My logic circuit is a nice, simple NAND gate to start this off:

The transistor circuit is one that I’ve not tried out before, I’ve simulated it using Circuit Wizard in my previous post so now time to bring it into the real world:

 Next is the monostable:

And lastly the beast… The binary to decimal counter:

I’ve built and tested each one, they’re functional and ready to be maliciously tampered with Steve has volunteered to be the saboteur and after handing over my lovingly put together breadboards *sob* he has made a total of 10 faults. Steve has kept a record of everything he’s done so I can compare notes with him once they’re all working again. On with my protocol then…