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  1. GPG

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

    Now that's curious the file got uploaded from gdrive
  2. GPG

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

    Its late. anyone want to check this. It leaves GND output Dont know if that matters, Had trouble uploading so I stuck it here; https://drive.google.com/file/d/0B3RB_KSj2zHdcEZfMVJEZS05cWs/view?usp=sharing H11f! here http://www.farnell.com/datasheets/94958.pdf
  3. GPG

    china circuit over voltages, standby

    Use an isolating transformer, the primary side is Hot.
  4. GPG

    Motor to 3phase connection compatability

    Or get 3phase wired from mains. This all hinges on the motor windings being intact. EDIT Then again:http://www.wolfautomation.com/products/25686/high-performance-compact-drive-18-to-20-hpbr-fuji-frenic-multi
  5. GPG

    Measuring current using current transformer ring type

    Used 1M as input impedance. 10K in estebans diagram not needed 50Hz 1A RMS.!Ω Load..Simulator Simetrix
  6. GPG

    footstep power generator

    https://en.wikipedia.org/wiki/Human_power
  7. GPG

    Measuring current using current transformer ring type

    The ADC pin should be a high impedance? Sim works with 1M, 10K superfluous.
  8. GPG

    Heating elements for own built terranium

    The resistor.The 78s12 is good for 35Vmax.. Your diagram shows the secondary connected to ground? This is half-wave. Does the secondary have a centre-tap?
  9. GPG

    Surface resistance

    https://en.wikipedia.org/wiki/Sheet_resistance
  10. GPG

    Problem in LM2576 circuit

    This could be your problem.
  11. GPG

    Electronic help

  12. GPG

    Programable commutator

    If you reduce the supply there are some analog switch ICs that will handle ~ 200 v
  13. GPG

    Activate transistor with piezo disc

    Need dottson to implement and report. Have just stopped riding a bike too many injuries incl broken mandible. Too old for that s**t
  14. GPG

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

    What are the spindles? How much current.
  15. GPG

    Heating elements for own built terranium

    Check ,after removing the supply!! if the triac is shorted.mt1 to mt2 Is the only load the bulb or do you have the heater in parallel Doyou have the circuit/layout?
  16. GPG

    Activate transistor with piezo disc

    https://www.google.co.nz/search?q=9v+battery+discharge+curve&biw=1024&bih=635&tbm=isch&imgil=QLlt4Y_sYFrD7M%253A%253Bgh9DLppHHW1HGM%253Bhttp%25253A%25252F%25252Fwww.powerstream.com%25252F9V-Alkaline-tests.htm&source=iu&pf=m&fir=QLlt4Y_sYFrD7M%253A%252Cgh9DLppHHW1HGM%252C_&usg=__dAZ0LBzKLYSfpx1HqC...
  17. GPG

    Activate transistor with piezo disc

    It only has to drop to a little less than the avalanche voltage which I suspect is close to 9V. hence only operates on a new battery until it reaches the flatter part of the discharge curve resulting in no noise, Some input from OP would help.What voltage across the be junction when it is...
  18. GPG

    Car batteries in // with charge controller

    No problem if they are the same chemistries. Think that yours are flooded lead/acid?
  19. GPG

    Activate transistor with piezo disc

    OK Red pin3 (simulated), Green cap +, Veb 9V (estimated) If the current does not go to zero add a diode forward biased to the transistor or the cap charging diode.. Be good to have the voltage that the transistor breaks down at.
  20. GPG

    Activate transistor with piezo disc

    Initial condition pin3 low
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