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Recent content by rjenkinsgb

  1. rjenkinsgb

    Does US electric code allow branching ?

    On basic principles, It would still need to either be rated to break the full supply fault current, or also have it's own HRC fuses feeding it for fault protection. Also, them maximum possible combined load must be within the "upstream" cable and equipment rating. There is no reason you could...
  2. rjenkinsgb

    Faulty heat air gun (dc motor) - problem to locate fault due to Intermittent fault [unrepairable]

    If it's two power levels, it likely has two electrically parallel elements, one in series with the motor and with the second switched in directly across the supply for 2KW. The old Bosch one I have has what looks like two sets of elements wound one inside the other. Could one of the elements be...
  3. rjenkinsgb

    Does US electric code allow branching ?

    I'm not in the USA, but I very much doubt that is permissible. The safe way to do it is add a 30A circuit from the existing distribution board, so the protection of that is handled by both the main breaker and the branch output breaker. Whatever you add to a mains system must be capable of...
  4. rjenkinsgb

    More fun with ws2812 this time XC8 and CLC

    Sounds like it does not comprehend the difference between SPI clock and data..
  5. rjenkinsgb

    The Analog Gods Hate Me

    The input amps have a gain of 2, rather than being unity gain. They also need bias resistors (10K or 100K) from the + inputs to ground and series coupling caps from the input sockets. With the connection as shown, they will pick up random offset voltages from whatever is connected. You do not...
  6. rjenkinsgb

    I Wanna build a robot

    Excellent idea, Jon! Many Roomba models have a 5V level serial port built in, so can directly communicate with a typical microcontroller for either monitoring OR commanding them to move etc. iRobot even publish the full info on the port and serial commands available. See this article for info...
  7. rjenkinsgb

    I Wanna build a robot

    Radio control type servos are very easy to control with any microcontroller, they just need a regular pulse with a set duration, with one and a half millisecond being the centre and longer or shorter moving each way. You can even control one with a 555 timer and a few components to make an...
  8. rjenkinsgb

    Impact of Tariffs on PCB Fab

    For info, those are non-printing movements speeds, not speed while extruding. That's limited to the heating capacity of the hot end with the filament and layer height etc., some rating in cubic millimetres per second. (Absolutely no idea how they compare on that; it's down to the hot end...
  9. rjenkinsgb

    Wierd makita battery

    A single tap on the battery is definitely a bad design, as there is nothing to keep the cells in balance. It will degrade and fail faster, possibly catastrophically!
  10. rjenkinsgb

    More fun with ws2812 this time XC8 and CLC

    The method I came up with was a function to (You just updated the thread). Similar to your new post, but no bulk bitshifting. For each input byte, start with a fixed template output value. (100100100100100etc). Test each bit in the input byte, if set then set the corresponding bit in the...
  11. rjenkinsgb

    UART Basic Before Writing Code

    The first character in UART stands for Universal - there is no "UART protocol". You can configure the device to support different speeds, different numbers of data bits, no parity / even parity / odd parity, different stop bits, and (with a fully capable UART) different hardware handshake...
  12. rjenkinsgb

    The Analog Gods Hate Me

    Not quite correct; the way you are using it, the gain is different from each source: From IC1a, the gain is -1 From IC1b, the gain is +2 It would need a 10K series input resistor between C5 and R14 to work correctly as a unity gain differential amp. The critical part of a differential amp is...
  13. rjenkinsgb

    Earbud wiring w/ mic

    Touch each pair combination in the right side cable with a multimeter set on Ohms - you will hear a definite "click" when you touch the earpiece wires. The other two will 99% be the mic. The button generally just shorts out the mic, so the same two wires - the device it's plugged in to detects...
  14. rjenkinsgb

    Impact of Tariffs on PCB Fab

    The Bambu Labs machines are really nice. I got an X1C with auto feeder in one of the sales last year; it's far faster than my other home built machines, and the surface finish is amazing! It's not actually making money, but it saves a lot of time - and time is irreplaceable, money is not.
  15. rjenkinsgb

    The Analog Gods Hate Me

    I think the OP is possibly confusing coupling with Decoupling? Just clarification.
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