In article ,
Andy Hall wrote:
You can buy variable delay relays from RS etc, but they're far more
expensive than making your own.

I used a multifunction electronic staircase timer (RS 277-3520) - £18;
for a similar application.

It seemed to me that by the time I had bought the bits, put them
together, got a small power supply, put the whole lot in a box, it
would approach this on parts before considering the time taken.

I was basing my view on the fact that anyone capable of making such a
thing would very probably have many of the parts needed simply lying
around waiting to be used. Or perhaps that's only me. ;-)

--
*I will always cherish the initial misconceptions I had about you

Dave Plowman London SW 12
RIP Acorn