Subject:
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Re: Pneumatic Solenoid Valve Interest Poll
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 4 Feb 2000 14:07:41 GMT
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Original-From:
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SIMON_JENSEN-FELLOWS@AVID.COMnomorespam
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Viewed:
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1946 times
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The better model railway ('railroad') point ('turnout' or 'switch') controllers
use
a largish capacitor to drive their solenoids. This has several benefits: it
provides a
high voltage/current to drive the solenoid and it isolates the solenoids
operation from
any other devices powered from the same supply - your engines don't slow down
when a point
motor operates. Essentially, it's an easy way of getting a high current 12V
pulse.
Perhaps there's an illustration somewhere online, but the circuit is pretty
simple:
trickle power to the capacitor through a resistor and diode, use a relay - or
solid state
device if size is an issue - to switch the output to the solenoid.
-Simon
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Message has 1 Reply:
 | | Re: Pneumatic Solenoid Valve Interest Poll
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| (...) A variation on the capacitor idea is to put a large non-polarized capacitor in series with the solenoid. Put a diode in parallel with the capacitor. Apply reverse output to charge up the capacitor, then apply forward output. This will (...) (25 years ago, 4-Feb-00, to lugnet.robotics)
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