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  1. Minder

    Help with sensing a stopped sprocket

    Seem to be making headway, have you come up with a period timing for the minimum rpm of the sprocket? Max.
  2. Minder

    Controling DC Fan Speed via Voltage

    http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm M.
  3. Minder

    Is this an inductor?

    Did you confirm first it is an inductor by a resistance check? M.
  4. Minder

    Help with sensing a stopped sprocket

    The only other things I can see is the sheet on the prox you are using suggests a 2.4k pull up when using 12v so R1 would be 2.4k, also I forgot the reverse EMF diode across the relay coil. M.
  5. Minder

    Controling DC Fan Speed via Voltage

    Buy one of the $5.00 PWM controllers on ebay. M.
  6. Minder

    Help with sensing a stopped sprocket

    It's late so I will go over it tomorrow, but off the bat I see a missing junction for the 1k pull up you have as R1 to the BLK prox output. M.
  7. Minder

    Help with sensing a stopped sprocket

    It would be a pity as the 18f start at 18 pin. I will give the 12F a shot first, if you are under the gun, so to speak, maybe CDRIVE has a quicker solution. Regardless I will press on and see what happens. M.
  8. Minder

    Help with sensing a stopped sprocket

    Good deal on the boards! I am just struggling to (re)-learn the 12f1822! I am so used to the 18F series now with out all the pesky banksel instr! Otherwise the 12F1822 is a nice chip with some handy features for its size. IF it works out it will replicate the 555 circuits as a missing pulse...
  9. Minder

    Help with sensing a stopped sprocket

    Correctamundo!;) M.
  10. Minder

    Help with sensing a stopped sprocket

    I am basing my idea of a input interrupt via the prox. which will reset the necessary timer IF each sprocket time is above the set minimum otherwise it will time out at the desired min rpm rate. IOW the time between each sprocket will be determined as a go/no-go. A no-go will automatically keep...
  11. Minder

    Help with sensing a stopped sprocket

    Working on it as time permits, I am trying to retire but some old customers won't seem to let me. I may have to disconnect the phone!:rolleyes:. Hopefully the rest of the week I can get back to it. M.
  12. Minder

    Rotary Switch

    There is also a thing know as 'Over Engineering' M.
  13. Minder

    Rotary Switch

    So I still really don't know why you need a quadrature/incremental encoder for this function, it is not standard practice for the application you seem to need, And a little over-complicated method. A 8 position wafer selector switch is the customary way, there are many manuf. of these, Grayhill...
  14. Minder

    Rotary Switch

    Are you operating this switch manually or is there another means used? How many menu's does it cycle through? M.
  15. Minder

    Rotary Switch

    Why do you need a quad encoder, it could be done either with a simple single wafer multi position switch, there is also coded versions such as BCD etc if needed . M.
  16. Minder

    Rotary Switch

    That is known as a quadrature encoder, the pulses are 90deg apart, it is used for speed and direction and is rated in pulses/rev, this number applies to either chA or chB, not both additively. That may not be the type you are looking for? M.
  17. Minder

    Help with sensing a stopped sprocket

    The spec sheet shows 5v to 24vdc. Use a 5v W.W.? M.
  18. Minder

    Help with sensing a stopped sprocket

    Cherry GS1005 Actually I see it operates at down to 5v so a 7805 should not be needed. M.
  19. Minder

    Motor Speed Controller

    Leeson is a very high quality motor, you could try running it on a automotive battery to see how it performs at low voltage, but if using a SCR bridge controller it may buzz a little at low rpm, PWM is the smoothest, but they need a power supply as you noted, a bridge rectifier and a capacitor...
  20. Minder

    Help specifying a replacement transformer

    Many of those small transformers have a thermal fuse buried in the winding, the problem is when they fail the transformer is unusable, in some cases the ends can be observed and soldered together, as it is only a safety precaution that saves overheating but renders the transformer useless!! It...
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