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  1. J

    D Cell Rechargeable pack?

    These folks make cell-replacements with built-in charging. Not cheap, though.
  2. J

    Newb needing guidance on 3-phase service.

    You cannot. The transformer would need to be changed. Also: I'm not convinced you need to. What are you trying to power?
  3. J

    Newb needing guidance on 3-phase service.

    It's a 3phase 240v delta service, with the center of one phase taken as neutral for 120 volt loads. The 208 v measured to neutral is(was) called the "stinger leg."
  4. J

    Boosting the Amper and altering the frequency

    There has been another discussion here about this very subject The drive seems to be 1KHz AC, making the DC boost circuit unhelpful.
  5. J

    Relay With Circuit Board Feedback

    Can you use a relay with two sets of contacts, i.e., a DPST or DPDT?
  6. J

    LCD Help Please

    Have you seen this page?
  7. J

    VDO Voltmeter

    Automobile voltmeters draw more current than multimeters. Measure the current into your meter when it is connected across a reasonably stiff 12-volt source. That is the current for full-scale deflection, and what you must come up with by reducing the value of that 68-something resistor and...
  8. J

    LED Edison-style patio lights

    Need part-numbers etc.
  9. J

    PAL 16R6APC .....

    There were/are the applications ABEL and PALASM for PAL development. They show up as freeware now and then. I remember feeling like the king of nerds when several pages of logic equations and wishful-thinking were burned into a breadboard of those things.
  10. J

    Advice about MC34063 based buck converter diagram

    Have you seen this? It's been kicking round for a while and I've used it often.
  11. J

    buttons for bluetooth receiver

    Are you sure it's not an encoder? "spin free" is not something potentiometers usually do.
  12. J

    Button with analogue output?

    You could try these not-cheap sensors
  13. J

    Is it possible to use barometer module using UARTS?

    That barometer seems to use an SPI connection. IF your flight recorder can accept SPI inputs and IF you have access to the recorder's code, you can do it. Connection by UART seems unlikely, but I don't know your level of expertise.
  14. J

    LM2596

    This is instructive
  15. J

    PCB fab small run - single sided - nothing fancy - down and dirty...

    https://jlcpcb.com/ They got me ten boards in five days for ten bucks
  16. J

    What reason could be for a food processor's motor to run backwards?

    We have a juicer that reverses direction every other time the fruit is pressed down on the top
  17. J

    Vintage ADMIRAL 19A1 Chassis

    "You" can hear it.... not I
  18. J

    Vintage ADMIRAL 19A1 Chassis

    The horizontal frequency isn't 15.7 KHz?
  19. J

    Hep needed to ID vintage tube

    https://vinylsavor.blogspot.com/2016/07/tube-of-month-80.html Definitely
  20. J

    USB C charger with audio output design

    Here is a starting point
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