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  1. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    Hi Harald What I meant was I don't know why the original circuit didn't work. Switching the same net shouldn't have done that. Cheers Adam
  2. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    Add a small resistance as shown. Don't know why it's doing this but a 0.1 Ohm won't effect circuit operation and solves the problem. Adam
  3. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    That's a very good idea John. I think some arc suppression across the contacts is worth mentioning. Adam
  4. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    This one, ask away! Adam
  5. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Yeah it would be good to give it a go. We can always tweak the circuit if we need to. Sometimes the simple circuits are the best, sometimes not. No harm in starting out simple though. Adam
  6. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Sorry Chris I gave you the wrong timings. It's about 0.5 s with a 22 K. If you change this to 47 K it's about a second. But the downside is it will take the relay a little longer to turn off. The MOSFET will heat up a little bit more, but for that length of time it will be fine. Adam
  7. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Hi Chris Resistors are Ok to be standard metal film 1/4 W. The problem with going too high is that it will take longer to come on in the first place. If the switch is not coming on as constantly as you would like it then it may struggle to come on in the first place. You could change the...
  8. Arouse1973

    sample and hold pulse source?

    I like that idea, never tried it myself with a Log pot. Adam
  9. Arouse1973

    sample and hold pulse source?

    Nice web page, your going to be Colin's best friend now :) Adam
  10. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Here is a much simpler circuit using a MOSFET. The MOSFET is a bit over kill but should work Ok. Feel free to look for another one if you want. The circuit switches on in about 100 ms and off in about 50 ms. To increase the turn on and turn off time increase the value of C1. Adam
  11. Arouse1973

    Need help reverse engineering a PCB

    LOL 555 Timer. Yeah I doubt that also. This is going to be a dedicated IC, could even be a special made for them. I am guessing the 6 pin device is some kind of switcher? I think the only way your going to be able to work this out is to get a data analyser and see what data is sent when power is...
  12. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Yes C2 is for supplying enough current to the base of the transistor when the switch break momentarily between vibes. The transistor I was thinking of using is a bit overkill as far as current handling goes, I didn't know what relay you were going to use. But now I do I can use a lower power...
  13. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    This is as about as simple as it gets. U1 is your vibration sensor. We might need to modify the circuit depending on how long the switch stays closed for in between vibrations. You will need to choose a transistor that can drive your relay and also the diode needed will depend on the relay also...
  14. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Ok so yeah I found the same switch, I think it might work. Just putting a simple circuit together for you. Adam
  15. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    I think you make perfect sense. Let me see if I can find some others for you. Adam
  16. Arouse1973

    will a basic buffer be sufficient?

    So I think the answer is no, you are just replacing the current POT with different ones with a different setting. As far as the circuit is concerned all you have done is adjust the POT. Adam
  17. Arouse1973

    How to power an induction hob coil

    You may not need to move it very far. Does it need to be solid steel? What about a material change? What about a small heat sink? Have you thought of drilling some holes in the material? Adam
  18. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Hello Yes indeed, there are literally hundreds of vibration sensors out there with varying sensitivities. Where are you based, what electronic components suppliers do you have where you are? Adam
  19. Arouse1973

    Two potentiometers on a pulse width modulator

    My first thoughts are to control the mark and the space durations, but not sure without a circuit diagram. Do you have a circuit diagram or can you link to a similar one. Adam
  20. Arouse1973

    How to power an induction hob coil

    Does the plate need to be steel? Can you increase the thickness of the plastic? Can you also take some pictures of the HOB circuitry so we can have a look. Adam
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