www.nteinc.com/specs/900to999/pdf/nte960.pdf





    Last edited by Nos681 (3/06/2022 9:02 AM)

     

    3/08/2022 11:10 AM  #10

    Greg B
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    Re: Calling on electrical gurus need to make a new cvr



    I got them in the mail first thing this morning.  Thank you!

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
       •Thread Starter
     

    3/08/2022 1:38 PM  #11

    Rudi
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    From: Stuck in the 50's Welland Ca
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    Re: Calling on electrical gurus need to make a new cvr

    Greg B wrote:



    I got them in the mail first thing this morning.  Thank you!

     
    Make sure to bench test them, Chinee quality control is non existent.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    3/10/2022 10:59 AM  #12

    jerryF
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    From: Franklin, Tn.
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    Re: Calling on electrical gurus need to make a new cvr

    I would fuse the +12 lead with a small fuse.  I had a cheap adjustable regulator short and burn some wiring.    The regulator I have now is:  https://www.amazon.com/gp/product/B00C0KL1OM.  It works great so far.
     

    jerry
     

     

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