LesCir Posted November 25, 2012 Report Share Posted November 25, 2012 I need some help building a simple circuit (logic wise it's simple, that is). I can build it with three mechanical relays, but I'd prefer to do it with solid-state components. Unfortunately my electronics knowledge doesn't extend much beyond a basic understanding of simple components. Here what it needs to do:I have two switches, switch 1 & switch 2, which send 12 volts to two different automotive components. The switches are "latching", not momentary. When switch 1 is turned on I want to light LED 1. When switch 2 is on, I want to light LED 2 (I know how to do that part of the system). However, when BOTH switches are on, I want to detect the "AND" condition and light a third LED 3 while shutting off LED's 1 & 2. If switch 1 or 2 is shut off, it should fall back to lighting the proper LED 1 or 2 and drop power to LED 3. I don't need any serious power through the circuit, the main switches take care of that, I just need to light the LED's. Are there some logical components I can use to do this (and I need hand holding... my skills are more limited than you think :-) Thanks, Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 26, 2012 Report Share Posted November 26, 2012 It can be done using combinational logic, composed of logic ICs or a programable device such as a microcontroller. In this case discrete ICs (CD4000 or 74HC series) or even transistors will do.Here are a couple of links to some tutorials:http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.htmlhttp://www.opamp-electronics.com/tutorials/digital_theory_ch_003.htm Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.