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 Interference because of adding modern electronics 
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Firing on two.

Joined: October 12th, 2019, 6:40 pm
Posts: 103
Location: Limburg Belgium
Post Interference because of adding modern electronics
Our classic cars were of straight forward constructions as well as the electrical components. Nowadays many of us add electronic components like LED, gauges, ignition etc to the existing circuitry.
I guess adding high impedence of different origin can cause interference to them, and as a result bad functioning.
Has anyone experienced this and if so is there information on how to overcome ?


June 14th, 2020, 2:17 pm
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Firing on two.
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Joined: March 5th, 2009, 6:23 pm
Posts: 1884
Location: Near Monmouth
Post Re: Interference because of adding modern electronics
I have.
But give a hint as to the issue!


June 14th, 2020, 4:53 pm
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Firing on two.

Joined: October 12th, 2019, 6:40 pm
Posts: 103
Location: Limburg Belgium
Post Re: Interference because of adding modern electronics
Electronic ignition : engine starts but when further opening the throttle, no extra revs, engine starts to sputter and excessive petrol is ignited in the exhaust.
I think that the drivers of the LED 's I used in the headlamps are not protected against the peak currents put on the earth connection by the ignition circuitry.


June 14th, 2020, 8:06 pm
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Joined: March 5th, 2009, 6:23 pm
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Location: Near Monmouth
Post Re: Interference because of adding modern electronics
Disconnect the headlamps and see if the problems exists.

Have got led arrays for all lamps apart from headlights, no issues.

Some of these
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June 14th, 2020, 9:08 pm
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Joined: March 21st, 2013, 12:04 am
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Location: Exeter, Devon
Post Re: Interference because of adding modern electronics
Check all of your grounds. :)

_________________
If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


June 14th, 2020, 9:12 pm
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Joined: March 5th, 2009, 6:23 pm
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Location: Near Monmouth
Post Re: Interference because of adding modern electronics
An idea, do the led drivers create a magnetic field?
That may interfere with the hall sensor in the ignition.

Have a magnetic clutch (from Air con pump) on the engine fan, when first fitted and used car cut out completely, resolved by us using Stainless steel for all fan mounts, now works ok


June 14th, 2020, 9:17 pm
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Firing on two.

Joined: October 12th, 2019, 6:40 pm
Posts: 103
Location: Limburg Belgium
Post Re: Interference because of adding modern electronics
I now have only an estimate of the problem, sometime next week I will open different LED circuits to find out which one causes the interference. The ignition fires the coil on plugs via the minus connection.


June 14th, 2020, 10:22 pm
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Joined: March 5th, 2009, 6:23 pm
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Location: Near Monmouth
Post Re: Interference because of adding modern electronics
Quick google

http://www.ledbenchmark.com/faq/LED-int ... ssues.html

If its RFI, MUMetal case for the drivers, but he RFI may also radiate thru the wiring?


June 15th, 2020, 9:25 am
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Joined: October 12th, 2019, 6:40 pm
Posts: 103
Location: Limburg Belgium
Post Re: Interference because of adding modern electronics
In the 12 V applications its not the interference of a switchmode power supply, but interference through the wiring by the LED driver. Will find out that later this week.


June 15th, 2020, 9:44 am
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Post Re: Interference because of adding modern electronics
Use these https://www.ebay.co.uk/itm/20-Pieces-Cl ... SwnoVa05zo


June 15th, 2020, 10:06 am
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