RE: [DML] Re: RPM Relay

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

FYI, electronics people call this a "retriggerable monostable" or 
"retriggerable one-shot".  Not that that's terribly important. (Because it 
isn't!)  It's just a bit of electronics trivia for anyone who's interested.

-Joe Kuchan

>From: "ksgrimsr" <knut.s.grimsrud@xxxxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: [DML] Re: RPM Relay
>Date: Mon, 18 Jul 2005 14:57:46 -0000
>
>The RPM relay is a pretty simple circuit based on a 555 timer chip.
>The basic logic of the circuit is that a received pulse from the tach
>causes the 555 timer chip to activate for it's timeout period (a
>couple seconds). As long as it receives another tach pulse before its
>timeout elapses, the timeout resets and the circuit stays active. The
>net effect is that the relay activates on the first received tach
>pulse and then deactivates a couple seconds after the last received
>pulse.
>




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