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From: Fred Bloggs
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Subject: Re: How to get CMOS counter to drive a relay?
References: <0001HW.B9CEF278023A90B81662EAD0@news.covad.net> <3DA9D6CC.email@example.com> <3DA9D9E1.firstname.lastname@example.org> <3DA9EE2A.B7CFD919@juno.com> <3DAAF96D.email@example.com> <firstname.lastname@example.org> <3DAC2583.email@example.com> <firstname.lastname@example.org> <3DAD689F.email@example.com> <3DADBB67.4917CD48@bellatlantic.net> <%Cpr9.64373$XF.firstname.lastname@example.org>
Date: Fri, 18 Oct 2002 11:41:54 GMT
NNTP-Posting-Date: Fri, 18 Oct 2002 04:41:54 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
> Just look at what the pinball people did. Lots of coils. Early on
> they used transistor pairs to drive these. Some of the latter ones evolved
> to simple MOSFETs and the reliability increased tremendously.
Just exactly how were the transistor pairs configured to drive the
"coils"? Was there something else that accompanied the transition to
MOSFET drive like direct microprocessor I/O control? The pinball machine
"coils" should be mostly solenoids, right? I can see where conversion to
microprocessor supervision would enable economical
pulse-width-modulation of the coil voltage, and this would definitely
make for a big improvement in solenoid lifetime because the heat
dissipation could be nearly halved.
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