[TowerTalk] Brake delay adjustment

[alsopb]

You add a 10 ohm 1/2 watt resistor in series with the relay coil.
Note: The break delay circuit offered by some does not include it.  I
do.  I suspect the microswitches (they look pretty macro by today's
standards) can handle it.

73 de Brian/K3KO

Tom Rauch wrote:
> 
> > It's essentially two diodes, a relay and a capacitor. Adding an
> > indicator
> > costs your one more diode, a resistor and an LED.  The RC time
> > constant for
> > delay is determined by the resistance of the relay coil and the
> > capacitor.
> >
> > Given the relay, you can increase the delay to be anything
> > you want by simply changing the value of the capacitor.  Just parallel the
> > existing cap with an Radio Shack 50v electrolytic. For example, if the
> > existing delay is 4 seconds and the existing cap is 10,000 ufd and you
> > want 6 seconds, add another 4700ufd.  Pay attention to the
> polarity.
> 
> How do you keep the high charging current from damaging the
> switch? Do you add enough series charging resistance, or does
> the supply have enough ESR?
> 
> 73, Tom W8JI
> w8ji@contesting.com

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