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Recent content by betwixt

  1. betwixt

    How best to synchronise the UCC38C45?

    Regarding your first post, it really depends on what you are synchronizing to. 60KHz is well within the capability of many MCUs but the accuracy and increments/decrements of frequency may be a problem. For example if you want 60KHz but the micro could only produce 58, 59 , 60 , 61, 62KHz would...
  2. betwixt

    unknown component z1

    My guess is MOV to protect against nasty voltages on the probes. Why 'z' is used is a mystery. Brian.
  3. betwixt

    The Analog Gods Hate Me

    I think a re-think is called for! I'm guessing the requirement is (calling the inputs A & B) 1. sum. The average of A and B, (A+B)/2 2. difference. What is in one channel but not the other (A-B). 3. common. Everything that isn't common to A or B. (sum - difference) I would start by using a...
  4. betwixt

    The Analog Gods Hate Me

    On the face of it, nothing is wrong although some is unconventional. When you say there is reduced or no output, is this at the loudspeaker or the line out connectors. It's just a guess - the TDA2050 module input might have internal feedback creating a virtual ground that 'shorts' the sound...
  5. betwixt

    How to make string LEDs?

    That's what SHOULD be there but in most LED strings the AC is applied directly to the LEDs and they are wired 'anti-parallel' in short chains. Being wired across each other but reversed means half of them conduct on one half cycle and the remainder on the other half cycle. Wiring them in short...
  6. betwixt

    How to make string LEDs?

    In series, add enough LEDs at 3V each to make up a little more than 220V. A few more ensures they do not run at maximum current and all burn out simultaneously! For AC, the LEDS are wired the other way around in short chains, for example 10 LEDS in series one way then in parallel with 10 LEDs...
  7. betwixt

    Converting 16 individual bool variables to 16 bit value

    Many ways to do this. Another, if you have named bits is to set them with:FlagVector |= (1 << FLAG_x);, reset with FlagVector &= ~(1 << FLAG_x);. Brian
  8. betwixt

    Converting 16 individual bool variables to 16 bit value

    Shift the bits right then '& 1' or create a mask variable with value 1 and shift it 16 times, '&'ing with the variable and seeing if the result is zero or not. Brian.
  9. betwixt

    Non-Blocking Push-Button LED Control (8051)

    I think its an Alps SKHHA series switch but they come in various sizes. Do a search on vendors websites and you should find links to download the data sheet. You only have to read the switch twice, first when the press is detected and again after a few mS. If the state hasn't changed you should...
  10. betwixt

    Converting 16 individual bool variables to 16 bit value

    Another method is to use a union. Make a struct of the 16 bools under one name and read that name as a value. Brian.
  11. betwixt

    Circuit topology

    You might be able to do it with two diodes in series and some resistance across them. The 0.6V steps are about what to expect from Vf of a silicon diode. Brian.
  12. betwixt

    Non-Blocking Push-Button LED Control (8051)

    What language is the code to be written in? I can't help you with the program but if all you want to do is emulate the action of the switch (as though it was just in series with the LED) there is no need to use blocking code at all. Just read the logic state from the switch and write it to the...
  13. betwixt

    How to connect a logic level shifter/voltage regulator to the Seeed XIAO RP2040

    You are taking on a fairly advanced project for a beginner... Basically, you can drop SUPPLY voltages using a regulator. The supply can come from a USB source or an external power supply. Obviously, drop it to the supply voltage needed by that part of the circuit. If you use USB as the power...
  14. betwixt

    UART Basic Before Writing Code

    Your 'frame format' is correct. A stream of 1s and 0s alone cannot tell you anything if you can't find where one part of the data ends and the next begins, that is what the start and stop bits do. I'm confused why you don't understand full duplex operation. The UART has an input pin and an...
  15. betwixt

    UART Basic Before Writing Code

    UART = Universal Asynchronous Receiver Transmitter, it is hardware, shift registers fabricated in silicon. There are software emulations of a UART where some software code makes the pins of an MCU rise and fall in the same pattern as a real UART would and possibly monitor some pins at fixed...
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