On 12/04/2020 11:14, John wrote:
On Sun, 12 Apr 2020 07:12:56 +0100, Jim GM4DHJ ... wrote:

On 11/04/2020 21:14, Bob Eager wrote:
On Sat, 11 Apr 2020 20:10:54 +0100, T i m wrote:

Most of my recent 'electronics' projects have revolved around the
Arduino micro controllers but there is also a certain purity with
something that just works made from discrete components.

I built one of these, for fun (it does work):

https://shop.evilmadscientist.com/652

how old hat is the triple five timer.....

Or even Dekatrons...takes me back.

I came across some of those 42 years ago in the CEGB's
private telephone network, replacing in some way either
Uniselectors or Strowger switches.

The interesting thing is that there was a low power
incandescent bulb permanently lit inside the cabinet
and when I queried this, ws told that it improves the
behaviour of the Dekatrons, but I guess that was because
of the background heating it supplied rather than
some optical effect?