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  1. KJ6EAD

    Hobbyist Station

    There's someone on ebay right now selling used 937s for $60 out of Texas.
  2. KJ6EAD

    Hobbyist Station

    Plato tips are another high quality option.
  3. KJ6EAD

    Anyone can explain three types of LED tube?

    Type A is driven from the output of the existing ballast and consequently has significant compatibility issues as well as creating a dependency on a working ballast and the innefficiency of multiple conversions. Type B works from mains voltage wired into the existing sockets and has the...
  4. KJ6EAD

    Changing AC plug to battery operated

    No; didn't rule out a potato battery either. I make some reasonable assumptions to limit scope. ;)
  5. KJ6EAD

    Changing AC plug to battery operated

    There's been no indication from the OP that they intend to transmit to ground. It serves little or no purpose to do so.
  6. KJ6EAD

    Help to identify this component

    Assuming that you're trying to rebuild a battery pack, I'd expect to be able to find design guidance from the cell manufacturers as to what temperature would be correct.
  7. KJ6EAD

    Help to identify this component

    Well, I thought of that too but it doesn't quite have the look I'm used to for that. If it is a thermal fuse, it's there to prevent a fire by stopping charging or discharging activity when the temperature is catastrophically high, meaning the batteries are damaged and should not be used further.
  8. KJ6EAD

    Changing AC plug to battery operated

    You probably can power the camera with a small battery pack. Measure the voltage where the red and black wires from the power supply board enter the camera board. Expect 5V with the red wire being positive but since I can't assume there are no other conversion or regulation components on the...
  9. KJ6EAD

    Help to identify this component

    It's probably a thermal sensor (thermocouple or thermistor) that tells the charger when to terminate charge. The pack is of the older nickel-cadmium type I guess.
  10. KJ6EAD

    LED light: 120V and 25watts vs 12Volts and 25 watts: whats the difference?

    True pedantry would look something like this. 108V. Yes. They are intended to operate from hugely different sources. Yes. :D
  11. KJ6EAD

    Breadboard to Perfboard

    Prototyping PCBs exist that mimic the pattern of connections in a breadboard but you can bridge pads together on the board you have to create the positive and negative buses you need. Here's one. Sparkfun also has a larger one. https://www.sparkfun.com/products/12070
  12. KJ6EAD

    K40 Laser Cutter Upgrades

    Good. It seems you've got all issues covered even if the manufacturer didn't. I used a honeycomb base and only noticed unfortunately-sized circular cutouts of ABS catching in it occasionally.
  13. KJ6EAD

    K40 Laser Cutter Upgrades

    Casters instead of leveler feet is weird; probably just what they had handy that fit the holes that day. Is there no compressed air system to keep the lens clear?
  14. KJ6EAD

    help with cable extensions

    …but maybe something here. https://www.molex.com/molex/products/family?key=premoflex&channel=products&chanName=family&pageTitle=Introduction
  15. KJ6EAD

    Component identification

    It's probably a tantalum capacitor, possibly Panasonic or a knockoff of same. https://na.industrial.panasonic.com/products/capacitors/polymer-capacitors/poscap-tantalum-polymer
  16. KJ6EAD

    Cambridge Soundworks CD 740 radio

    No. There's a problem with the timebase or it's dividers that would not be time or cost effective to explore. An exact replacement can be had for less than $100 and comparable units can be purchased new for less; name brands such as Panasonic or Sony, a bit more.
  17. KJ6EAD

    Identifying a chip

    If I were very motivated to repair this, I'd be tempted to try installing a 68000 series mcu in a socket and see what happens. https://en.m.wikipedia.org/wiki/Motorola_68000#CMOS_versions
  18. KJ6EAD

    Exposed Adapter, Uncertain.

    Those barrel plugs and jacks typically come in two lengths, ~9mm and ~11mm. An 11mm plug in a 9mm jack is only a problem if it gets levered causing physical damage to the jack. You can replace the plug with a shorter one if you like.
  19. KJ6EAD

    Name of this connector please?

    Take a lighted magnifier to the wire entry end of the housing to see if there are any markings.
  20. KJ6EAD

    Hobbyist Station

    That's a clone of the famous Hakko 936.
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