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  • julianE's Avatar
    Today, 06:02
    Thanks BeanieBots I'll make note of your suggestions. I have had very good results simulating transistor circuits using LTspice but I really need to...
    20 replies | 558 view(s)
  • julianE's Avatar
    Yesterday, 21:28
    Thanks for all the insight Alan. I'm going to set up all sort of op amp circuits with a goal of having a universal module I can connect to various...
    20 replies | 558 view(s)
  • julianE's Avatar
    19-01-2017, 20:52
    Hi Alan, Is this what you mean, LTSpice did not have TL062 Op Amp I'm using their closest equivalent. When I run the simulation I get...
    20 replies | 558 view(s)
  • julianE's Avatar
    19-01-2017, 00:59
    I went and simplified the amplifier circuit and tuned some values. All works well and is very stable. It will reliably detect a pen hitting a...
    20 replies | 558 view(s)
  • julianE's Avatar
    17-01-2017, 09:47
    I'm in the middle west, not much seismic activity. Yes, I'm familiar with P&S waves. From all I read one needs a proper seismograph to detect distant...
    20 replies | 558 view(s)
  • julianE's Avatar
    16-01-2017, 20:41
    Allen, thanks for having a look. I thought my low frequency cutoff was 1/(6.28*3.3uF*10K), 4.8Hz. I went and ran the circuit in LTspice and you are...
    20 replies | 558 view(s)
  • julianE's Avatar
    16-01-2017, 04:19
    I originally bought the geophone to detect seismic activity, it was also a bargain. Upon further reading, a geophone is not ideal for seismic...
    20 replies | 558 view(s)
  • julianE's Avatar
    16-01-2017, 00:42
    As far as timing, that's my main concern, I let my geophone with a transistor amplifier attached to an ADC pin of picaxe run for an extended time ...
    20 replies | 558 view(s)
  • julianE's Avatar
    15-01-2017, 21:43
    I would like to interface a geophone to the picaxe. I have tried using a single stage transistor amplifier feeding the ADC input of picaxe and it...
    20 replies | 558 view(s)
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About julianE

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About julianE
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picaxe123

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