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Recent content by jpanhalt

  1. jpanhalt

    Which switch

    bicyclophobia? Google AI When comparing injury incidence, stationary bicycles generally pose a low risk of injury, especially when compared to higher-impact exercises like running. Grok4 Comparing injury incidence from stationary bicycles to other low-impact exercises like swimming, walking...
  2. jpanhalt

    Which switch

    That's a standard SPDT (single pole double throw). Full size (not miniature) and very common.
  3. jpanhalt

    Have a ultrasonic washer but not knowing what detergent for cleaning soot

    ZipZapOuch Do you know what "flash point" means? The flash point of 2-butoxyethanol is 67°C (153°F) neat. Most people will not be heating their ultrasonic to anywhere near that temperature when cleaning PCBs. I need only 1 minute to clean most boards and 1.5 to 2 minutes for really stubborn...
  4. jpanhalt

    Have a ultrasonic washer but not knowing what detergent for cleaning soot

    BS. I don't care about EP rating. And besides Dettox does not even have an MSDS I can find. Google converts it to Dettol, which contains: As for effects on plastics the behavior of pure butyl cellosolve are irrelevant to dilutions in water with 10% or less. Neat, it will remove cured enamel...
  5. jpanhalt

    Have a ultrasonic washer but not knowing what detergent for cleaning soot

    I agree in part with "floor cleaner." You have to read the label. Some will be based on ionic detergents, which might leave residues or bound ionic compounds. I switched to ZEP heavy duty floor stripper for removing flux from whole boards several years ago. It will dissolve acrylic floor...
  6. jpanhalt

    PWM replacement for car lighting dimmer

    @PlaneCrazy General aviation airplanes of that era just used a power NPN on a heat sink with a standard (not high current) pot on the base. I have no problem with the plan to use PWM, but the other design is a little simpler. As for PWM, why do you need to change to LEDs? That adds complexity.
  7. jpanhalt

    Does US electric code allow branching ?

    Re: Post 7 and later Running two panels from the meter is called a "split-bus" system (Wiring Simplified, 42nd ed., 2008). They could be used in the past, but according to Google are no longer NEC code: (Comment: That last sentence is confusing. Earlier split-bus systems were also limited in...
  8. jpanhalt

    Vero board cutting

    I use a miniature (e.g., 4") table saw with carbide tipped blade. That also works well to isolate tracks with copper plated PCB. A guillotine type vinyl tile cutter also works well: I then finish on a hobbyist belt (1") or disk sander.
  9. jpanhalt

    My Advanced Realistic Humanoid Robots Project

    I use PTFE tube as guide tube for thin pushrods in my sailplanes. The largest was 1/4rh scale. I have never (about 30 years) had the bonding (usually epoxy or Eclectic E6000) to the fuselage or wings loosen as you describe. 1) Harden the PTFE by stretching it to a limit. As you stretch it...
  10. jpanhalt

    Problem in processing data recieved through UART and display on GLCD

    Try single quote for single characters. At least in MPLab (not MPLabX) that is how it works. From the MPLab User's Manual: And The latter example shows packing, e.g., the lower 7 bits of 0x31 and 0x32 are b'0110001' and b'0110010. Packed = 01|1000|1011|0010 = 0x18B2. John
  11. jpanhalt

    Problem in processing data recieved through UART and display on GLCD

    I don't disagree with the distinctions being made. Here's something to consider: My current project is done mostly in BCD, and I don't use packing as RAM is not limiting. Thus, I send, read, and calculate in BCD*, e.g., dec. 9 (BCD) = 0x39 = dec. 57 ASCII. It's easy to convert back and forth...
  12. jpanhalt

    SMT Prototyping Methods

    Here's a soldered simple example from last Winter. The central pads were not used as the one I needed was not nearby. That is why I am considering making all the center footprints 6-pin. You can see where leaded resistors were used to jump columns without using jumpers.
  13. jpanhalt

    SMT Prototyping Methods

    It's unclear on that board how the pads are interconnected, if at all. I like interconnections like in the typical solderless breadboards. I was frustrated with the usual breakout boards (BOB) as they are expensive and take up a lot of space on a solderable breadboard. (I have used solderable...
  14. jpanhalt

    Does US electric code allow branching ?

    I suspect it is allowed and quite common in areas with separate garages and/or other outbuildings. Last time I looked at the condensed code books (e.g, Home Depot and Lowes) there were instructions for doing that. A separate ground may be required, if it's a building with outlets. 30A is...
  15. jpanhalt

    I Wanna build a robot

    Another place to look for help and ideas is the Dallas Personal Robotics Group (DPRG). It's been around a long time and is still active. Here's its home page: https://www.dprg.org/ And here's a link to archived projects, some of which date back to the 1990's -- well before you were on Earth...
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