Search results

  1. H

    timer to trigger latch

    If you would try my first circuit you won't need a 555 at all. You asked for simple and I gave it to you. The KISS method applies here. Almost any NPN Transistor will work aslong as it is able to handle the Amp Draw of your coil
  2. H

    timer to trigger latch

    Here is one from the Engineer's Mini-Notebook - Basic Semiconductor Circuits
  3. H

    timer to trigger latch

  4. H

    timer to trigger latch

    This could do the job. Use the Solenoid in place of the Relay in the Circuit.
  5. H

    help me plzzzzz

    how about a Telegraph System. That is the device that started the whole field of engineering you are going in to.
  6. H

    Water Level Indicator

    Too bad this "Single Poster" is not participating in the thread he started. Maybe we are done here.
  7. H

    Water Level Indicator

    The capacitors are the trick here 74HC14 Datasheet http://www.nxp.com/documents/data_sheet/74HC_HCT14.pdf http://www.fairchildsemi.com/ds/MM/MM74HC14.pdf 74LS14.pdf
  8. H

    Water Level Indicator

    That is a great point Hero. Maybe my cork idea isn't so low tech after all. LOL ???
  9. H

    Please help

    Calm down Mr Hero. I am just thinking outside of the box with a different idea. sonic generator http://www.gs-harper.com/Mining_Research/Power/sonics004.asp http://technoccult.net/archives/2010/01/19/sound-generator-could-kill-humans-at-ten-meters/...
  10. H

    Please help

    Why not use a high wattage Amplifier and a speaker thru a tube to transmit the lower frequency? Kind of a reverse super ear.
  11. H

    Water Level Indicator

    http://www.free-circuits.com/circuits/alarms-control-timers/33/hot-water-level-indicator http://zonaelektronika.blogspot.com/2010/04/water-level-indicator-with-alarm.html http://www.engineeringslash.com/digital-ic/water-level-indicator/water-level-indicator.html...
  12. H

    Water Level Indicator

    Here are a couple more.
  13. H

    Water Level Indicator

    Here is my LowTech Approach
  14. H

    Sansui AU 2900 amp service manual wanted

    I posted it at http://www.freeservicemanuals.net/index.asp?upload=true
  15. H

    Sansui AU 2900 amp service manual wanted

    I have a PDF file but can not post it here. Too big
  16. H

    electronics input for resturants

    I think touch screen would be more sanitary. The service provider could wipe it off when they clean the table. Just like the screen they use in the Pet ID tag making machine at the Pet Store or Wal-Mart
  17. H

    Diode

    Looks Like 1 Diode (03) 1 choke (8D00 ) 1 Resistor (86)
  18. H

    Depletion mosfet

    Mouser has a great selection DN2540  DN2540N5-G Here is the Datasheet http://www.supertex.com/pdf/datasheets/DN2540.pdf N-Channel Depletion-Mode Vertical DMOS FETs http://www.mouser.com/catalog/637/526.pdf...
  19. H

    New to electronics

    In most cases they are interchangable. L165 Datasheet http://www.eng.yale.edu/ee-labs/morse/compo/datasheets/1317.pdf MJE3055T Datasheet http://www.fairchildsemi.com/ds/MJ%2FMJE3055T.pdf http://www.onsemi.com/pub_link/Collateral/MJE2955T-D.PDF
  20. H

    c828 transistor

    That is it! 2SC828 Here is the Datasheet http://www.electronics-lab.com/forum/index.php?action=dlattach;topic=22239.0;attach=18139   2SC828  Cross Reference   2N3710    2SC1815    2SC182    2SC263    2SC350    2SC373    2SC374    2SC537    2SC640    2SC712    2SC713   ...
Top