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  1. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Can any one else suggest a capacitor size ? Thanks again! -TheChad
  2. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay - The large capacitor: Is it too big? How do I know what the proper size is? I think it was like a 3500uF or something, I changed it to a 4700uF (I don't remember why). What size capacitor would you recommend for the low voltage side? I assume the resistor would be installed on the...
  3. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Soo, if I were to change out my regulators for this: http://www.mouser.com/ProductDetail/STMicroelectronics/MD1803DFP/?qs=sGAEpiMZZMshyDBzk1/Wi50akZ1xmvG3YC1gaKNKA7w= Which is a 10a switching regulator, would that work? or is there more to it then that? No matter what I am going to purchase...
  4. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I'm more in the range of 1-4 amps @ 3-6v. -TheChad
  5. TheChad

    Koford (Slot Car) Bench Power Supply Project

    The switch is built into the potentiometer, it clicks off at the lowest setting on the potentiometer. So typically the amp draw at that setting will be less than 1-2amps.. There is a physical on/off switch that cuts the A/C feed between the wall and the transformer to shut the power off...
  6. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, the transformer that came installed on this power supply was 6.3v 6amps. It did not have enough power, this the reason I installed the larger transformer.. I am never pulling more than 5 amps DC, typically I'm using it in the range of 3-6 volts DC, but need the ability to go up to about...
  7. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Which is probably why the put a potentiometer with built in switch! Which I Bypassed because I wanted power when the knob was off to power the Digital volt/amp meter I just installed! Looking at it, I think If I just install the positive test lead to the switch, It'll cut power as needed! Is...
  8. TheChad

    Koford (Slot Car) Bench Power Supply Project

    LOL, I have a little better way.. Digital Laser Thermometer! Right now I am installing a new Digital Volt/Amp meter so I have wires everywhere.. Tomorrow I hope to get it all put back together and I can run some real tests. The case has never been soo hot I felt like I burned my hand...
  9. TheChad

    Koford (Slot Car) Bench Power Supply Project

    The power supply must be variable. I have to be able to set the voltage depending on what I am doing, Breaking in a motor, reving a motor to check for amp spikes, running an armature or tire lathe.. I really don't use the power supply for long periods of time, but when I do, typically it's...
  10. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Thanks for all the information guys! So it sounds like the best solution is really to reduce the transformer, because I am creating unnecessary heat by having 12.6v, especially when 90% of the time I'm using it at less than 6v.. The model of the transformer I installed is this...
  11. TheChad

    Koford (Slot Car) Bench Power Supply Project

    It goes from about ~3v to ~12v. It's a 1k Potentiometer I don't know if the caulk like material they used is thermo or not.. I went to radio shack (It's the only place anywhere in Central Illinois that sells anything electronics related!) and bought some Silicon Thermo Compound...
  12. TheChad

    Koford (Slot Car) Bench Power Supply Project

    They are attached to the bottom of the case with either caulk or thermo sealant, it's a silver caulk like material... This was done from the manufacturer.. If I separated them, I could install a heat sink on each of them. But it would still be on the inside of the case with no fan.. It is a...
  13. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Thanks soo much for the information! I didn't think of it like that, I was thinking on the line that I was pushing them too hard causing more heat! A fan is not possible as the power supply case is small. I am afraid the switch mode option may be a bit too much for me to take on! I will...
  14. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Hi, Let me start off by introducing myself! My name is Chad. I had several years of electronics classes 10+ years ago but I went threw stage 4 cancer/chemo which wiped out most of the knowledge I had of electronics! Though I typically begin picking up on the things that were wiped pretty...
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