resolving 60hz hum in DC set-up

jeffry

I had been putting up with this for some time, trying to notch it out, assuming that the reason AC/DC converters are not grounded via 3-prong plug is because they are not subject to the hum AC gear is vulnerable to. But then I ran a wire from the switchplate screw on the receptacle to the chassis of my usb interface and all the noise ceased.

Identor

Direct grounding
I worked as a technician at an open-air festival, where they had an issue with a 50Hz hum in their PA-system on stage.
The problem was the grounding of a large generator. So, we used a very large metal festival-tent peg beside the generator, hammered in the ground, and attached a wire to it to the chassis of the generator, peed on the peg and taddaa! problem solved.

supadom

@Identor said:
Direct grounding
I worked as a technician at an open-air festival, where they had an issue with a 50Hz hum in their PA-system on stage.
The problem was the grounding of a large generator. So, we used a very large metal festival-tent peg beside the generator, hammered in the ground, and attached a wire to it to the chassis of the generator, peed on the peg and taddaa! problem solved.

Haha, love it!

rs2000

POTP. The solution to all hum issues

knewspeak

@Identor said:
Direct grounding
I worked as a technician at an open-air festival, where they had an issue with a 50Hz hum in their PA-system on stage.
The problem was the grounding of a large generator. So, we used a very large metal festival-tent peg beside the generator, hammered in the ground, and attached a wire to it to the chassis of the generator, peed on the peg and taddaa! problem solved.

That’s the way, I vaguely remember reading an electronic equipment manual that had this very solution for users in the USA, except the added urine.