Reply to "Remote Control Audio for Rolling Stock"

stan2004OGR Forum Member

I added a 78L05 right at what you call J1 to power the RF receiver separately. Let's just say the results were dramatic.

The 22uH did NOT work in my situation but we do have a slightly different configuration. In my case I was looking at the noise on the 5V supply to the receiver on the scope; it's low-freq audio noise from the current variations that I believe is messing up the receiver sensitivity. The 22uH does not have enough of a low-freq effect.

This is one of those cases where I hope Your Mileage does NOT vary!

BTW, not today's problem, but are you really using 10 or 12 mil traces on your power supply lines on the PCB. Given the average current when pumping out a couple watts of audio, I'm thinking 25 mil minimum and the more the merrier...you have the room.

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