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  1. KrisBlueNZ

    Creating Theater Magic

    Hi creamcorn and welcome to the Electronics Point forums :-) Here is a circuit that will do what you want. It has hysteresis (Google it) so it switches ON and OFF cleanly. The switching threshold is adjustable. It operates from a DC supply between 9V and 12V and can drive a lamp that...
  2. KrisBlueNZ

    Battery charger monitor

    We'll need to know about the connections to the board. There's a red and a black wire at the top, and at least three red wires at the bottom. Are there any other wires? What do those wires connect to? Measure the voltage between the red and black wires at the top.
  3. KrisBlueNZ

    audio bleeding between channels in the power amp stage of a mixer amp

    It is possible that there's a switch or a jumper to "narrow the stereo image"? It could be deliberately selected. I haven't heard of this, but it seems possible...
  4. KrisBlueNZ

    Need help with 555 timer circuit

    Yes, and yes. You will need to spread the leads a little bit. If you'd rather use a TO-220 package, there are plenty of options from Digikey. Here are three. http://www.digikey.com/product-detail/en/PSMN022-30PL,127/568-7512-5-ND/2606361 - the cheapest with low Rds(on) (0.022 ohms) in TO-220...
  5. KrisBlueNZ

    How can I become circuit designer

    Another very good source of information - one you mentioned in another thread Steve - is application notes. All the good manufacturers produce separate application notes for their products. Data sheets often have a large "application information" section, which is also extremely helpful...
  6. KrisBlueNZ

    Need help with 555 timer circuit

    There are thousands of options available on that web site. I could choose a few, but the chance that they'll be available at Ack Supply is not that high. Also, the Allied Electronics web site doesn't allow filtering based on package, which is a problem because most MOSFETs nowadays are in SMT...
  7. KrisBlueNZ

    Woo-Woo Power saving speculation

    LOVL Chris :-) Edit: Perhaps a "twilight zone" section WOULD be appropriate. It could be used for overunity crap and dietermoreno as well. Just kidding. (Sort of.)
  8. KrisBlueNZ

    How can I become circuit designer

    Steve, that was an excellent summary. Perhaps you should use it as the basis for a post or a thread in an educational section of the forums.
  9. KrisBlueNZ

    FOG MACHINE PCB FAULTY

    I get "The link you requested is not valid" for this one
  10. KrisBlueNZ

    FOG MACHINE PCB FAULTY

    Thanks for the explanation of how the unit operates. As best I can tell from those photos, the triac controls the pump and both the relays are involved in the circuit that supplies the heater. The outer relay clearly controls the heater, but the function of the inner one is not clear. It is...
  11. KrisBlueNZ

    Need help with 555 timer circuit

    Likewise. If the local inventory is not online, there's probably not much point anyway. If you're going there anyway, someone there should be able to recommend something suitable. N-channel MOSFET TO-220 package is probably best Vds(max) 20V or more Id(max) a few amps or more Rds(on) less...
  12. KrisBlueNZ

    need advice/help on dual laptop psu mod (load balancing)

    Sorry Bob, you're probably right. I'm actually having a trouble understanding ANY of the OP's explanations. I'll "but out" now.
  13. KrisBlueNZ

    Need help with 555 timer circuit

    I'm not surprised. As you said, it's not a common part. Ack don't seem to have a web site. You could still ask there. All you need is an N-channel enhancement mode MOSFET rated for at least 20V and a few amps, with an ON-resistance (the Rds(on) parameter) of less than 0.1 ohms or so. If they...
  14. KrisBlueNZ

    Need help with 555 timer circuit

    Yes it is. It's a MOSFET I've recommended for a lot of projects because it has an extremely low ON-resistance so it doesn't need a heatsink. It's also pretty cheap. If you were going to get one from a mail order supplier like Digikey or Mouser, it would be a good choice. I guess locally means...
  15. KrisBlueNZ

    Need guidance; newbie project - LED controllable steps

    I agree Bob. I suggested using a dot-graph IC because it would avoid the need for programming. If the OP wants to use a microcontroller, then he should. That would give the most flexibility and power. I don't think that avoiding the MCU makes it easier to extend; I think the opposite.
  16. KrisBlueNZ

    need advice/help on dual laptop psu mod (load balancing)

    Nothing is shutting down. I just suggested that he check the capabilities of the switching supplies inside the laptop, since he seems to be drawing a lot of power from them.
  17. KrisBlueNZ

    Rotary motor specs & step-changing voltage

    I can't help with your first question, except to suggest that you look for a similar product from a different manufacturer. As for the second one... The obvious answer is a microcontroller with a DAC (digital-to-analogue converter). Digital-to-analogue conversion can also be done using a...
  18. KrisBlueNZ

    What to do with 0.5 V and 25 mA?

    He answered that:
  19. KrisBlueNZ

    Need help with 555 timer circuit

    There isn't a simpler analogy. Have a read of it again. It shouldn't be hard to understand. The important points are that distance corresponds to voltage, tension corresponds to current, and stretchiness (of a spring) corresponds to resistance. Right, but the MOSFET breaks the circuit when...
  20. KrisBlueNZ

    Battery charger monitor

    Ah, that's probably because you've only posted nine messages so far. The forums are set up so that you don't get certain privileges for a while.
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