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  1. TheChad

    Koford (Slot Car) Bench Power Supply Project

    DC
  2. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Why would I get a 0v reading when touching the center tap -> Diode and another leg from the transformer? What am I missing? Was the diode suppose to be on the negative side? -TheChad
  3. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, I just tried connecting it the way you suggested... Center tap->Diode->Positive lead on meter | Other lead from transformer-> Negative lead on meter... Zero Volts. When I check with the volt meter. Touching the other side of the diode and one of the other taps on the transformer I get...
  4. TheChad

    Koford (Slot Car) Bench Power Supply Project

    We did... The meter does have a completely seperate power than the inputs for reading voltage and current... But connecting only the red (positive) to the power for the meter, powers the meter...
  5. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, I guess I'll stick with the 100uF.. I just thought of something... I soldered the diode to the center tap on the transformer, then connected the positive terminal from the meter to the other end of the diode... But I connected the negative terminal from the meter to the negative terminal...
  6. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, well I went to Radio Shack and they don't have a 220uF capacitor.. They only had 100uF then jumped to 470uF.. How important is getting a 220uF capacitor vs using the 100uF? I can order one if I need to.. I could install another diode on the negative terminal, which would create a full...
  7. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I said in the last post that the voltage after rectification measures 8.61v, I don't know if this makes any difference, but to correct that statement.. Voltage after rectification (no capacitor) measures ~7.32v, Voltage after rectification (w/capacitor) measures ~8.61v. -TheChad
  8. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay! So I went and picked up the diode. I connected everything (with test leads) and took some measurements. The voltage out of the center tap after rectification measures 8.61v, so with what (*steve*) said, the ripple is dropping down to ~4.61v, which is just over the 4.5v required for the...
  9. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I will go to Radio Shack tomarrow and pick up the diode and give it a try! -TheChad
  10. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, seems simple enough, how do we know/verify what size capacitor is sufficient? -TheChad
  11. TheChad

    Koford (Slot Car) Bench Power Supply Project

    The operating current for the meter is <20mA according to the spec sheet. The meter has an operating voltage range from 4.5v - 30v. Would it even need the capacitor...
  12. TheChad

    Koford (Slot Car) Bench Power Supply Project

    http://datasheet.octopart.com/PCLH-206A1S-Tyco-Electronics-datasheet-15179.pdf I don't have many parts laying around... My Inventory consists of: 1. 100x - 0.25w 20k ohm Resistors 2. 4x - 0.5w 1-Mag ohm Resistors 3. 4x - 1w 100 Ohm Resistor 4. 1x - 100uF 35VDC Capacitor 5. 1x - 4700uF 35VDC...
  13. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Yeah, I'm very analytical, I often over analyze things, I will do something, it will work, but I'll wonder if I could have or should have done it differently, even if the same result is achieved. But I always try to do things the correct way, never 1/2-ass it or do something wrong just because...
  14. TheChad

    Koford (Slot Car) Bench Power Supply Project

    So, connecting two 100Ω resistors end to end (series?) gives me ~200Ω.... Connecting two 100Ω resistors + to + and - to - (parallel?) gives me ~50Ω? Is that right? That's what I measured with the ohm meter... I am thinking in terms of batteries, If you connect batteries in Series they...
  15. TheChad

    Koford (Slot Car) Bench Power Supply Project

    I just connected to 100Ω 5w resistors end to end (Series?) and they both only get barely above warm. I held them in my hand with no need to let go of them from the heat. They drain off the capacitor in ~5 seconds which is perfectly acceptable. I think this will work. -TheChad
  16. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay, so RadioShack had several Relay's on clearance, I picked up a couple, I don't know if either will work or not, but I figured for a couple of $'s, I can always take them back if I don't use them... Anyway I believe this is the proper datasheet for the Tyco Electronics SRUDH-SS-109L and...
  17. TheChad

    Koford (Slot Car) Bench Power Supply Project

    What I was saying is that if I used the center tap on the transformer, the initial voltage will be quite a bit lower, thus the capacitor would bleed off faster, because instead of bleeding off 19v it would only bleed off 12v.. The problem now is that the resistor I have to drain off the...
  18. TheChad

    Koford (Slot Car) Bench Power Supply Project

    No, I was thinking, if I used the center tap instead, the voltage output would be much lower, Since I only need 12v. If I used the center tap that measures 7.2v before rectification, after rectification should be roughly 12v? which would be all I need anyway and possibly be able to not use a...
  19. TheChad

    Koford (Slot Car) Bench Power Supply Project

    Okay.. Resistors came in... It's works great, but having the resistor on all the time, it gets HOT! I tried connecting 2 to see if I could share the load, but them they both just got HOT! So then I thought I would check to see what voltage the center tap on the transformer was... It is...
  20. TheChad

    Koford (Slot Car) Bench Power Supply Project

    For the price, I can't imagine it being any cheaper to make the module my self! Just the components on the module would have cost me more than the whole module did! How can I tell if the output voltage is Fluctuating or if it's the motor causing the voltage/amperage to fluctuate? When I had...
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