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  1. GPG

    Mixing Woodworking and Electronics

    Like this? http://www.dutchforce.com/~eforum/index.php?showtopic=37322&hl=mill
  2. GPG

    How to make a trap?

    From anywhere on the planet where both have coverage.eg: http://www.ebay.com/itm/EU-Phone-Call-SMS-SIM-Remote-Control-GSM-RELAY-Quad-Band-Smart-Switch-Controller-/271924406699
  3. GPG

    how to find out current in each resistors

    Calculate the total resistance of the 3 resistors. multiply by the current. this is the voltage across them. I = V/R for each resistor.Don't forget the .1Ω when calculating the current
  4. GPG

    IR Sensor

    Seems to be for detecting the position of the pendulum.
  5. GPG

    Simple LED timer circuit

    What current for the led. Or a link to data
  6. GPG

    Simple LED timer circuit

    You mean darlington? Szilaki might be useful.
  7. GPG

    Simple LED timer circuit

    6v is close to the wind datasheet wise.. The unused inverters can be wired in parallel to provide increased current capability IE one for the time and the others as drivers. The input/output transitions will be fast enough to not worry the chip.. A 555 could be used to switch itself off after...
  8. GPG

    momentary +12VDC on input to flip the polarity of +12VDC on output for 10 seconds

    Revision invert trigger.Any small signal NPN will do.
  9. GPG

    gain amplifier

    Needs to be a rail to rail input/output amp
  10. GPG

    ac motor pump control using microcontroller ?

    http://www.vishay.com/docs/83627/il410.pdf
  11. GPG

    Need to supress 0.5sec pulse for 0.5sec, then output

    Does the central locking have a locked/unlocked indication signal?
  12. GPG

    Heating elements for own built terranium

  13. GPG

    Mechanical Counter - Debounce

    Are the contacts floating ? A picture would help. A 555 makes a good schmitt trigger and suits long close/open times.
  14. GPG

    Programable commutator

    https://www.google.com/search?q=high+voltage+analog+switch&ie=utf-8&oe=utf-8#q=high+voltage+analog+switch+200v
  15. GPG

    climbing indicator circuit

    http://www.ti.com/lit/ds/symlink/lm2907-n.pdf with the 3914
  16. GPG

    Mechanical Counter - Debounce

    Whats the timing involved in the contact?
  17. GPG

    momentary +12VDC on input to flip the polarity of +12VDC on output for 10 seconds

    You could use a small MOFET for the relay drivers, Whatever you are happy with,As long as it handles the current without much loss
  18. GPG

    momentary +12VDC on input to flip the polarity of +12VDC on output for 10 seconds

    R3 C2
  19. GPG

    momentary +12VDC on input to flip the polarity of +12VDC on output for 10 seconds

    Update. Diodes 1N400x Q1,2 depend on relay current R6 R7 added.
  20. GPG

    Radiogram, no sound

    Did you contact http://www.radiomuseum.org/r/regentone_arg80arg_8.html for a schematic
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