[Swlug] DIY Geiger counter

[Rhys Sage]

I had a few minutes so I went and had a look at the transistors. Mysteriously, half an hour vanished.

My BC547s seem to have B331 marked on them.
My BC517s seem to have F.Job marked on them.

I understand what you mean about things having more interesting properties at the extremes of use. At one time I was interested in building a high-voltage microflash. I researched that and got myself a copy of the handbook of Chemistry and physics. That revealed interesting conductivity properties of various normally non-conductive materials. I do have a half-completed microflash that's designed for low voltage use. That just needs a fast transistor capable of switching 200 white LEDs on and off in 1/250,000th of a second.

Rhys Sage