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  1. C

    Destroying USB devices

    I'm confused... after switching cables everything works again? A voltage surge could damage ICs but the cable? Do the cables melt or something? What happens
  2. C

    First electronics repair question

    Diodes might work or cause it to be a tiny bit slower or tiny bit faster Another option is to vary the motor speed with pwm and a potentiometer to fine tune it...
  3. C

    MOSFETs heat sinked to case power inverter safety.

    Refine your search (select international sellers)
  4. C

    Relay pulse time - milliseconds

    Take a look at this... i gave it a 1 second pulse (your door pulse) the capacitor and bleed resistor (higher the cap rating longer the pulse)
  5. C

    How to supply 5v at higher current?

    The space constraint don't forget
  6. C

    Relay pulse time - milliseconds

    1ms sounds a little small This 1 second pulse time? Do you have access to the circuit? I mean this 1 second pulse goes directly to the roller door or to a relay?
  7. C

    How to supply 5v at higher current?

    Secretive much?
  8. C

    Replacing Yamaha HTR 5650 110 to 220

    Something has to change (internal) or external transformer
  9. C

    I think I am a Technolic.

    I'm the complete opposite lol In the 90's i wished for technology we have now :)
  10. C

    1.2w/10mA LEDs

    On the pcb you showed us, i saw current limiting resistors, simply unsolder them and replace with white ones..
  11. C

    Help with resistors

    The LED is current driven, you can use any voltage over 2v however, the voltage drop across the resistor is then 7v, lower the voltage the less waste, the primary reason for the resistor is to limit the current to stop it exceeding 20ma
  12. C

    1.2w/10mA LEDs

    A white LED is a blue LED ironically, the difference is the blue LED gets a coat of phosphorus which turns it into white light! Change them or paint them lol
  13. C

    Amplifier blows power fuse

    Infact is it a power transistor? 5 pins
  14. C

    Amplifier blows power fuse

    2nd from top of photo, the transistor looks cracked from heat stress ... I'll bet you'll read a short between 2 of those pins and maybe more
  15. C

    Identify corroded diode?

    Unless you can get the schematic, it will be tricky, and the lawsuits that follow if your repairs fail
  16. C

    Identify corroded diode?

    Yup it's a zener (beat me to it!)
  17. C

    In need of Circuit help.!!

    I suppose you could buy a vibration sensor which feeds the trigger of a 555 chip, this can be used in monostable mode to light up an LED and or / buzzer A transistor version is an option too
  18. C

    Wiring LEDs with different V & mA?

    An alternative option is to buy a couple 1w LEDs to get the same amount of light
  19. C

    Power supply noisy inductor

    While working on a circuit with an inductor the other day i noticed a inductor begin to whine when it received a lower voltage/current maybe the voltage has dipped?
  20. C

    LM3!* Again? Not really... but you could help...

    What's the secondary AC voltage? 10v? (disconnect the bridge rectifier first)
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