hamilton@vax1.acs.udel.EDU (Andrew W Hamilton) (02/13/90)
I'm trying to build a circuit which outputs a continuous square wave where the period can be varied from about 4 seconds to 60 seconds using a variable resistor. The catch is that no matter what the period is, the "high" must be a contstant 3 seconds, i.e, a period of 10 seconds would have a 7 second low and a 3 second high. I tried using a 555, but I'm not too familiar with them, and I can only set the ratio of high time to low time, rather than a specific high time for any period. The circuit should run at about 10-12 volts. Any ideas? Thanks in advance, Andrew. ------------------------------------------- Andrew W Hamilton hamilton@vax1.acs.udel.edu hamilton@freezer.it.udel.edu
dnewton@carroll1.cc.edu (Dave Newton the Late) (02/13/90)
In article <5712@udccvax1.acs.udel.EDU: hamilton@vax1.acs.udel.EDU (Andrew W Hamilton) writes:
:I'm trying to build a circuit which outputs a continuous square wave
:where the period can be varied from about 4 seconds to 60 seconds using
:a variable resistor. The catch is that no matter what the period is,
:the "high" must be a contstant 3 seconds, i.e, a period of 10 seconds
:would have a 7 second low and a 3 second high.
I'm rusty, but I think what you want is a one-shot...
--
David L. Newton | uunet!marque!carroll1!dnewton
(414) 524-7343 (work) | dnewton@carroll1.cc.edu
(414) 524-6809 (home) | 100 NE Ave, Waukesha WI 53186