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  1. TheChad

    Koford (Slot Car) Bench Power Supply Project

    A pair of transistors? -TheChad
  2. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I think the simple solution is to just put a resistor between the capacitor and the meter power + .. Right? But what value? -TheChad
  3. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I have not gotten to the new capacitor on the output side of the voltage regulator..... I'm not even sure If I will need that one yet... I am talking about the large smoothing capacitor on the output of the bridge rectifier. 30-seconds is acceptable, the only problem that it causes, is...
  4. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, I connected the 1MΩ 1/2-watt resistor between the + & - terminals on the capacitor and found there was little to no difference what so ever in how long it took for the capacitor to drain the voltage off.. I also tried a 20k 1/4-watt resistor, with the same results... It takes about ~30...
  5. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Yes, I used a bathroom type sealant, An Indoor/Outdoor silicone caulk... I gave it well over 24 hours to dry and while it was dryish, it was still soft and uncured... The hot glue, was hard, but the components pulled right up with little effort.. When Koford is manufacturing these power...
  6. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I need to adhere the Capacitor, it's a PCB mount, so it needs to be adhered to the bottom of the case and the wires are soldered to the top. I also need to adhere the Rectifier... So it's 1" x 1" metal. to the Metal power supply case.. -TheChad
  7. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Well, I tried silicone, It didn't seem to want to hold. I also just tried hot glue in which it didn't want to hold either.... I don't know if my wife's small craft hot glue gun maybe didn't get hot enough? but I wonder too if the components wouldn't get too got and actually re-melt the...
  8. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, so I have gotten everything re-installed, except for the rectifier and the new main capacitor... They were caulked down to the case, which was suggested before as a bad idea..... That said, the heat produced now should be MUCH less and caulking/gluing them down is the only option I...
  9. TheChad

    Koford (Slot Car) Bench Power Supply Project

    A 10k ohm will drain it faster than a 1Meg Ohm!? I'm not too worried about wasted power, especially because it's not very much and he transformer is as you know oversized! -TheChad
  10. TheChad

    Koford (Slot Car) Bench Power Supply Project

    You originally suggested a 1Meg Ohm resistor, I purchased some of those. Should I exchange them for a 10k? Thanks, -TheChad
  11. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Nothing was connected wrong, that I know. I even tried moving all the pins around. Either way, I guess at this point it doesn't matter as I've re-soldered the original potentiometer back into the board and connected just the 2 wires from the external potentiometer. (See Picture). Here is...
  12. TheChad

    Koford (Slot Car) Bench Power Supply Project

    What could be connected wrong? I tried moving all 3 pins around and the same results.... When the potentiometer get's to 50%, the voltage stops climbing and begins to go back down.... Which makes since in that it's pulling the resistance off the other side at 50%.... You can't really tell by...
  13. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Should I try shorting the 2 outside pin's? I'm pretty sure it is only using the potentiometer to compare resistance.. Connecting all 3 pins obviously doesn't work.. so either it's only using 2 pins, or the 3rd pin is shorted to the 1st pin? At 12v the potentiometer measures 16,300Ω...
  14. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay! So I got the parts in... I got the DC/DC Converter board installed, I got the built in rheostat removed and wire leads soldered in... I temporarily connected the new 50k ohm rheostat for testing.. There are 3 leads from the board, 3 pin's on the rheostat I removed from the board and...
  15. TheChad

    Koford (Slot Car) Bench Power Supply Project

    But the switch mode converter is AFTER the rectifier in the circuit... So wouldn't that make the rectifier still be doing the same amount of work? -TheChad
  16. TheChad

    Koford (Slot Car) Bench Power Supply Project

    It is mounted (well caulked) to the bottom of the power supply case.. I'm still looking for that darn infrared temp gun, but it was hot enough that after 5-10 seconds It wasn't comfortable to leave my finger on it still. -TheChad
  17. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, while I am awaiting the DC/DC Converter module.. I was using the power supply to break in a motor drawing 1.3A @ 4v. Of course the regulators got hot, as we already know.. But the Bridge Rectifier also got hot. I know Bridge Rectifier's don't run cool. Would changing the Rectifier...
  18. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, yeah that's what I was going by also... I didn't know if maybe you had this module or something... I will wait till it shows up to order the potentiometer just to make sure it's right.. Thanks, -TheChad
  19. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, Going with a 12000uF 25v Capacitor... Any objections, Thoughts, Opinions? Thanks! -TheChad
  20. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Will definitely!
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