Bubble bubble toil and trouble

(apologies to W Shakespeare for the misquote!)

This is my home made bubble etching tank which is being used to make a printed circuit board for my Mark 2, Mark 3, Mark 4 ... Mark 10 drip trigger.

I built the mark 1 drip trigger last year but it was built on prototype board and was a bit unreliable. This one is far more sophisticated.

Watch this space