Alt-BEAM Archive
Message #05107
To: alt-beam@egroups.com
From: "Jesse Merritt" jmerritt@petsafe.net
Date: Thu, 8 Jul 1999 09:28:32 -0400
Subject: [alt-beam] Re: Raising the turn off v of a 1381 SE
Here's an idea (I have no programs that can save a schematic as a gif or
jpg)
Put another 3904 between the output of the 1381 and the base of the latching
3904. Attach the base of the new 3904 to another separate 1381 that is set
for the voltage you want the latch to release. Run the input of the new
1381 to the power rail.
Here's how it would work in theory. As the cap charges the voltage reaches
the trigger voltage of the new 1381, turning on the new transistor. The
voltage on the cap continues to rise, turning on the original 1381. This
turns on the original 3904 through the new transistor. It then allows the
motor to turn and turns on the motor. Then voltage begins to drop from the
cap and turns off the original 1381. the latch stays on until the lower
threshold is reached on the new 1381 which turns it off. The new 3904 is
then turned off, stopping current flow in the latch which turns it off.
Just theory haven't built it yet. What'cha think?
Jes
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