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  1. C

    USB Wifi Dongle Issue

    If it had not of come to life after applying pressure i'd have given up by now
  2. C

    40 Hz LED

    The only real down side is the high voltage required to break that reverse breakdown barrier, if it worked with say 2 or 3v that would be nice, i'll breadboard it and do a circuit for around 40hz tomorrow
  3. C

    USB Wifi Dongle Issue

    Haha yeah i shall :)
  4. C

    USB Wifi Dongle Issue

    I refuse to upgrade my PC case until i find a motherboard that can no longer fit :)
  5. C

    USB Wifi Dongle Issue

    I spent 10 bucks on a wifi dongle, and well returning bad electronics is no where near as much fun as trying to repair bad electronics.. after about 4 hours of assuming it's me installing the wrong drivers, rather than a hardware fault, let me explain, i plug in the wifi dongle, it detects, usb...
  6. C

    Advice/info please - my surround sound has stopped working

    So the relay energizes you hear the click and then the relay drops out... Power supply fault by the sounds of, you could be lucky take some photos inbthe area of the clicking noise (a little plastic box) careful not to touch any mains voltage, power up listen and locate, pull the power cable...
  7. C

    transistor for open-drain / open-collector 25kHz PWM

    The transistors datasheet should provide you with the maximum frequency to use.. But it's normally up in the hundreds of khz the arduino is not going to be an issue for the cheapest of transistor
  8. C

    40 Hz LED

    I am, however the 2n2222 costs around 0.02c? Do you happen to know what kind of life span it will get? - I'll perfboard one up and stick it in the corner somewhere and wait, and wait....
  9. C

    Overkill LEDs and PWMing with electric switch

    Why not use a regular transistor over a fet? They're cheaper
  10. C

    40 Hz LED

    At 40hz you could exploit a 2n2222 transistor and a capacitor to do it
  11. C

    Electronics vs Temperature

    I typed in a C for Celsius, not everyone lives in America
  12. C

    Blinking lights with RF from nearby cell phone antenna

    A series of low voltage drop diodes stood up on their legs in series and an LED works fine for older 2G signals from your phone but 3g/4g don't work as it's a much shorter wavelength But considering how close you are you might need a resistor on the led lol
  13. C

    Electronics vs Temperature

    No i got your attention by a vague title, someoneon fb asked an interesting question which brought up a 2nd question 1. Why do cpus die at around 140c when there's not much that melts, all i can think of is the trace lines melt or solder ? Why can't we run them at 300c and forget the fan, maybe...
  14. C

    Overkill LEDs and PWMing with electric switch

    0.5w/12v not much power Any power transistor (npn) and a 500ohm resistor from the 555's pin3 to the base of the transistor. .
  15. C

    Overkill LEDs and PWMing with electric switch

    Oh i'd love to see a mechanical relay try that, you'd need a SSR / Triac for switching mains... If not mains use a transistor that can carry the current required
  16. C

    Plasma Globe power supply change from AC to DC

    After ac is passed through the rectifier, it might be seeing closer to 16v there's a possibility the whine comes from lack of voltage..
  17. C

    Parallel Bridge Rectifiers. .

    Alright, ok i'm with it now and why i got confused... All sorted, 4* 4amp diodes on the way :) Thanks!
  18. C

    Parallel Bridge Rectifiers. .

    Alrighty then, 4 x 2 amp .6v diodes it is! Shame, i wanted to use these useless 2 amp rectifiers, all sorted, cheers
  19. C

    Samsung PN60F8500 Plasma TV power board

    Have you tested for shorts across those transistors? Not sure what they are, could be a shottkey rectifier... But you need to test them
  20. C

    Monitor repair

    Could be simple as a fuse, 1 bad resistor, a shorted anything... No obvious signs means you're going to be busy :)
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