Electronics > Beginners

Is this a ground loop ?

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Brumby:

--- Quote from: lordvader88 on July 28, 2018, 05:25:33 pm ---No it's as simple as I've stated. The wire is 3" long and 1" from the transformer on the right. The TDA2003 is about 1" from the trans. on the left side.

The entire negative rail is completely 1 piece of copper on the PCB. This is a super cheap/simple 10W practice amp. The PCB is the size of a TV remote control

--- End quote ---

A worded description is not nearly good enough for us to know what's going on.  If you aren't comfortable putting together a schematic, then a couple of clear, well lit and in focus photographs are better than what you've offered so far.  Also, expect questions arising from the photos.

Our concern is safety - and that is why we are being very particular.


--- Quote from: tggzzz on July 28, 2018, 03:42:17 pm ---
--- Quote from: Brumby on July 28, 2018, 07:38:44 am ---Just disconnecting an earth wire makes me (and I am sure many others here) very nervous - and until we can be certain of the risk - please treat your Amp as if the chassis and circuitry were mains live.

If you think I'm being over the top about this - I'm not.  People have DIED because an earth lead had been cut.

--- End quote ---

Yes. You didn't use enough emphasis.

--- End quote ---

You are right - but this member has been around for a while and has asked a number of questions, so I didn't think they would appreciate being howled at straight up.


lordvader88 - please understand we want to be sure on any comments we offer when it comes to earth connections - based on others' mistakes and our experiences with hum and ground loops.

We can't look over your shoulder and warn you of a potentially fatal action on your part - which is why we are being so particular.  Please do not dismiss this.

tggzzz:

--- Quote from: Brumby on July 29, 2018, 02:40:33 pm ---You are right - but this member has been around for a while and has asked a number of questions, so I didn't think they would appreciate being howled at straight up.

--- End quote ---

All good points.

On reflection I think my initial post was a little abrupt, probably based on inferring too much from his moniker. I suspect the "88" implies he is too young to remember the 60s/70s!

Brumby:
I don't think your initial post was too bad.  It came across as a strong reinforcement of my warning - which, in the case of a potential safety issue (as this is), is not inappropriate.

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