Do I need to consider something special for circuit i put on car?

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JoniS
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Posted by JoniS: Mon. Oct 9, 2017 - 02:37 AM
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Hi!

As title says is there some special design considerations for electronics installed in car?

 

I need something to turn on the amplifiers with little delay since my line converter is acting wonky and outputting startup signal ie. When door is opened and the amplifiers briefly try to start because of this, which is not wanted, manufactor of the line converter washes his hands by saying "it's so new car that it might give all kind of signals"...(great).

 

So I was thinking, adding atmel to highjack the signal from line converter and turn on the amplifiers via relay or something when the signal have been active for X amount of time, thus eliminating the false signals.

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Learning and Information, General Electronics
Last Edited: Mon. Oct 9, 2017 - 02:38 AM
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Bronze Markjs
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Posted by js: Mon. Oct 9, 2017 - 06:23 AM
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You will need power supplies and circuits that can withstand load dump (Google is your friend) and other electrical noises.

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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MarekJ71
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Posted by MarekJ71: Mon. Oct 9, 2017 - 07:53 AM
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Your device should work correctly in wide temperature range, from winter night temperature to temperature in a car staying entire day in summer sun. I took a look at datasheets of a few Atmel microcontrollers and temperature range for all of them is OK, but of course every component of your device should have appropriate working temperature range.

Last Edited: Mon. Oct 9, 2017 - 07:54 AM
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DO1THL
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Posted by DO1THL: Mon. Oct 9, 2017 - 08:59 AM
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And of course you should check with your car assurance how high the premium will rise since you modified a car's electrical system and the car therefore no longer conforms to the specs when it was series tested before. Surely you and all of us know that you don't ever create any erratic hard- and software. But how can they know?

Einstein was right: "Two things are unlimited: the universe and the human stupidity. But i'm not quite sure about the former..."

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valusoft
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Posted by valusoft: Mon. Oct 9, 2017 - 11:42 AM
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DO1THL wrote:

 But how can they know?

... especially if you plug it into the cigarette lighter socket.

 

Ross McKenzie, Melbourne Australia

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ki0bk
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Posted by ki0bk: Mon. Oct 9, 2017 - 12:40 PM
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Why not just use a "time delay relay"   https://www.allaboutcircuits.com...

 

these have been around a long time to solve just this type of problem.

 

Jim

 

 

Keys to wealth:

Invest for cash flow, not capital gains!

Wealth is attracted, not chased! 

Income is proportional to how many you serve!

 

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JoniS
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Posted by JoniS: Mon. Oct 9, 2017 - 02:27 PM
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ki0bk wrote:

Why not just use a "time delay relay"   https://www.allaboutcircuits.com/textbook/digital/chpt-5/time-delay-relays/

 

these have been around a long time to solve just this type of problem.

 

Jim

 

Cool, I had no idea such thing exists :P this might be just what I'm looking for I just did not know it yet.

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