[TowerTalk] Brake delay adjustment

[Tom Rauch]

> 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

--
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com