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  1. colum

    Bleeder resister size

    I want to put a resister accross a DC supply leads to discharge the voltage in the capacitors. This will be only used to discharge after each useage. I expect the voltage to be from 1 to 125v DC and the amperage to max of 3 amps. I checked all of my books and the internet and I could not find...
  2. colum

    DC Motor drive

    Im new at this so I hope I don't make the attachments too large or small. I built this circuit and it seems to work for a small DC motor but I need to drive a motor that takes 1 to 6 amps at 27v DC problems--DC volts shoots up to 40v from27v when Mtr turned on Pontentiometer---Overheats...
  3. colum

    Missing Thread

    I started a new thread yesterday and I can't find it. I'm new at this so how long does it take to hit up...Thanks...colum
  4. colum

    Looking for vintage parts and selling some

    I wonder if there is a forum that you can exchange or buy used parts to repair or rebuild very old electromechanical and old test equipment. This is a hobby of mine and I have lots of unfinished projects but parts (such as Variacs etc etc) are hard to find. I have panel meters and motors for...
  5. colum

    Adding Transformers

    A single transformer is overheating so can I add another transformer with the same volt output so that would make it two with their out put joined.. The purpose is to drive a 6 amp motor at 27 volt DC from 115 volt AC or would it be better to join the DC after the rectification and then smooth...
  6. colum

    27vDC 6a from 115vAC

    I need a variable power supply that will supply 27v DC at 6a from 115v AC to drive a small motor generator.. would this circuit need to be regulated in order to have a stable frequency at the AC generated...Thanks for your help and please keep in mind it needs to be variable ...Thanks...colum
  7. colum

    Fiber Optic

    I rescued 2 large rolls of fiber optic cable, one roll had the ends still attached and one rolls optic ends were cut off, I wonder if anyone knows a way I could attach an end or use this cable in some other way, the glass wire is quite thick and when I remove the many coatings including the...
  8. colum

    Generate 2ph 60cy 115/115v

    I worked with 3 phase 220v and each leg to ground was 115v yet the total was 220v. I was told this depended how it was generated. I don't have access to 3ph any more and I want to run a small motor generator that calls for 2ph 115/115, 60cy in the motor and the output is 115v AC at 400cy So...
  9. colum

    Capacitors DC in AC cts?

    I have a small synchronous 120 v AC motor that is going to power a tracking device. It calls for a capacitor so can I use a DC capacitor which I have plenty of and anyway what is the difference in construction not including the polarized DC caps I know they wouldn't work on AC.. Thank you for...
  10. colum

    Frequency meter

    I would appreciate it if someone would advise or give me a circuit to measure frequency using the 4000 series ICs and either 3 or 6 digits 7 segment displays I have free small motors (postage only) in the for sale section Thank you..colum:
  11. colum

    Free small motors

    Hi everyone, at one time I was an avid builder of robots and machines that would track stars and planets for telescopes and cameras however the technology has changed and I now have a collection of Synchronous motors and DC and AC and steppers that I no longer need so if anyone wants a motor let...
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