In article ,
Paul wrote:
It's hard to control the "intermittent" connection of
a battery well enough, to ensure safety or a lack of damage.
You might use or need an "interruptor" ("joy buzzer"),
as a means of exciting the coil.

Think of Kettering ignition. Points, and the engine cranking. The points
will be closed for much the same time as 'flicking' a battery across one.

A car ignition coil will sustain the full battery volts across it for a
while. Certainly a lot more than a few seconds.

--
*You're never too old to learn something stupid.

Dave Plowman London SW
To e-mail, change noise into sound.