swicthing earth or live
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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hcmini1989
- MegaSquirt Newbie
- Posts: 4
- Joined: Fri Aug 07, 2009 1:01 pm
swicthing earth or live
can i just ask does anyone know why we switch earths and live`s is it to do with the component we are wiring up or does`nt it matter .ive tried to find why things are wired with switched earths and the same with switched lives but cant seem to find out why ? it is done thanks for any help
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LeslieTroyer
- Helpful Squirter
- Posts: 35
- Joined: Tue Nov 20, 2007 11:46 am
Re: swicthing earth or live
it is easier for electronic circuits to sink power than it is for them to source power.....
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hcmini1989
- MegaSquirt Newbie
- Posts: 4
- Joined: Fri Aug 07, 2009 1:01 pm
Re: swicthing earth or live
huh i think i understand so switched earth is better then for low power systems
Re: swicthing earth or live
In terms of the MS it's because an NPN transistor is doing the switching and common emitter mode is the best for this job. In this configuration the load is between the positive supply and the collector.hcmini1989 wrote:can i just ask does anyone know why we switch earths and live`s is it to do with the component we are wiring up or does`nt it matter .ive tried to find why things are wired with switched earths and the same with switched lives but cant seem to find out why ? it is done thanks for any help
If you Google on common emitter, common base and common collector you'll get the pros and cons of each type.
Dave P, London UK.
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