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  1. Externet

    THIS is a good paint job...

  2. Externet

    Suggestions on analog galvanometer ?

    Unless better options you may suggest; am after a as I have to glue a 15mm x 10mm x 1mm mirror to its pointer. Will be driven by a 7555 triangle wave repeatedly at 1 Hz. Scale and housing is irrelevant, unnecessary. Am after the movement only. Do you see an alternative way to make such a...
  3. Externet

    Which video adapter to use ?

    Hi. Is there a converter gadget to display this RGBIHV video output into a composite monitor input ?
  4. Externet

    Lithium ion canteen...

    Hi. How whacko would this be to use as a simplistic external 'canteen' supply for a digital camera that uses 2xAA cells that not last much ? Currently am using the right portion only to supply the camera and has worked very well for 4 years, and I transfer the 18650 to recharge on its...
  5. Externet

    Driving assist in modern automobiles...

    Some vehicles implement braking and adjusting speed from sensing traffic ahead. It that by optical, imaging recognition ? Or is it by radar that should work in fog ?
  6. Externet

    1960? B.C. (before cassettes)...

    Hi. Saw yesterday on an old television program, a short-lived audio tape recorder format NOT open reel-to-reel, NOT '8-track' type of recorder and tape cartridge, before the 'compact cassette' by Philips. Was not a wire reel either. May have been a Hollywood trick of the era, but I do faintly...
  7. Externet

    What determines compatibility in Android phones...

    Hi. Is it the availability of power supply outputted at the USB port ? Is it data acceptance into the USB port ? Both ? More ? For this gadget ---->...
  8. Externet

    Organic LEDs...

    OLEDs in 'discrete' trough hole 3mm... do they exist ?
  9. Externet

    Laptop lid sensor...

    Hi. Posting here because it is... well, a sensor. Does anyone know how the lid closing is sensed in a Compaq CQ57 (Or similar HP 630, HP 635...) My previous laptop suffered of intermittent display from wear of hinged wiring; and I used a magnet placed on top of the sensor to put it to sleep...
  10. Externet

    Single to three phase... sort of...

    Hi. In what conditions would this make three phase from single phase ? Feeding single phase at left, using the right ends as three phases for Wye motor with neutral center. ¿?
  11. Externet

    Can you suggest internet television hardware ?

    Hi. Looking for some gadget that can be hardwired (ethernet) to my internet provider cable modem ; and allow my 'smart' TV, browsing television channels that stream live programming, like national broadcasting channels of any and many countries. Not Hulus nor Netflixes nor anything force...
  12. Externet

    Anyone familiar with pendulum clock mechanisms ?

    Hi. Trying to find if these common AA operated mechanisms are self-starting or need a first swing by hand to start. Or the pendulum mechanism alone :
  13. Externet

    Darlington transistor suggestion ?

    Hi. Looking for the least Vce at saturation for power switching, will conduct half Ampere Ic maximum. 12Vce maximum, PNP or NPN. Have a bunch of old non-convincing TIP121. Cannot use a mosfet; gate voltage too low to drive it.
  14. Externet

    Considerations to make this contraption work ?

    Hi. Made a block diagram sketch as shown below. Intention is to have the LED fully energized only during the rising of the 1Hz sharkfin waveform until it reaches 2.5V level, and off when the waveform at 'C' decreases by the comparator discharging it. And the coil proportionally energized with...
  15. Externet

    Snap action night light...

    What considerations should be taken to build a dusk-to-dawn switch that will turn fully on abruptly at dark instead of gradually ramping on ? I prefer to use a phototransistor and a mosfet. No LDR, no transistor. Will turn on a tiny 3V motor, no leds.
  16. Externet

    Magneto kill terminal...

    How does it work ? Grounding it kills spark to shut down an engine like in a lawn mower. What is the potential on that wire when running ? Or, is there many flavors ?
  17. Externet

    Garden lights working on 18650 lithium single cell...

    The common variety of solar garden lights use a dedicated four pin IC to manage operation. Is there a similar single IC for garden lights that use a lithium cell ? Or modifying one to handle a 5V panel and a lithium cell ? Edited. Sorry, goofed by not searching first... The complex and the...
  18. Externet

    Recent forum activity...

    Hi. Is there any data to compare if the forum activity has increased or decreased after the last changes a few months ago ?
  19. Externet

    Modifying automotive alternator windings...

    What to expect if the three windings in a plain automotive alternator are rewired to a series connection ? Would it yield higher frequency single phase ? Would the output yield higher DC voltage after a bridge rectifier ? Would it release the smoke if windings get paralleled instead ?
  20. Externet

    Is there a name for this type of motor ?

    A kitchen mixer in the sixties had a variable mechanical speed control that changed the angle of the stator brushes by sliding a lever. Tried to fix it as a kid when failed but did not understand how it worked. And still not. So, decided to ask now, just for curiosity. Found a picture, here it...
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