Ah, the joys of soldering.
Too bad these circuits come pre-etched and most of the complex workings are hidden inside those ICs.
This first one is supposed to be a radio bug. There's a mic and it transmits on FM - the coil of black wire is the antenna and you can change frequency manually and in analogue by screwing that green component.
Below is a dice thrower. It just works by changing LEDs very fast (i.e. 1,2,3,4,5,6,1,2,3,4,5,6, ...) and when you press the switch it stops. Then when the switch is pressed again the LEDs start flashing again. It needs to flash really fast (so fast that all of them look like they are on at the same time, albeit dimmer) so you can't cheat. Also, one of the ICs count in base 10 so it needed to be converted to base 6, or loop from 6 to 1 and not 7.
Have yet to uncover my hand drawn circuit from year 8. I had to use a marker and place it in the electrolytic tank. The copper was oxidised to become soluble in the solution and only the copper under the marked areas were left. Hurray for old-school stuff. =P
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