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  1. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Ok I think we are getting there. So the output of B is triggered by the high to low transition of the sensors output?
  2. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Thanks Adam
  3. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    What about the pulses I asked about? Adam
  4. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Does the output of A and B repeat as long as you have a 50 Hz square wave? Or does it just happen once on the first pulse from the sensor? Adam
  5. Arouse1973

    EMC pi filter design for cs102

    We need a bit more information than that. What current and voltage rating do you need. Why do you need a filter, do you have any failure results from pre-compliance testing? Do you require common mode suppression or differential mode. What equipment is it going to be used in? Can you provide a...
  6. Arouse1973

    Potting/encapsulating material

    Could be a type of wax. Can you post a picture of the unit? Adam
  7. Arouse1973

    Best AC to DC Converters

    I have used XP Power and have been pleased with price, quality and reliability. http://www.xppower.com/ Adam
  8. Arouse1973

    np=ni^2 in doped semiconductors

    Hello Any covalent bond can be broken but in most cases it is a very strong bond. And as Ratch said the energy will be used up liberating the silicon covalent bonds and arsenic free electrons. It takes approx. 1.1 eV to free a covalent bonded electron from silicon. And about 50 meV to free a...
  9. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Hi ak Dumb blonde question again, sorry :) Is the output (U1D) suppose to have a delay before it triggers high as in your diagram? I was going to build the circuit and show what the waveforms will look like for the OP. But I had another look over the circuit before I started and thought I better...
  10. Arouse1973

    what AWG cable to use for cordless drill + car battery

    I guess the circuit needs power to operate and he is running the drill from this battery I think. I might have this wrong! Adam
  11. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    ak Is your circuit suppose to replace the 555 timer? You show a delayed output from U1D. Thanks Adam
  12. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Oh yeah another nice little circuit. Shame the OP went offline in mid flow. Adam
  13. Arouse1973

    what AWG cable to use for cordless drill + car battery

    John and Colin is correct. I found this Video and posted it for another thread. It can draw 30 Amps and it was a Dewalt Drill he was using I think. Adam
  14. Arouse1973

    np=ni^2 in doped semiconductors

    The arsenic forms a very strong covalent bond with the silicon atom when the semiconductor is manufactured at very high temperatures. It forms part of the semiconductor crystal when everything cools down and is locked in. Thermal equilibrium is when the semiconductor has no other influence...
  15. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Here me know! praise the lord! I feel it I feel it!
  16. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    0 ms delay? What is the frequency of your input?
  17. Arouse1973

    Op Amp not working properly LM324

    LOL you beat me Trevor :) Adam
  18. Arouse1973

    Op Amp not working properly LM324

    It sounds like your only amplifying the top part of the waveform, which is half 0.25 Volts. This explains why it's 2.5 Volt, and the reason is you don't have a negative supply so the output will only go as low as 0 Volts. You need to either create a virtual point for the output of the opamp or...
  19. Arouse1973

    Trigger Pulse for IC555 using Inverted Square Pulse

    Do you have a circuit diagram? What is the 555 timer doing in your circuit, mono-stable or something like that? Thanks Adam
  20. Arouse1973

    np=ni^2 in doped semiconductors

    It also may help to understand that even though intrinsic semiconductor material doesn't have any dopants, it still has active electron hole pairs generated by thermal excitation this is the ni and is independent on any dopant levels. The np product is constant because the recombination rate...
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