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  1. electrodoc2

    Inside a TO-3 Transistor case

    If you use a faulty transistor and whip the top off then connect a volt meter across the base and collector whilst pointing the transistor at the sun it's a solar cell !! 8)
  2. electrodoc2

    handy tip for intefacing your PC with projects

    If someone can make this an exe file that would be great! please mail it back to me as the stand alone file.. you will need Qbasic to run this program and thats available in the win98\tools\oldmsdos directory on 98 cdrom. Qbasic works fine on 98 and all predisesors but i'm not sure about XP...
  3. electrodoc2

    handy tip for intefacing your PC with projects

    thanx again Mike. i got QB4.5 but when i try to run my program i'm getting a "String Space Corrupt". it's a shame because i've wanted my bingo program to run as stand alone, I may even make a 8X16 light box to display the numbers from the program to the people who are playing. i wrote this for...
  4. electrodoc2

    sensitive low frequency filter

    thanx alot peeps!, i can add a transistor on the end of that to flash the bulb, so that should do fine. cheers.. Rich
  5. electrodoc2

    handy tip for intefacing your PC with projects

    I didn't have to fool the port into thinking anything was connected to it i used a 386 DX 40, a 20 mb hdd with dos on it typed in Qbasic:- 10 x = 1 20 Out 888,x 30 pause .5 40 x = x+x 50 if x => 16 then x=1 else goto 20 this would revolve the stepper motor until you ended the program. the...
  6. electrodoc2

    sensitive low frequency filter

    Hi MP. Cut off frequency is appx 100 - 150 hz 12db gain would be good or 18db but i want to use a max of 1 dual opamp.
  7. electrodoc2

    handy tip for intefacing your PC with projects

    SAFETY FIRST!! NEVER CONNECT A PROJECT DIRECTLY TO YOUR P.C. ALWAYS USE OPTO ISOLATORS!!! THIS WILL SAVE MOTHERBOARD/PORT DAMAGE! Before trying this, disconect your printer it may damage it!!!! You can use your printer port as a controller for electronic projects. get QBASIC either from a dos...
  8. electrodoc2

    sensitive low frequency filter

    Hi, Long time hobbiest first time op amp user! PLEASE would someone help as i cant get to grips with the formula for bandpass filters/gain or anything regarding electronic filters.! All I want is a phisicaly small high gain low frequency filter circuit which will use a xtal/moving coil mic to...
  9. electrodoc2

    Triggering a 555

    Hi Si.. you need to have the tilt switch normally open when the bike is on one side, then have the tilt switch put a + supply onto the trigger (pin 2) of the 555. the output will then go high for the duration of your CR network after the bike is left alone. I'd also put a high value 4k7...
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