Search results

  1. F

    building Hi-fi speakers

    so for the past 5 years i've been putting up with my lousy PC speakers that i bought from a thrift store. i've always wanted to replace them, both for reasons of better music listening and that it doesn't match with my overall black PC. i also want a long term device so i've always had my eye...
  2. F

    Replacing li-po with li-ion battery on small device?

    so i bought this cheap portable device and it worked ok for the first week. then i started noticing it would get discharged more and more quickly, until it doesn't even power up. i reckoned that it was a battery problem. so i wanna replace it. i don't have any more spare li-po battery, but what...
  3. F

    UV curable solder mask

    if the solder mask says it's UV curable, is there any other way of curing it? i don't suppose you can just wait and let the solvent evaporate out... would leaving it on a high temperature, say in an oven or hot air work??
  4. F

    excess supply current from linear voltage regulator

    say i have a linear voltage regulator set at 9V, and current the and is 1A, which is constant and i can't change. and i'm using it to power a small device that runs at 9V, but on average only consumes 350mA. is there a good possibility that the linear regulator will overload the device with...
  5. F

    diodes with breakdown current instead of voltage breakdown

    i know this is a stupid question but i'll ask away anyways... are there any diodes that instead would have a specified *current breakdown* rather than a voltage breakdown? i know it's stupid coz the current would have to flow first to know the amp to know when it should break, but the diode is...
  6. F

    a site that post different components but functionally are almost identical

    so i need 4 1N4004 diodes but all i got are 1N4002, 1N4005 or 1N4007's, would they do? so, just to expand the question are there any site that post comparatively different electrical components, but are electrically (functionally) almost identical that in most situation, they can be...
  7. F

    variable DC power supply

    i've always wanted a variable power supply; not just for testing... possibly powering my other projects, some of the electrochemistry that i dabble with, charging my lipo and lead acid batteries, etc, etc... problem is, good ones are in the $90-$150 range (even on ebay) and the cheap-ass as i...
  8. F

    heavy duty, realiable dc power supply

    been scouring the web for a good diy dc power supply that can power a lot of my experiments. so this is the what i settled on: http://www.eleccircuit.com/high-power-supply-regulater-0-30v-20a-by-lm338/ so, does anyone else know of a better design?? i really don't have the knowledge to analyze...
  9. F

    timer to trigger latch

    i need to have a really small timer circuit that would trigger the closing of a hinged mechanism. not much, but i want it snap shut really fast. so i was thinking of using a simple electromagnet that would pull back the hinge. the timer has to be small and can be very crude. i'm not asking...
View older results
Top