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Attention Avalanches !
Nanosecond current pulses arise from avalanche breakdown in virtually any diode. Here some experiments exploring these in Zener-diodes, LEDs and finally photon-counting avalanche photodiodes are desribed together with a few tiny circuits useful in this context. Questions like what happens to a LED subjected to a (large) reverse voltage and the issue of their non-linear current intensity relation (at very low current its quadratic!) are answered.
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