The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Fred Bloggs
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
X-Accept-Language: en-us, en
Subject: Re: How to get CMOS counter to drive a relay?
References: <0001HW.B9CEF278023A90B81662EAD0@news.covad.net> <3DA9D6CC.firstname.lastname@example.org> <3DA9D9E1.email@example.com> <3DA9EE2A.B7CFD919@juno.com> <3DAAF96D.firstname.lastname@example.org> <email@example.com> <3DAC2583.firstname.lastname@example.org> <email@example.com> <3DAD689F.firstname.lastname@example.org> <3DADBB67.4917CD48@bellatlantic.net> <%Cpr9.64373$XF.email@example.com>
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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup