piclist 2001\01\29\105721a >
Thread: 2.5KW Load
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face BY : mike@spam@@whitewing.co.uk



On Mon, 29 Jan 2001 23:57:25 +1100, you wrote:

>I do it in battery powered devices with a large capacitor
>and resistor. The cap is BEFORE the relay's switching semi,
>and connected to V+ by the resistor. On first turn on the
>full voltage comes from the cap to pull-in the relay, and
>as soon as the cap discharges the resistor provides enough
>holding current. I normally aim for about 35% holding
>current. Never had a problem with it. (also decouples
>the supply from the relay back emf quite well) :o)
>-Roman
One thing to be aware of with doing this - if the product may be
subject to mechanical shock (e.g. a handheld unit that can be dropped
onto the bench) , this can cause the relay to drop out, and the low
holding current will not be enough to pull it back in.
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