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Offline hesammTopic starter
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« on: October 28, 2018, 11:06:04 am »
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I'm designing a PI detector.

I have a problem with the decay curve which relates to its instability. it oscillates like a thread in the breeze. The circuit is not something special. like other PI detectors with 390R damping resistor.

First I thought it might be because of the damping. So I decrease it but it did not solve the problem. I attached a video of the waveform. DSO voltage has been adjusted to 200mV to make the instability more obvious and the wave tail is clear on the screen.

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Offline Homefire
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« Reply #1 on: October 29, 2018, 08:16:49 am »
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    Huh?     What's the Problem ?   Looks pretty steady to me.   Probably just some variance in  the coil geometry as it (Moves)  Transitions from Energized to Non Energized.  Potting or  lashing the coil may help.   That signal is quite good actually.   

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