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  1. (*steve*)

    What kind of "switch" component detects current?

    Depending on various other (unknown) requirements, that component might be: A BJT (a "normal" transistor) A MOSFET An optocoupler A relay Your question (if interpreted literally) is so broad that many other things could also suffice. If the power supplies in the two devices have a common...
  2. (*steve*)

    need help repairing a power inverter

    Do you have any photos? The first place to take photos of would be both sides of the board where components are connected to heatsinks. Also an overall image to give us a feeling of where we are.
  3. (*steve*)

    Add a headphone jack to a radar detector?

    The obvious danger is having your head left connected to your bike if you come off. However I'm pretty sure something will disconnect or break before your head gets pulled off.
  4. (*steve*)

    LED Wiring

    The LEDs are all in parallel in each string. For the health of the LEDs retain the 20 ohm resistor for each string. This does mean you can't connect them end to end though.
  5. (*steve*)

    Charging 2x NiMH 9v batteries in series

    It is theoretically no more difficult to charge two batteries in series than just one. NiMH chargers were all the rage in electronics magazines a decade or so ago. Modifying one to work at a higher voltage should be possible. On the other hand it might be easier to just use 2 cheap chargers...
  6. (*steve*)

    Digital clock

    It is also possible that the clock has an option to select 50 or 60hz internally. It is also possible that even if this option exists it isn't obviously switchable or even documented.
  7. (*steve*)

    multimeter fuse help

    The correct fuses are very expensive. I had to replace one in a second hand 4 1/2 digit multimeter and it cost me almost as much as the meter! Cheap multimeters often don't contain the same rating of fuses and it's possible that less reputable manufacturers swap out the fuse for a cheaper one...
  8. (*steve*)

    Components Buyers Guide [for Dummies]

    Digikey has them, but freight might be a killer. It might be best to try to determine what is available and design around that. What are you actually trying to do?
  9. (*steve*)

    electronic diagrams oscilloscope HP 54501A

    I'm not exactly clear on what you want. Is the device broken and you want a service manual? Or Are you having problems operating it and you want an operators manual? A heap of manuals are available from the manufacturer. Here
  10. (*steve*)

    Finding an equivalent mosfet FQA36P15

    I wish it was that easy. Find out the specs that are important to you and search (say) digikey for mosfets which meet your minimum specification. Go through them (possibly in price order) to determine a suitable replacement.
  11. (*steve*)

    Building a Microphone should be easy, right?

    Or the level out of the mic is so low that it won't work with your PC's sound card.
  12. (*steve*)

    multimeter fuse help

    Go to http://australia.rs-online.com/ Type "fuse" in the search box and select "fuses - Cartridge fuses" In the Diameter section, select 6, 6.3, 6.35, and 6.4mm and "apply filters" In the voltage rating section, select everything >= 500V and "apply filters" In the current rating section, select...
  13. (*steve*)

    Bench Power Supply?

    Listen to Colin. He knows everything. For example, he knows that Hewlett-Packard never produced the HP6268B power supply. (Or if they did, nobody had a use for them). Hey, I think you probably need to consider whether these specs represent a need or a desire, but I'm not so arrogant as to...
  14. (*steve*)

    Wayne Kerr 7010 manual

    What! You have New Year too? Next you'll be telling me you have weekends. Thanks Ian.
  15. (*steve*)

    Transformer Help

    Well, if you assume the black and white are 120V, it makes the other windings 16.5V, 6.4, and 6.4
  16. (*steve*)

    Wayne Kerr 7010 manual

    Hey @Ian, any chance you could ask them if they have a service manual?
  17. (*steve*)

    Interpupillary Distance Adjustment on a Microscope Impossible?

    I have no problems with binoculars, but I do with binocular microscopes. I use neither regularly. It could be something about the way I hold my head. If you figure out what the solution is for you, let me know :-)
  18. (*steve*)

    A Current Balance Circuit for LED Strings in Parallel with Polyswitch Protection

    OK, you said they were on a heatsink but I didn't pick up that they were on the same heatsink. The closer the two strings are both thermally (i.e. the heat path between them is short) and electrically (i.e. variation of Vf with current and temperature) the closer the currents in the two...
  19. (*steve*)

    A Current Balance Circuit for LED Strings in Parallel with Polyswitch Protection

    No I'm not just talking about a single LED. I'm taking about chains. When I refer to something happening to one LED, the effect would be amplified if it happened to multiple LEDs. I agree that it should not happen with best practice because best practice suggests you don't put strings in...
  20. (*steve*)

    Pad has been ripped off from my protoboard, now shorted.

    Please find someone to help you with your soldering. Here are some quick tips: Don't fold leads over. If you need to stop components falling out when you turn the board over, just splay them slightly. Do one component at a time and trim the leads after you've soldered them. Use your...
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