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  1. colum

    Analog frequency meter

    Thanks for the excellent articles on meters. As suggested before the non electrical physical contact meters could register vibrations in bad bearrings etc I am going to see if it works on AC and DC motors and if so then its the rotating armature and if its only the AC then I assume its the...
  2. colum

    Analog frequency meter

    Hi bertus. One more question. When I send these photos do I forward them to your original response or to the last photo (mine) uploaded. I just want to make sure you see them, I'll need some advice. One of the contact meters have a Hz scale in the 20s is this an old RR scale..Thanks...colum
  3. colum

    ic 4027 wave form

    Thanks Bertus for your well thought information. The only info I have for the transformer is 40v unreg to A of the CT output transformer but I will check to see if I can find the magazine for more info. I am going to try to use the 1and 2 as outputs if I don't wreck the whole thing before...
  4. colum

    Analog frequency meter

  5. colum

    Analog frequency meter

  6. colum

    Analog frequency meter

    Got it, you may get one or two at a time so that you can see finer details. Some are very old
  7. colum

    ic 4027 wave form

  8. colum

    Analog frequency meter

    Hi hevans1944. If you are still interested I have started my old Sony H1 camera and will send some photos of the Tuned coil meters but I'm not sure about file size on these forums or if there is a way to send the photos directly there are about 12. ..colum
  9. colum

    ic 4027 wave form

    Thanks for all of the replies I built this circuit from an old Astronomy magazine which was a mistake and never verified I give up on this and try to find verified circuits for my bucket list. Many thanks to all the great folks in these forums....colum
  10. colum

    ic 4027 wave form

    Thanks bertus that answera alot. Wonder what happens to the jumper from 13 to 1 in my circuit
  11. colum

    ic 4027 wave form

    The circuit is a divide by 2. With the current wiring the output pulse is all over the place fast slow large small The input signal is from a 555 and is stable . could someone suggest a repair or different wiring Thanks...colum
  12. colum

    Analog frequency meter

    Thanks Hevans 1044 for your interesting history. I live in sight of the old RR bridge in Poughkeepsie NY and was in use up to the 1970s but caught fire and was abandoned until 2005 or so then it has became a very long walkway over the Hudson river from Pok to Highland. I don't know much about...
  13. colum

    Solar cell soldering

    Thanks 73's de Edd for your advice, I can't wait to try it again.... colum
  14. colum

    Analog frequency meter

    Hi bertus. Sorry my camera is busted..I have round faces that are either 60 cy + - and 400 cy + - and a load of vibration meters that are placed on motors that record the rotations of many speeds and one that is hand held that shows 1750 rpm + - all with no electric contact..I've spent too much...
  15. colum

    Solar cell soldering

    I've been soldering for many years but my first attempt at connecting wired to a solar cell has been pretty bad. I used 60-40 fluxed thin my best connection was by fluxing the silver line first and then heating a drop of solder on it and then applying the heated silvered wire to the drop. I...
  16. colum

    Analog frequency meter

    Thanks Nanren888. I see what you mean about the input conditioning. As a hobby during the pandemic I 'm fixing old old power supplies and the input for the " tuned coil " vibration meters need amplification adjustments to read correctly but are Ok with sine waves.. the needle meters are much...
  17. colum

    Analog frequency meter

    This meter is very old certainly before transistor and it does read the Hz with the reading roughly in the centered of the vibrating needle. I was just wondering what type of circuit would calm it down. Could this kind of meter not work on sine waves or an amplitude issue. Thanks for your...
  18. colum

    Analog frequency meter

    I want to hook up an old analog needle type Hz meter but the needle swings wildly even with a stable Hz source...any ideas why and how to fix..Thanks....colum
  19. colum

    400 Hertz at 120 V

    Thanks shrtrnd. These meters were bought at a flea Mkt and are built so well and most likely USAF like you said I am trying to get them working as a hobby item and also to prove I can do it I have some good quality sealed Synchro motors that are 60 cy but were meant for underwater (was told) so...
  20. colum

    400 Hertz at 120 V

    These meters seem to not care if the sine is a pulse or square or triangle as tested on a 60cy meter the only that seems important is stability of the cy Jeff
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