My Stirling Engine: speed check

When I ran my engine for the first time, I couldn't believe how fast it was going.

 

Naturally I was curious.

So I had to build a simple tacho to check the speed.

Bat Camera: just a wild idea!

What if I triggered a camera from my bat detector?

I'm not looking for prize winning bat photos, just a possible aid to identification.

Would the system capture anything recognisable?

BirdBox 2016: fitting the UV LEDs

Although initial testing with a bunch of UV LEDs did not look too promising, I've decided to push ahead and fit them to a bird box anyway.

They were very cheap, and I'd like to say they were easy to retro-fit into last seasons bird box.

But a wiring error resulted in a blown Darlington driver, so it took up more of my Sunday afternoon than I'd expected.