Well, that was a satisfying result

I modified some 110V kit to make it work on 220V. It had 5 110V fans, so I converted to two series pairs plus a new 220V fan. So far the only problem has been with the new 220V fan...

The thing is with some of this old kit, it will run for many years they are so well built. I used a 3 pole 4 way wafer switch and it is long time since I last had to work one out, I couldn't even think how to start working it out. Anyway, it worked :-)

I remember having to specify bespoke multipole rotary switches - the suppliers' data sheets were dreadful, and it was all done using arcane codes. Sometimes we got what we wanted...

Chris

yerrs. The came a point at which a single pole switch, a PIC and some reed relays suddenly was much cheaper.

At around 15, i got a brilliant idea to build myself digital clock, using those numister neon displays and a series of wafer switches driven by a clock motor. I couln't get it to wor, but it kept me occupied for weeks. :D

Around 15 I was involved in the school project to make an automatic bell-ringer. Used a cylinder of aluminium with holes into which screws were placed to indicate bell-ringing times, a stepper to rotate it, a multiple divider to get from mains frequency to a suitable rate for stepping, ...

All good fun. Most metal parts cast or made by us.

These days you can go to the manufacturer's website, build up a virtual version, test it operates correctly and then it'll give you the appropriate ordering code.

SteveW