The obligatory test circuit

Well, it had to be done really :) what else could I choose but an NE555 LED flasher.

A few tips: 

1) don't use 20year old PCB material. The board was warped, copper filthy, copper soft and difficult to mill. 

2) don't try to use 25year old resistors that you've found in a box.

3) put on your glasses before drilling the holes in the board (I thought I'd save time and not CNC the holes....)

Strangely enough, all of this combines to make a bit of a mess. Almost impossible to solder. I've never seen better examples of dry joints. Oh well, I got there in the end. Toggling LEDs.

It's running on 3xAA batteries in the pack under the PCB. 

(Ignore the fragments of text on the board - nothing to do with this test!)