"Andy Wade" wrote in message
...
On 13/02/2014 19:53, Jim K wrote:
http://www.tlc-direct.co.uk/Products/SMFLA01.html

Coo how's it do it? Whatever it does? ;-)

It's just a capacitor, possibly with a shunt bleeder resistor for safety
and possibly with a small series resistor to reduce peak currents and save
the switch contacts.

Wired across the lights it will present a low impedance in comparison with
the leakage path through the stray capacitance in the wiring and any
semiconductor switch (triac). Hence the voltage appearing across the
lights when switched off will be too small to lead to any flickering
effects or the like.

It's a useful item to know about, with wider application then just the
Smiths/Timeguard products. Flickering CFLs, unwanted illumination of neon
indicators, etc.


I would have thought that it was just a cap and resistor in series. I must
buy one to see what is inside them. I have used similar things in the past
on boiler Y plans.


--
Adam