Re: Help me solve this design problem PLEEEZ

On Thu, 31 Mar 2005 16:21:31 -0800, mike <spamme0@xxxxxxxxxxxx> wrote:

>OK, let's put on our thinking caps.
>Why would anybody want to limit the duty cycle???
>
>If it's heat, put a thermistor on the magnet.
>When it gets too hot, turn on the "coffee break" sign.
>
>If you can't get at the magnet, make a heater/heatsink/thermistor
>with the same time constant. I'd suggest a snap-action thermal switch,
>but make sure it's rated for lots of operations. The little round
>jobbers probably aren't.
>
>Never infer a condition when you can (easily) measure it.
>mike

---
"make a heater/heatsink/thermistor with the same time constant"? Good
luck... Another self-styled expert raises his ugly head and proposes
a half-baked solution with no backup.

Dumbass, the manufacturer of the magnet specifies a 50% duty cycle and
the maximum ON time VS ambient temp, so it should be obvious that if
you keep track of how long it's been on you can figure out when you
have to shut it down, and for how long, without having to build a
physical model to compare it against.

So, take your "hey it's so obvious" thinking cap *** and stick it
back up your ass where it belongs.

--
John Fields
Professional Circuit Designer
.

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