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  1. KrisBlueNZ

    Logic set up times and hold times

    User willwatts has started five threads within the past few hours. I am closing all of them temporarily.
  2. KrisBlueNZ

    DVM meters with Square waveform mode

    User willwatts has started five threads within the past few hours. I am closing all of them temporarily.
  3. KrisBlueNZ

    Chop Mode and ADD Mode for Logic signals

    User willwatts has just started five threads within the last few hours. I am closing them all temporarily.
  4. KrisBlueNZ

    Stage Line 500W amp repair project

    You mean that R2 measures 673 ohms? That's within ±5 of 680Ω so that's OK. In the right channel, the matching componen is R52, not R25, right? Again 672Ω is fine. R31 (left) and R78 (right) are also 680Ω resistors, so measurements of 673Ω and 675Ω are fine. R30, R32, R62 (not R26) and R71 are...
  5. KrisBlueNZ

    How can I build a simple sound system for my laptop?

    I agree with Bob. Even normally reputable companies like Panasonic will use creative exaggeration when specifying speaker power ratings, because they too have to compete with BS specifications from less reputable companies. If you can have a look inside, you may find the truth marked on the...
  6. KrisBlueNZ

    decoder for 8051

    And did you get any of them working? Have you looked at the assembler output and matched the instructions to the instruction set documentation? Do you understand what the CPU core is doing at each step of the code? Have you tried changing the code to do new things? Have you tried all the...
  7. KrisBlueNZ

    Designing a Time Delayed Relay

    The PCB software should support several "mechanical" layers - layers for miscellaneous information that doesn't normally form part of the manufactured board but is useful during design. If it doesn't support mechanical layers, you might be able to use an otherwise unused layer - e.g. an internal...
  8. KrisBlueNZ

    Help with a simply relay circuit

    Not calculate, no. You can measure the resistance directly with a multimeter, or you can apply a voltage, measure the current that flows, and calculate the resistance using R = V / I. ALWAYS measure current in series. You need to break the circuit and connect the multimeter across the break...
  9. KrisBlueNZ

    Help with a simply relay circuit

    Yeah, that too :-)
  10. KrisBlueNZ

    Help with a simply relay circuit

    Hi there and welcome to Electronics Point :-) I'd guess it's a 12V coil. Relays generally pull in at around 2/3 of their rated voltage, and are often guaranteed to pull in at 75% or 80% of their rated voltage. A relay coil is both resistive and inductive, but the resistance determines the...
  11. KrisBlueNZ

    decoder for 8051

    You have listed the specifications for the 8051 but I don't think you understand it very well. You need hands-on experience with an actual 8051 device. Re-read post #29. I notice you didn't "like" it. Do you have a problem with learning by experimenting with a real device? I promise you, it is...
  12. KrisBlueNZ

    Adding aux input to Sony PMC-202 stereo system

    OK this is going to be messy to describe step-by-step but here goes. Yes you can do it all on the underside. Get a 1 µF capacitor and cut both its leads to about 8 mm long and tin the ends. Trace the track from IC309 pin 13 to R141. At the R141 end, melt the solder and add some new solder, and...
  13. KrisBlueNZ

    List of EDA packages

    Thanks John :-)
  14. KrisBlueNZ

    lm317 sub?

    OK, here you go. CD should be connected as directly as possible between pins 2 and 5 of U1. If you get oscillation at Q1's base, break the connection at the X and add the compensation capacitor CC and resistor RC as shown.
  15. KrisBlueNZ

    Dishwasher power switch

    No. The description says "solder type for the terminals connecting". So that switch is another version of the KDC-A04 (according to the description) or KDC-A11 (according to the title). Maybe the suffix (-2 for these ones) indicates the terminal type? I tried a Google image search on KDC-A04...
  16. KrisBlueNZ

    Dishwasher power switch

    Looks like they're called "quick connect terminals". Standard sizes (spade widths) are 4.7 mm and 6.3 mm. https://www.google.com/search?q=quick+connect+terminal&tbm=isch
  17. KrisBlueNZ

    decoder for 8051

    That's great that you're starting to understand how the instruction set works. But I think you should get a lot more familiar with what CPU cores do, before you try to design one. The amount of logic you need to build an ALU, an instruction decoder, etc is pretty large, even for a simple device...
  18. KrisBlueNZ

    Stage Line 500W amp repair project

    I'm not sure what those numbers mean in post #51. I think it's unlikely that any of the resistors are damaged but it's probably worth checking them before you install the semiconductors. See post #44 starting from the resistor colour code chart. There's full details in that post. You can check...
  19. KrisBlueNZ

    New to this. I need a component that uses a small signal to control a high power line.

    Hi and welcome to Electronics Point :-) I think you want a relay. https://en.wikipedia.org/wiki/Relay
  20. KrisBlueNZ

    Designing a Time Delayed Relay

    Whether you're past the point of diminishing returns depends on your priorities, I guess. I think what you have now is fine, if it will fit OK. Since you asked, I'll suggest how I might try to tighten it up, but I'm not saying that I think you should. That's your decision entirely. With that...
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