Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!mimsy!umd5!hans From: hans@umd5.umd.edu (Hans Breitenlohner) Newsgroups: sci.electronics Subject: Re: TTL Questions Message-ID: <1795@umd5.umd.edu> Date: Fri, 17-Jul-87 14:22:04 EDT Article-I.D.: umd5.1795 Posted: Fri Jul 17 14:22:04 1987 Date-Received: Sat, 18-Jul-87 16:57:47 EDT References: <1395@crash.CTS.COM> Reply-To: hans@umd5.umd.edu (Hans Breitenlohner) Organization: University of Maryland, College Park Lines: 12 In article <1395@crash.CTS.COM> rpluth@pnet01.CTS.COM (Ron Pluth) writes: > > 1. What's the easiest way to go about interfacing a TTL >output (from, say, a standard S or LS AND gate) to a relay, for >controlling anything from automobile (12VDC) to house (120VAC) > ... One effective way to convert from logic levels (including LS and CMOS) to power levels appropriate for driving relays is to use VMOS transistors. Like CMOS logic they do not require any extraneous drive current in either the 'on' or the 'off' state. Radio Shack used to carry some, I have not checked recently.