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  1. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    I'm not sure what you mean, but yes, a triac operates as a switch, like a relay, with a lower trigger current. I think in this application a triac might be a better option than a relay, but I'm not sure. OK. I think the idea is workable. The bridge rectifier connects between the AC supply...
  2. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    Yes you can use a relay instead of a triac as long as you have enough supply current available. Relays (especially high current ones) need quite a bit of coil current. With a 2200W load, I don't think that will be a problem! Can you confirm that you want to use a switching power supply, powered...
  3. KrisBlueNZ

    Microscope capacitor exploded

    Bruce, what's your location? (You can put this in your profile; it can be helpful for us to know). And what's your mains voltage?
  4. KrisBlueNZ

    Guitar amp foot switch question

    My guess (and it's just a guess) would be that the socket on the amp is designed for a dual foot switch - one switch for clean/dirty and the other for reverb on/off - and is supposed to be used with a tip-ring-sleeve plug. When you plug a mono plug into it, this shorts the ring contact to the...
  5. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    So you connect a switchmode power supply across the switch, so when the switch is OFF, the power supply powers the circuit, then when the switch is ON, or the circuit is driving the triac which is in parallel with the switch, the circuit is powered by the load current using the series powering...
  6. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    My method cannot be used to switch the load ON. The circuit only receives power while current is flowing in the load. Something must start that current flowing, and it cannot be the circuit, because while the pump is not running, the circuit has no power, so it cannot switch itself on.
  7. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    So you have a wall switch that controls a 2200 watt water pump, and you want to be able to switch it ON remotely using a wireless remote control? And you've made the wireless receiver? Can you post a schematic of it? What power source does it need? I don't understand. No, the...
  8. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    What? Are you asking whether it works? I haven't built it up so I can't say for sure, but I'm certainly expecting it to work! That depends on how you want to control the triac. For my project, I decided that you would be able to select from several different fan turn-off delays by switching the...
  9. KrisBlueNZ

    power with line wire enter the wall switch and out going and there is no neutral

    I'm working on a project that does exactly this. It's a turn-off delay for a bathroom fan. The wall wiring for the fan doesn't have a Neutral wire so I have to get power for the micro by intercepting the load current. I use a triac in parallel with the switch so that the circuit can keep the fan...
  10. KrisBlueNZ

    high frequency audio amplifiers

    Elliott Sound Products http://sound.westhost.com/ is an excellent site full of well-written articles on subjects related to audio and electronics. I try to avoid it because I will spend hours reading and learning. He has a few articles on crossovers, and many on amplifiers, but there's also...
  11. KrisBlueNZ

    Car audio problems: MP3 player into CD changer socket

    Ok, thanks for the explanation. I don't know what the conventions are for powering cigarette lighters. It may have changed over the years. Back in the day, cigarette lighters were used for... lighting cigarettes, and it made sense to have them powered when the car was not running. But in the...
  12. KrisBlueNZ

    BOSS DS-1 Pedal

    I checked out the YouTube clip and you're right, there's no sign of that "popping" sound. But they didn't show the full range of adjustment on the controls, so that MAY not be a fair comparison. It could be useful to trace the signal through the circuit from left to right and see where this...
  13. KrisBlueNZ

    Microscope capacitor exploded

    Hi Bruce and welcome to Electronics Point. I'm not sure that the value is 0.1 µF. The marking that might be a decimal point looks more like a comma, and I don't think it's made in Europe where commas are used as decimal points - Marcon seems to be a brand of UCC, which is Japanese, although the...
  14. KrisBlueNZ

    SOT23 PNP is dissipating too much?

    Please excuse me Steve while I post on this closed thread. A few comments on the design. These are in addition to Steve's comments in post #12 which you should also read carefully. The CPH3105 is specifically rated for a maximum base current of 600 mA, and this suggests to me that it's...
  15. KrisBlueNZ

    Latching Relay Logic Help

    I think so. You would have to draw a complete circuit diagram to be sure, but I think you understand what you're doing.
  16. KrisBlueNZ

    SOT23 PNP is dissipating too much?

    What is the "load"?
  17. KrisBlueNZ

    Car audio problems: MP3 player into CD changer socket

    So this adapter plugs into the CD Changer connector on the back of your head unit? This connector is designed for use with a CD changer in the boot/trunk of the car? And the head has a single CD player built in, which works properly? I don't think the cigarette lighter has any bearing on the...
  18. KrisBlueNZ

    6V~24VDC mini breaker

    Hi and welcome to Electronics Point. Not enough information! What's the manufacturer and part number of the original breaker? What's the voltage of the circuit where the breaker is used? What's the manufacturer and part number of the 12VDC breaker you're considering using?
  19. KrisBlueNZ

    L.E.D battery capacity & charging indicator

    As BobK says, you need to tie your battery energy indicator to the battery chemistry, and monitor the current flowing in to (during charging) and out of (during use) the battery. You may also need to monitor battery temperature, because this affects leakage and other characteristics (and is a...
  20. KrisBlueNZ

    do i understand AC and DC current in a vehicle?

    Yes, as you say, because stranded wire isn't all wire; there are gaps. Right. With Litz wire, each strand is individually insulated, so there is more surface area, so skin effect is less of a problem. That's why Litz wire is used in (some) inductors in RF applications. Cheaper, yes. Inside the...
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