Partly assembled circuits. Each to be used to trigger a stop-clock, and make a buzzer sound, and/or LED light up. They're part of a reaction timer experiment that some Psychology classes will be using on Wednesday, and hereafter... hopefully. They'd looked into buying some commercially available ones. But the $189 price tag - each, before carriage and VAT - was too much of a shock.

Initial prototype had problems, and was dropped for something less sophisticated. Time for tinkering was running very short. Much simpler design seemed to work. Just had to make one to be sure. Rapid design of the circuit board, and then made a single one after hours on Friday evening. Assembled, wired up and tested today. Luckily there was only one minor issue. Much to my relief, it works. That knowledge lifted the pressure, a bit. Just have to create three more working ones for Wednesday. And then there's a couple of less sophisticated things to be created...

Photo taken just before midnight. It's been a manic and stressful day, and I'm not normally soldering the likes of this in my kitchen, for work, until this hour. Thank heavens.

Lunchtime Blip hunting has been curtailed recently, and the weather's been looking great out there. Maybe next week. With something new too, if tomorrows car MOT isn't like last years - very costly.