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  1. KrisBlueNZ

    Using $1 stereo amp in mono mode

    Resistors mix the left and right channels together. You need to do this - for music, at least - because instruments are placed at different positions on the soundstage and listening to only one channel may mean you don't hear some instruments, and others are louder than they should be. You...
  2. KrisBlueNZ

    Audio Amplifier distortion issue

    Ah, sorry. I missed that. Yes good advice.
  3. KrisBlueNZ

    Audio Amplifier distortion issue

    Which pot?
  4. KrisBlueNZ

    Microcontroller controlled by pushbutton for LED flashlight

    Handling - electrostatic discharge during installation, and changing the batteries if they're not rechargeable. Possibly. Maybe I'm being over-cautious. The junction capacitance of the diode will absorb a lot of energy but it's still possible for the diode to be damaged. Perhaps you should have...
  5. KrisBlueNZ

    Using $1 stereo amp in mono mode

    Yes it will be the drivers. My mother's laptop, an Asus, has a 2.5 mm socket on the side for connection to an external speaker (just a driver, mounted facing downwards in a cylindrical plastic enclosure), called "SonicMaster". The amp is inside the laptop. And the external speaker is very loud...
  6. KrisBlueNZ

    Newbie Question

    Yeah, Circuit Help or Electronics Projects. There's a lot of overlap between those forums. If it drifts towards one or the other, we can always move it later.
  7. KrisBlueNZ

    basic question about signals

    Who said it? And can you link to where it appears? Also, please provide links to the material you have been learning about this from.
  8. KrisBlueNZ

    Microcontroller controlled by pushbutton for LED flashlight

    Hi again Jeff. I found a few more Schottky diodes with better specs than the ones I listed on the schematic. They have lower forward voltages, which will ensure maximum voltage on the reservoir, which means maximum gate bias for the MOSFET(s) and lowest ON-resistance. They're also a bit cheaper...
  9. KrisBlueNZ

    Schottky rectifier

    Yes, very nice! I'll hang onto that data sheet. In fact I have an application in mind for it already. It's a bit of a shame that it's only rated for 10V reverse voltage, but you can't have everything you want.
  10. KrisBlueNZ

    Newbie Question

    Hi Nala and welcome to Electronics Point :-) We often get requests for help with projects, including modifications and design, and if we have experience in the relevant fields, we are happy to help. I have drawn up over 170 schematics - many simple, some quite complicated - since I joined in...
  11. KrisBlueNZ

    basic question about signals

    OK, and what is the difference between an "energy signal" and a "power signal"? BTW do not start any other threads on this subject.
  12. KrisBlueNZ

    Varistor Troubles

    Hi there and welcome to Electronics Point :-) Can you upload a photo of the damaged part, and the circuit board - a picture of the whole board, and a closeup of the area around the damaged part. Then we'll have some idea what we're talking about!
  13. KrisBlueNZ

    basic question about signals

    I don't think you do. Can you explain what you think the difference is?
  14. KrisBlueNZ

    bee venom extract device

    I really hope this extraction process doesn't kill the bees. AFAIK once they sting, they die. I'm no tree hugger, but I think bees have enough to contend with, what with all the chemicals we dump into their environment. We need a lot more of them, not less. And what is the bee venom used for?
  15. KrisBlueNZ

    bee venom extract device

    48V AC RMS at 30~400 Hz is definitely enough to feel. In some circumstances, such as if your hands are wet and you touch both sides with opposite hands, it can actually be fatal, especially if you have a heart condition, but even if you don't. Everything should be thoroughly insulated and kept...
  16. KrisBlueNZ

    Schottky rectifier

    I guess I should have looked at the data sheets at the start! The HSMS2822 is not a "normal" Schottky diode and is not intended to be used as a rectifier. The first clue is the description in the heading of the data sheet: "Surface Mount RF Schottky Barrier Diodes" (the clue is the "RF" in the...
  17. KrisBlueNZ

    Circuit help with rc car

    Hi Jack! (Don't shout that too loud at an airport) Welcome to Electronics Point :-) Can you post some photos of the main circuit board. One of the underside, like you already posted but of the board only, looking directly at the board from above the centre, and edit it to show what the wires...
  18. KrisBlueNZ

    Schottky rectifier

    Hop, could you explain that terminology please? I think I understand the dynamic resistance (aka AC resistance, incremental resistance, slope resistance etc) and how it can be calculated at various points on the curve, but how can you define a meaningful "static" resistance for a diode?
  19. KrisBlueNZ

    Power Regulation Strategy

    I agree with Dave's suggestion - use a switching supply. If you always have mains voltage available, just get an "off-line" (mains-powered) supply rated for 12V and 5A (60W) output. If you need the option of feeding in a lower DC voltage, you could use that type of power supply to bring the...
  20. KrisBlueNZ

    rectifiers

    Hi there and welcome to Electronics Point :-) Household mains voltages and currents can be fatal, and based on your lack of experience, I strongly advise you to keep well away from it until you learn a lot more, including how to be safe in a high-voltage high-current environment. No one here...
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