27 Sep
2012
27 Sep
'12
4:47 p.m.
On Thu, 27 Sep 2012, Tony Duell wrote:
Some older UK microwave ovens had a 'power
control' which was an
electromechncial pulse width modualtor on the input side of the magnetro
trnasformer. Said device consisted of a motor that rotated onece very
couple of seconds, a cam arrangelemt and a mechnical latch that operated
a mciroswitch. At soem point on the rotation the swithc closde, the pint
where it opened dependded on the setting of the 'power' control.
If you used the input sine wave instead of a motor, you could simulate
that with an SCR!