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Post by Kevmeister on Oct 17, 2019 15:25:33 GMT
Hi,
I've just recently purchased a Q20 to replace my Q2.
I'm having hum issue with my Q20.
I've checked the capacitors on the power supply inside the Q20, also checked that the ground lug was secure, and they are fine.
Also tried different IEC cables.
Anyone else have hum issue with their Q20?
If so how did you fix it?
Here is a video showing the fault.
Regards
Kev
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Post by bazmusicman on Oct 17, 2019 15:40:42 GMT
It sounds like you have a ground loop problem.
Charlie used to supply an additional short cable which was wired to overcome this problem. Maybe if he sees this post he may chip in.
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Post by Charlie Hall on Oct 17, 2019 19:20:10 GMT
It is a ground or earth loop problem. The solution is to connect the ground or earth of the cable to the ring terminal of a stereo jack plug. Nothing connected to the earth terminal of the plug.
Regards,
Charlie
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Post by Kevmeister on Oct 19, 2019 14:12:04 GMT
Hi Charlie,
Thanks for replying.
So do you mean lift the earth off my mains plug?
Regards
Kev
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Post by rogercook on Oct 19, 2019 15:50:24 GMT
No!!! That would be dangerous. Use a stereo (aka TRS) jack at the Q20 output. Wire the tip to the inner conductor and the ring to the cable screen. Don't connect the cable to the shield on the plug. TRS plug diagrams here: www.circuitbasics.com/how-to-hack-a-headphone-jack/ |
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Post by Charlie Hall on Oct 19, 2019 17:39:50 GMT
Hi Charlie, Thanks for replying. So do you mean lift the earth off my mains plug? Regards Kev No, as Roger says and what I also meant, wire the Q20 output as instructed. Regards, Charlie |
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