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1. Electronics help - Sp3500 project (score: 1): Author: "Michael D. Nugent, Ph.D." <nugentmd@gte.net>; Date: Tue, 24 Oct 2000 09:25:14 -0700; I need help figuring out what parts I need to do this: - initially pass current (12v, <20amps) - stop the flow of current after 5-10 seconds - preferably not flow again until power is turned off and; /html/spitfires/2000-10/msg00547.html (7,314 bytes)
2. Re: Electronics help - Sp3500 project (score: 1): Author: Dave Chu <dave@ece.concordia.ca>; Date: Tue, 24 Oct 2000 17:09:19 -0400; You will need a couple of transistors, 12V relay, and a 555 timer. The timer should be configured as a monostable or one shot timer. The first transistor will act as a trigger for the timer and the t; /html/spitfires/2000-10/msg00551.html (8,477 bytes)
3. Re: Electronics help - Sp3500 project (score: 1): Author: "Paul Cartwright" <pcart@willinet.net>; Date: Thu, 26 Oct 2000 22:29:34 -0700; I believe I have a solution that would be easier to implement. It involves using a 12v normally closed (NC) relay and a 12v normally open, time delay relay (NOTD). The coils on both relays are powere; /html/spitfires/2000-10/msg00650.html (8,189 bytes)
4. Re: Electronics help - Sp3500 project (score: 1): Author: "Paul Cartwright" <pcart@willinet.net>; Date: Thu, 26 Oct 2000 23:19:55 -0700; I have made an error in terminology in my previous post. I believe that "normal" state is without the coil being energized. Therefore the relays that are needed are a 12v normally open (NO) and a 12v; /html/spitfires/2000-10/msg00653.html (9,272 bytes)

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