How do I choose Mirror size?

[Doc]

You would need to check the manual for the galvos that you choose, then hunt down a supply that fits the bill (and the case).

[mixedgas]

Also with better galvos figure on larger gauge wiring, adding some cheap protection in the form of extra filter caps, and a few blocking diodes in case a power supply goes nuclear.
You want short, direct, leads from each galvo amp to the caps and the power supplies, making sure not to share the "power return" ground leads with your input signal ground.

With a good FAST galvo, 4-5 amps peak flows in the ground leads, and this can cause "lifting" which shows up in the image if you do not wire grounds and feeds correctly. which is easy.
I'm amazed at the poor wiring that comes with some "Import" galvos.

Steve

[Bradfo69]

@Steve - When you clip off a toenail and toss it in the trash, there is more electronics knowledge in that scrap of dead cells than I'll ever hope to know or retain but, since I bought two sets of the EMS7000's, I'm curious for a laymans description of filter caps and blocking diodes and how they work or get integrated into the whole scheme of things.

I'm really hoping to swap a set out in one of my projectors in place of DT40's without having to pay the PL member manufacturer to do it and, I understand that they require a new (quality) power supply that some people have had difficulty in tracking down. Although I've never done it, I would like to think I was competent enough to change out a power supply and the galvo amps and scanner block. Now you have me worried. I understand using "larger gauge wiring". I understand keeping the wires as short as possible but, don't know what you're talking about with respect to adding in "filter caps & blocking diodes" etc.

I need to study the existing wiring too and, see if I can figure out what you mean about not sharing grounds as I've always heard about using a star grounding method in a projector to connect everything together. Maybe once I study this projector this will make sense but, as I read your comments, it's not registering.

Thanks!