Search results

Search Forums New Posts
  1. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    Say what now? I don't think I recommended any zener diodes. I've found post #54 where I recommended some fast recovery and Schottky diodes. Is that what you mean?
  2. KrisBlueNZ

    Massage chair control board help..

    That looks like a mains transformer above bridge rectifier DB102 in the bottom left corner. "Mains" transformer, as in AC mains power, not "main". Sorry, down under we refer to the AC wall supply as "mains". What do you normally call it over there?
  3. KrisBlueNZ

    Hi everyone!

    Hi Juan and welcome to Electronics Point :-) Thanks for introducing yourself. I hope we'll be able to answer your questions!
  4. KrisBlueNZ

    lm317 sub?

    If Q2 is dropping significant voltage, you should calculate the power dissipated in Q2 to see whether a heatsink will be needed. In your case you are keeping most of the voltage dropped across the LEDs, with only 2~3V across the transistor, which is good. But at 500 mA, 3V across the transistor...
  5. KrisBlueNZ

    Massage chair control board help..

    Hi Richard and welcome to Electronics Point :-) So you only have that board? The mains transformer would probably have failed pretty quickly from the overvoltage. Is that part of the rest of the chair? Can you get it tested? Probably the primary will be open circuit. Sometimes there is a...
  6. KrisBlueNZ

    atmel microcontroller with usb functions and icsp support

    http://lmgtfy.com/?q=Atmel+microcontroller+product+selector+guide
  7. KrisBlueNZ

    lm317 sub?

    No, no special requirements. You're right.
  8. KrisBlueNZ

    Car sensor

    Hi there and welcome to Electronics Point :-) Is this needed for just a single car parking space, or do you need lots of them? Induction loops are normally buried underneath the concrete. That means digging a trench near the edges of the car parking space. Is that an option for you? Why does...
  9. KrisBlueNZ

    Radio transmission and one-wire, I2C, three wire and four wire protocols resource

    Oh. Well, I don't have much experience with I2C. But I2C and SPI are both pretty well documented, and the Dallas/Maxim documentation on one-wire is also pretty clear I think. I could write an application-oriented document on SPI and one-wire, but I don't consider it a priority. If someone else...
  10. KrisBlueNZ

    Sound to light for my son's Dalek

    OK, the DC voltages on pins 1~3 are set by R1 and R12. I can't see any problem in that area on either side of the board, so you'll need to check it carefully yourself, but that's the place to start. The voltage on pin 5 should be a lot lower than 0.47V when there's no sound. You could check the...
  11. KrisBlueNZ

    Radio transmission and one-wire, I2C, three wire and four wire protocols resource

    Do you think there's a need for another document on those protocols? If you write up the sections for I2C and SPI, I'll write up the one-wire document.
  12. KrisBlueNZ

    Sound to light for my son's Dalek

    OK, I don't see any problems with the layout. That doesn't mean there aren't any, of course! But here's a step-by-step checklist you can try. Disconnect the lamps for this testing, and set VR2 to around half way. Measure all of these voltages using a multimeter on the DC voltage range with the...
  13. KrisBlueNZ

    Sound to light for my son's Dalek

    I'm finding it pretty difficult to follow those photos. I think you'll need to do the checking yourself. Does your multimeter not have a continuity check function? You can use it on ohms range (continuity will show as less than 1Ω) but it's really handy to have a meter that will beep, so you...
  14. KrisBlueNZ

    Designing a Time Delayed Relay

    Cool!
  15. KrisBlueNZ

    Designing a Time Delayed Relay

    I think I've seen Snatch but I didn't love it the way I loved Lock Stock. I'll have to watch it again! That's great you've saved yourself some trouble already!
  16. KrisBlueNZ

    Heyelp! Tapco S5 active monitor problem

    Have you made any progress?
  17. KrisBlueNZ

    Sound to light for my son's Dalek

    That's OK, it looks fine. In post #1 you said you have an LED from the "input" to the MOSFETs to earth. Do you mean you've connected an LED directly from the MOSFET gates to the 0V rail? If so, that will be causing the problem by limiting the gate voltage. Remove that LED. There's already an...
  18. KrisBlueNZ

    lm317 sub?

    The standard one-transistor and two-transistor current regulator circuits have a dropout voltage less than 1V. See https://www.google.co.nz/search?q=transistor+current+source&tbm=isch That's the NPN version with the load in the positive side. Reverse the battery and LED, and the direction of...
  19. KrisBlueNZ

    Sound to light for my son's Dalek

    OK, well that should be fine! Can you upload a photo of your construction?
  20. KrisBlueNZ

    Magnavox ZV427MG9 vcr/dvd recorder ...is file recovery possible?

    Gryd3, are you suggesting that he could remove the hard drive (assuming there is one) and put it into a PC or an external USB box? Do you know what file systems are used on hard drives in digital media recorders? I had an early Panasonic DVD recorder with a 300 GB hard drive which died and...
Top