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  1. KrisBlueNZ

    Designing a Time Delayed Relay

    I think that's all you need to do before you send it off, apart from a clearance check on the PCB. The layout software should be able to do this. Can you generate netlists from the schematic and the PCB then compare them? That's a quick way to check that they match. A netlist is a file, usually...
  2. KrisBlueNZ

    Measuring 800hz ripple looks like noise

    What is this power supply a part of? What does the connected circuitry do?
  3. KrisBlueNZ

    Technics 1210 turntable internal fuse keeps blowing

    So you have a service manual and/or schematic? How about uploading them and posting a link so we all know what we're talking about?
  4. KrisBlueNZ

    Finally got me a 'scope - Have some questions

    Very nice indeed. I want one!
  5. KrisBlueNZ

    Designing a Time Delayed Relay

    Yeah, every update is visibly a lot better than the last one. It's often easiest to see potential optimisations when the display is as simple and uncluttered as possible. Try turning off everything except the through-hole layer and one copper layer. Then repeat for the other layer. In each case...
  6. KrisBlueNZ

    thermopile

    He started a second thread on an existing subject. I have now merged them.
  7. KrisBlueNZ

    CRT TV doesn't turn on

    This "ticking" could be "hiccuping". Hiccuping indicates that the power supply is starting up, then detecting a problem and shutting down. Then the soft start kicks in again and it starts up, and shuts down. And the cycle repeats. The cause can be any problem that triggers the power supply's...
  8. KrisBlueNZ

    does this seem right?

    No problem :-) Congratulations on your impending marriage!
  9. KrisBlueNZ

    Designing a Time Delayed Relay

    Hey, that's looking a lot better! The path between R14 and C14 is live, so you should move the top side fill away from it. I don't see any other obvious problems with it. In most cases, the order in which components are connected to a particular net is not important, and Eagle is allowed to...
  10. KrisBlueNZ

    Designing a Time Delayed Relay

    OK, on the schematic in post #144 (not 145, sorry), look at the bottom two diodes in the bridge rectifier. The two that are connected to CN1-1-2. The left one will conduct if CN1-1-2 tries to go more negative than the 0V rail. The right one conduct if CN1-1-2 tries to go more postive than the...
  11. KrisBlueNZ

    does this seem right?

    Here's my suggestion using the TC4469. No interface logic is needed. The TC4469 contains four buffer/inverters with high-current outputs designed to directly drive the gates of power MOSFETs. The MOSFETs provide one stage of inversion, so M1, the high-power motor, must be connected the...
  12. KrisBlueNZ

    Stereo output 3 or 4 wires

    Well, you have to check your results too. Just because you Googled headphone amplifier, doesn't mean that all your results will be suitable. The main ones you posted here don't even mention headphones in their description, and are not headphone amplifiers. So perhaps we should have said that...
  13. KrisBlueNZ

    Designing a Time Delayed Relay

    Referring to your schematic in post #145, when CN1-1-2 is positive relative to CN1-1-1, the PIC will see a high level at pin 2. So the PIC will see a signal with roughly 50% duty cycle, at mains frequency, on that pin.
  14. KrisBlueNZ

    Dynex DX-L42-10A Intermittent Issues

    Those resistor measurements look reasonable apart from R534 - Brown Red Black (12) 10k and increasing - I don't think the resistor would be 12Ω. Perhaps you misread the colour stripes, or maybe there are two circuit reference markings printed on the board and you used the wrong one. The...
  15. KrisBlueNZ

    Simple remote LED project - help

    Right, you connect the receiver's CR2032 to the "+" and "-" connections. The other three contacts are for the relay output. Normally, the relay on the board connects COM (common) to NC (normally closed), but when the output is activated, it connects COM to NO. So you need to make a circuit...
  16. KrisBlueNZ

    Simple remote LED project - help

    You can run them at various currents depending on how bright you want them. A single CR2032 is only 3V. What's the forward voltage of the LEDs? If it's more than about 2V (and it probably is), you won't be able to regulate the LED current. You would be best to use a separate CR2032 for the...
  17. KrisBlueNZ

    Yamaha RX-V459 receiver/amplifier does not power on

    Don't bother looking for that device online - it looks like it's programmed by the manufacturer. In any case it's unlikely to be faulty; it's probably shutting down because it has detected a problem somewhere else. Gryd3: Snap!
  18. KrisBlueNZ

    Nominal voltage or actual voltage for circuit calculations.

    This is important advice. The more voltage you drop across the current limiting resistor, the less the current will vary with variations in the supply voltage (and LED characteristics). The question of whether to use the nominal or the maximum voltage doesn't have a simple answer. You...
  19. KrisBlueNZ

    Simple remote LED project - help

    Hi there and welcome to Electronics Point :-) Yes, I think you're on the right track. What kind of battery are you planning on using? And what are the specifications of the LEDs? That particular receiver has a relay output, and while that relay is activated, it will draw extra current to...
  20. KrisBlueNZ

    Combining two circuits

    Hi Wayne and welcome to Electronics Point :-) This is a bit more complicated than you expect. First, the 555 is probably not the best monostable to use, because if the trigger signal remains active, the monostable will not time out Second, if you have a single fixed threshold on the light...
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