LED landing lights cause radio noise(only with engine running)

Re: LED landing lights cause radio noise(only with engine running)

by james porter » 8 years ago

james porter

14 81 73

They are said to be 21 W and draw 1.2 A at 12 volts. Not much else is stated. Each has 6 led's and when operating they draw about 2 amps. The led's are mounted on a circuit board and enclosed in in an aluminum case with heat sink for cooling. From what I have read the power supply driver is probably not the ballast resistors.

Re: LED landing lights cause radio noise(only with engine running)

by Bill Hertzel » 8 years ago

Bill Hertzel

13 1.95k 8k

The LED Driver is likely having an argument with the Voltage Regulator on the alternator. Every time the LED Driver decides on a current, the Regulator adjusts the voltage, which changes the current, and back and forth it goes a thousand times a second.

A Capacitor on the LED Supply line Near the Lights should act like a sedative and calm down all the nervous reactions.

---

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Re: LED landing lights cause radio noise(only with engine running)

by james porter » 8 years ago

james porter

14 81 73

Thank you. This explains why the squelch is generated when the alternator comes online.
I theorized that limiting the input voltage might help so I ordered two step down adjustable voltage regulators/limiters.
I like your fix better. The capacitors are available locally and on Sunday.

Re: LED landing lights cause radio noise(only with engine running)

by Jacques Foucher » 8 years ago

Jacques Foucher

19 109 248

I have the sameProblem : my solution :
a filter which self , condensators and ferrites

Filter.png (You do not have access to download this file.)

Self.jpg (You do not have access to download this file.)

100nF.jpg (You do not have access to download this file.)

Ferrite.jpg (You do not have access to download this file.)

Re: LED landing lights cause radio noise(only with engine running)

by Jacques Foucher » 8 years ago

Jacques Foucher

19 109 248

Components ref from Radiospares