Search results

  1. F

    2 pin compact fluorescent lamp to 4 pin socket?

    i'm trying to make a cheap UV exposure box... this time, only for curing solder mask.
  2. F

    extending an CFL electronic ballast

    i don't think you read through the listing page description: Lamp Configurations        (2/1)  CFQ/M13W/G24q        (2/1)  CFQ/M13/GX24q        (2/1)  CFS16W/GR10q (2D)        (2/1)  CFS10W/GR10q (2D) 4-pin lamp        (2/1)  CFT9W/2G7        (2)     CFT7W/2G7 - it lists CFT9W and 2G7...
  3. F

    2 pin compact fluorescent lamp to 4 pin socket?

    you mean to say i should've gotten these ??: http://www.ebay.com/itm/321293131731  (36W) about $~28 total (price + shipping) -- hardly inexpensive. i wasn't just buying any CFL (which are around $~7 or so), these are UV lamps. well, the four 9W "old" UV CFLs that i bought were practically...
  4. F

    extending an CFL electronic ballast

    i`m thinking of buying this ballast http://www.ebay.com/itm/200971855385 to power 2 of my 2pin 9W UV CFLs: http://www.ebay.com/itm/331138643631 it says it can drive two 9W CFLs at the same time.... but i wanna push it and probably drive more (maybe 4 in total??)... can it be cheaply done...
  5. F

    2 pin compact fluorescent lamp to 4 pin socket?

    you probably thought i bought these: these are what i got (CFLs): http://www.ebay.com/itm/331138643631
  6. F

    2 pin compact fluorescent lamp to 4 pin socket?

    so i got these 4 CFLs: http://www.ebay.com/itm/161173123039 they are 2 pin and i don`t wanna buy a ballast for each and i think we have a few busted screw-on CFL () in a box in our garage. so i thought i could just rip off the electronic ballast off the busted screw-on CFLs and then connect...
  7. F

    high frequency audio amplifiers

    i'm looking for schematics optimized for high frequency (2,000-20,000 Hz) audio amplification. or would most other "hi-fi" amplifiers would do the job as well?? i'm new to electronics.
  8. 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...
  9. 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...
  10. 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??
  11. F

    excess supply current from linear voltage regulator

    the datasheet says it has an output of 1A, so i thought there might be a chance it'll try to compensate to maintain that current. though you are right, it'll violate ohm's law.
  12. 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...
  13. F

    diodes with breakdown current instead of voltage breakdown

    no. there are no subliminal messages ( >"breakdown" <-- ??)... so if hesitant, please still reply.
  14. 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...
  15. F

    variable DC power supply

    instead of N*L, it's L/(N^2) and L = 3.742mH. sorry. my bad. can't even do simple algebra.
  16. F

    variable DC power supply

    well, nobody replied to that suggestion, if silence means "yes", then i suppose no one's objecting. actually, instead of 2 permanent magnet toroidal core, i think i'll just share 1 core -- each polarity winded in reverse. that should save space and be more efficient. i might also change from a...
  17. F

    variable DC power supply

    the first section, the rectifier, since it's gonna be general purpose, i decided to be a capacitor-input filter. i already decided on 12mF on C1, since that's what i already ordered online (and the best i could get for a hefty $16, EDIT: but worth any penny! digikey, i love you! i'm sucking...
  18. F

    variable DC power supply

    thnx xristost! i'm thinking more of using 3 different PCBs for this design rather than print it all in 1. 1) rectifier, C1 section -- this plugs in directly to my oversized transformer and goes to a separate enclosure box i'll be putting the main PSU. this is done so that it can be reused for...
  19. F

    variable DC power supply

    i know this is a stupid question, but i'll go right ahead... i understand that's IC1A, IC1B, and 2N3055 mainly are regulating the voltage and current, can i swap them in the future with switching mode components/assemblies to increase efficiency??
  20. F

    0-30 Vdc Stabilized Power Supply

    i know this is a stupid question, but i'll go right ahead... i understand that's U2, U3 and Q4 mainly are regulating the voltage and current, can i swap them in the future with switching mode components/assemblies to increase efficiency??
Top