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  1. Minder

    Ideas for 120 VAC fan motor failure detector.

    You should be able to increase the sensitivity by use a couple of repeated turns instead of single conductor. M.
  2. Minder

    Ideas for 120 VAC fan motor failure detector.

    An ideal device such as Honeywell CSDA current sensor works on a non invasive method, but I am not sure if they go that low. M.
  3. Minder

    Optocoupler symbol?

    Interesting. What kind of command is does it use for the servo drives? ±10vdc or step/dir? There must be a parameter page for set up for encoder resolution etc? Too bad the display is cluttered with Chinese symbols. M.
  4. Minder

    Optocoupler symbol?

    What is the nature of the controller? Mach3 or Chinese special, the latter is known for almost zero documentation. Most hobby machines use these sensors for home or over travel limits. BTW most of my job is CNC retro-fits for a living. M.
  5. Minder

    Help Identifying a Microswitch

    It should be relatively simple to shoe horn a miniature Microswitch model.just have to get a little inventive. I suspect you may have a problem finding the exact replacement. It is after all a simple foot switch. M.
  6. Minder

    Optocoupler symbol?

    The ULN2803 is a buffer driver, the opto is most likely a slot opto or retro-reflective type. Although the symbol is more representative of a slot type. There should be a 'flag' for a slot type or a reflector for the retro type somewhere on the M/C where they are triggered.. M.
  7. Minder

    TURNS PER VOLT of a transformer winding

    What is the form or type of the transformer, EI or Toroidal etc? Is this an existing transformer or are you constructing something, IOW do you already have the core, if so does it have any present windings? And if so, what are they? M.
  8. Minder

    Car diagnostic program

    Lookup CanBus sytems and OBD2 and the ELM327 IC https://developer.mbed.org/handbook/CAN M.
  9. Minder

    Automotive electrical diagnostics

    The system used in modern vehicles is called the CanBus sytem. Developed by Bosch. Many of the DC motors now are controlled by a PWM type drive. https://www.linkedin.com/pulse/automotive-can-bus-system-explained-kiril-mucevski M.
  10. Minder

    TURNS PER VOLT of a transformer winding

    If you want a balanced centre tapped secondary, it should be wound Bifilar. The easiest to add a winding on is an existing Toroidal type with the correct primary already wound, the typical T/V is around 2t/v this can be done by an empirical test of 1/2 dozen test winding's or so. The basic...
  11. Minder

    programming microcontrolers

    The instruction set for Microchip is only number around 30 instructions, and if programming in Assembly common module routines can be stored in a included (INC) file library to get away from re-writing them every time. M.
  12. Minder

    what is this part

    +1 on the pressed in rectifier, I have found them in alternators, typically. M.
  13. Minder

    Help with optical sensors

    You will notice that both LED emitter and the output are both rated at 50ma max. Size resistors accordingly dependant on operating voltage.. You can use the output in either 'collector' or 'emitter' for output, depending on whether you need sink or source type output. M.
  14. Minder

    What do I use for a 3 Amp Ammeter shunt

    You don't look for a 3 amp shunt, per se.. What is your meter, moving coil or moving iron? What is the FSD current? M.
  15. Minder

    Making a Powerful Solenoid

    I'm not really surprised, 34g wire and 50ma? When talking lb of force pull you will be looking at a number of amps required. At least 16g or more IMO. M.
  16. Minder

    convert 110v dc to 24v dc

    Place a 100uf capacitor across the 24v zener diode, V2. M..
  17. Minder

    convert 110v dc to 24v dc

    I have done this with a simple resistor, 24v zener diode and electrolytic capacitor. It was on a mobile crane generator that output 240vdc and I needed 12v or 24v for a regulator circuit. This worked a treat. You have to calculate the value of the series resistor for the max 24vdc load. For...
  18. Minder

    convert 110v dc to 24v dc

    What is the max current requirement of the 24vdc? M.
  19. Minder

    Can anyone help identify this socket? (resolved)

    You could make one in a pinch, although the Hirose are a devil to connect/solder without the correct tool! M.
  20. Minder

    convert 110v dc to 24v dc

    What is the nature and/or origin of the 110vdc? M.
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