Electronics > Projects, Designs, and Technical Stuff

I think I need a little help. AC IN switch circuit.

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mkiijam:

--- Quote from: NiHaoMike on April 17, 2024, 03:46:45 am ---One trick is to have the switching supply powered across the relay contacts, so that it turns off once the relay is turned on. Use a diode from a switched rail to keep the relay on.

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This sounds interesting and I'm trying to visualize it

tooki:

--- Quote from: mkiijam on April 16, 2024, 06:06:45 pm ---
--- Quote from: madires on April 16, 2024, 05:43:45 pm ---I don't know how sensitive the circuit is that you're concerned about running wires for mains AC to the front panel. Would the 5V SMPSU also create a problem for the circuit (long wires to the front panel)? Regarding the relay switching an inductive load it would be a good idea put something like a snubber on the load side.

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Pretty sensitive. The 5V will not be an issue.

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If it’s that sensitive, I’d imagine having a SMPS anywhere nearby to be FAR, far worse than mains wires. The 5V isn’t the issue. It’s the multi-kHz noise superimposed on it, as well as radiated out from the SMPS itself.

Surely you can just route the mains wire to the front panel far enough away? (I mean, that’s how countless pieces of audio gear do it.) You could also shield the mains wiring if necessary.

Not to mention that if your circuit is that sensitive, maybe you should shield it itself, since it may encounter other sources of noise when out in the field.

mkiijam:
Here is a picture that may help in understanding my dilemma. The main PCB covers the entire area inside the box and I really don't want AC running around or over the other circuits.

MarkF:

--- Quote from: mkiijam on April 18, 2024, 01:18:46 pm ---Here is a picture that may help in understanding my dilemma. The main PCB covers the entire area inside the box and I really don't want AC running around or over the other circuits.

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That's why they make these:



Route your wires along the frame away from sensitive components and tie them in place with self-stick mounting pads.

mkiijam:
The entire area is covered by PCB with components on it. There is area around the "sides" of the PCB up to the front panel, but not along the back. The IEC inlet is in the center with AUDIO IO's on either side.

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