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  1. C

    pulse generators

    The collar circuit is the whole secret of the design. That's why no-one has realized how it works.
  2. C

    Wanted: As many small push button switches as possible!

    Smaller ones are 3 to 5 cents each. I buy them by the 1,000's
  3. C

    6 Volt Motorcycle Alternator. Possible voltage regulator?

    The regulator would need to be 8v at 20 amp
  4. C

    RC circuit

    The first thing you have to do is draw the circuit as GATES. Not "block diagrams."
  5. C

    pulse generators

    You need my "ferret finder" circuit. I has a depth gauge.
  6. C

    Electrically controlled expandable rod

    You can also use a servo with a crank and push-rod
  7. C

    Electrically controlled expandable rod

    It's called a SCREW JACK
  8. C

    looking for a transformer

    12VA Transformer weighs 500gm
  9. C

    Help with switching

    Not enough details. What is the value of the voltage that you are using to turn on the 14v circuit?
  10. C

    A bit of physics

    "In summary, when the power is constant the acceleration is not constant." That is entirely untrue. Look at F = ma.
  11. C

    A bit of physics

    This is a simple year 11 Physics problem F= ma 50kW = 36,878 ft-lb/sec 36,878 = 2240 x a a = 16ft/sec/sec v = u + at 60MPH = 88ft/sec 88 = 0 + 16t t = 5.5 sec
  12. C

    A bit of physics

    "Avoiding having to calculate acceleration is the key to a simple answer." This is NOT TRUE.
  13. C

    A bit of physics

    "the force will vary with velocity," This is NOT TRUE.
  14. C

    A bit of physics

    F=ma
  15. C

    a few half-burned resistors in circuit. how bad is it?

    You cannot damage a 47k resistor and it never goes to 23k.
  16. C

    Koford (Slot Car) Bench Power Supply Project

    I forgot to mention that the 8 amps is AC amps. This has to be recalculated to 5.7 amps DC and if you are drawing 8 amps DC, you are overloading the transformer.
  17. C

    Koford (Slot Car) Bench Power Supply Project

    Don't forget, the 12.6v is AC voltage, and the transformer is designed to drop to 12.6v AC on FULL LOAD. This means the unloaded voltage is about 2v higher . Taking 14.6v AC and converting this to DC comes to 20.5v. DC Each bridge drops about 2v on full load. You need 4v across the...
  18. C

    Koford (Slot Car) Bench Power Supply Project

    Daisy chain the bridges. Feel each regulator with your finger after a minute of high current and if one is hotter than the rest, they are not sharing. It's pointless doing anything unless you KNOW the problem.
  19. C

    Koford (Slot Car) Bench Power Supply Project

    The only way to spread the heat is to add a 10 amp bridge between the transformer and the first bridge. I have hundreds of these as scrap and its a cheap way to solve the problem. You can add two or more until you get the maximum voltage-drop allowable for the output voltage you are requiring.
  20. C

    Questions on power supply

    Using a power supply with CC is just like using a set of old cells, so why are you canning the idea??? Nothing that you say makes any sense. Where is a beginner going to buy a cheap power supply for a $5.00 project? Who is going to teach him how to use CC setting? The "old wall-wart" blew up...
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