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Holiday Special 19
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Holiday Special 19
Blog Christmas Spirit Crank
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  • Author Author: garengllc
  • Date Created: 29 Dec 2019 12:35 AM Date Created
  • Views 1133 views
  • Likes 4 likes
  • Comments 5 comments
  • holidayspecial19ch
  • holidayspecial19ch.
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Christmas Spirit Crank

garengllc
garengllc
29 Dec 2019

OK, as promised, here is a simple schematic (pretty stripped down as I didn't have time to dust off Orcad).  I tried to lay it out so that it can be followed left to right, top to bottom.  I think I captured most of the big points, but please point out something if you think I missed it (or have a question).

 

SCHEMATIC IS JUNK FOR BEING A COTTON HEADED NINNY MUGGINS! WILL ADD A LINK TO AN UPDATED ONE WHEN I POST. LEAVING THIS UP AS A LEARNING EXERCISE, DO NOT USE!

 

Here is the updated schematic: Christmas Spirit-tron updated schematic (Christmas Spirit Meter)

Attachments:
image
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Top Comments

  • jw0752
    jw0752 over 5 years ago +2
    Hi Jason, I suspect you will want the LEDs above the MOSFETS so that your gate voltage doesn't have to be so high. If the Source of the MOSFET is at ground and the Drain of the MOSFET is being supplied…
  • jw0752
    jw0752 over 5 years ago +2
    Hi Jason, I noticed one other thing that you may want to look into. The LM3914 is designed to turn on LEDs by pulling the outputs low. This means that you will need pull up resistors on each of your outputs…
  • jw0752
    jw0752 over 5 years ago +2
    Here is an example of what I was talking about. I am not an expert and once the other guys check out your posting they may say you were right and my ideas are off. The guys will also perhaps have suggestions…
  • garengllc
    garengllc over 5 years ago in reply to jw0752

    Here is an updated schematic with explanation:

    Christmas Spirit-tron updated schematic (Christmas Spirit Meter)

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  • garengllc
    garengllc over 5 years ago in reply to jw0752

    Thanks for the time John.  You are right on many points.  Full disclosure, I am off visiting my in-laws and figured I might have some "work" that needed to get done image , so I was attempting to recreate it from memory and the youtube videos.  I should pop off the enclosure when I get home and take some good pics for everyone (and me).

     

    I made a ton of mistakes and you were absolutely correct just by looking at it.  Let me do some more "work" and clean this up the best I can.  I apologize as this was a poor way of releasing information.  Look for an update soonly!

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  • jw0752
    jw0752 over 5 years ago

    Here is an example of what I was talking about. I am not an expert and once the other guys check out your posting they may say you were right and my ideas are off. The guys will also perhaps have suggestions for the values of the resistors for the pull up and buffers between the 3914 and the 7414 and the MOSFET. I would tell you what I have used but it would just be a guess.

     

    image

     

    John

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  • jw0752
    jw0752 over 5 years ago

    Hi Jason,

     

    I noticed one other thing that you may want to look into. The LM3914 is designed to turn on LEDs by pulling the outputs low. This means that you will need pull up resistors on each of your outputs and an inverter  between the LM3914 and your MOSFETs if you want the MOSFETs to turn on the LEDS in the same manner that the original LM3914 did.

     

    John

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  • jw0752
    jw0752 over 5 years ago

    Hi Jason,

     

    I suspect you will want the LEDs above the MOSFETS so that your gate voltage doesn't have to be so high. If the Source of the MOSFET is at ground and the Drain of the MOSFET is being supplied by the cathodes of the LEDs then a digital high from the 3914 to the Gates will turn the MOSFETS on.

     

    John

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