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  1. (*steve*)

    Dial cord slipping

    Currently the pot is open circuit. It also appears to have switch contacts, but any switching isn't mentioned in the manual, and not does it appear in the current diagram.
  2. (*steve*)

    Dial cord slipping

    Here is the beasty...
  3. (*steve*)

    Dial cord slipping

    I sprayed some isopropyl on a block of rosin and used a cotton bud to transfer that to the slippery part of the dial cord. Yes, I had checked that things move freely, although some lubrication of these may not go astray. I may post some pictures of the device later... And that damn pot is...
  4. (*steve*)

    AC to AC relay for Landscape Lights

    If the lights are switching rapidly (and from your comment it sounds like they're not) then a solid state relay would be an ideal solution. Otherwise, I'd go with rectifying the low voltage AC and choosing a filter capacitor large enough to stop the relay chattering, but small enough to cause...
  5. (*steve*)

    What's this called (knob attachment)

    Sorry, what was the question? :-D
  6. (*steve*)

    What's this called (knob attachment)

    collet! (facepalm) Of course! Thanks
  7. (*steve*)

    What's this called (knob attachment)

    I have some smashed knobs with the following type of attachment. What's that method of attachment called? I want to try to search for some similar knobs...
  8. (*steve*)

    Dial cord slipping

    I have a piece of equipment that has a dial cord. The cord is wrapped twice around a 1/4 in diameter brass rod which is the shaft for the knob on the front panel. In one position the dial cord slips leading me to turn the knob more until the resistance is overcome and the main control starts...
  9. (*steve*)

    Forum Categories and Improvements

    I seem to remember that we used to be able to see deleted posts on people's profiles. That was very useful for moderation purposes.
  10. (*steve*)

    Power supply series connection

    Placing diodes across the power supplies is also a very good idea when placing them in series. If you short out the combined supplies, it prevents one power supply from driving the other with reverse polarity.
  11. (*steve*)

    Please help to buy those components

    I have just removed a number of posts that I think are nothing but unhelpful. The person who posted them would be wise to consider his posting habits. From his posting style you might have thought that this thread was about building a "free energy perpetual motion machine"
  12. (*steve*)

    Thevenin-Norton conversion

    Well, I presume you know that this equivalency allows you to interchange a current source having a parallel resistor with a voltage source having a series resistor. All you need to find are examples of one of these that could benefit from being converted to the other, and do the conversion. I...
  13. (*steve*)

    LCD monitor power problem

    Have you checked that the cable and the computer are working correctly? Try the monitor on a different computer with a different cable, and try a known good monitor using that cable and a known good cable. If you can, isolate the fault to a particular thing (computer, video cable, or monitor)
  14. (*steve*)

    2 digit LED counter

    I'd say it's probably a microcontroller. What happened immediately before it failed? (Did you connect the power backwards, or apply the wrong voltage?)
  15. (*steve*)

    LCD monitor power problem

    I'd start with the three brown ones. I assume they're rated as 25V to 35V. At the same time you could replace the four smaller black ones. The large green one should be OK.
  16. (*steve*)

    LCD monitor power problem

    I would still recommend replacing the electrolytics filtering the output of the low voltage rails. Caps can fail with no obvious symptoms, and I have repaired so many monitors this way (many with no obvious indications) that I just do it routinely.
  17. (*steve*)

    Electronics help

    To be most efficient antennas need to resonate at the desired frequency. In order to do that, the length needs to bear some relationship with the wavelength. We normally think that when a voltage is applied to a wire, the whole wire is at that voltage immediately, but when the length of the...
  18. (*steve*)

    Help identifying a component please.

    It looks like your spot meter went for a swim. If you saw a faint red flow, it could be that these are infra red LEDs. The 850nm LEDs have a small amount of emission that is visible (or is it that out eye has a small amount of sensitivity?) Either way, you can see a faint red glow. If you can...
  19. (*steve*)

    Voltage Amplifier

    That's exactly what the"bias" control on the front panel does :-)
  20. (*steve*)

    Voltage Amplifier

    There's several of these on eBay in the US at the moment. Two have buy-it-now for $25. It's got to be cheaper that rolling your own... Edit: apparently these were used for precision control of peizo devices, so maybe they're exactly what the OP wants.
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