Reddit mentions of SoulBay 12W Universal Multi Voltage AC/DC Adapter Switching Power Supply with 8 Selectable Adapter Plugs, Suitable for 3 V to 12 V Device

3V converter:
https://www.amazon.com/SMAKN-Converter-Power-Supply-Module/dp/B00ODL140M/ref=sr_1_1?ie=UTF8&qid=1493223709&sr=8-1&keywords=12v+to+3v

AC to DC car converter:
https://www.amazon.com/AOKII-Converter-110-220V-Cigarette-Household/dp/B01H4UZQRA/ref=sr_1_4?s=electronics&ie=UTF8&qid=1493223837&sr=1-4&keywords=ac+to+12v+dc+power+adapter

and 12V plug + wires:
https://www.amazon.com/uxcell-Button-Cigarette-Lighter-Black/dp/B0090149R0/ref=sr_1_4?s=automotive&ie=UTF8&qid=1493223892&sr=1-4&keywords=12v+plug

of course you can combine all 3 into one with something like this but that's what I had around the house
https://www.amazon.com/SoulBay-Universal-Switching-Selectable-Suitable/dp/B01ISM267G/ref=sr_1_3?ie=UTF8&qid=1493223964&sr=8-3&keywords=ac+to+3v+dc

It's just a 9V barrel plug thingy, almost every universal AC/DC adapter will work. just something like this

Thank you for all that! That was a useful YouTube video, too.

I had to make the purchases yesterday, since I'll be playing with actors in the studio on Monday. That said, I still have time to buy some things.

It's a comfort that I seem to be on the right track. The biggest difference between what I bought and your suggestions is that you suggested I buy the Dock-Kings and other pricier receiver/converting gear. I'd appreciate if you could look at my list of purchased items to determine if you think it will work, or if you see some some red flags.

I suppose in the long run, if this theatre show concept shows promise, we would then invest in more reliable gear, such as no-compression wireless HDMI tx/rx. For now, here it is:

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4 cameras:

https://www.amazon.com/gp/product/B06Y5D8SPZ/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 (1S LiPo)

2 x https://www.amazon.com/gp/product/B06Y56RL5P/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 (1S LiPo)

https://www.amazon.com/gp/product/B0184DVN4G/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 (2S or 3S LiPo)

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3 receivers (should I buy different antennae?):

https://www.amazon.com/gp/product/B0774SMGQN/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1

2 x https://www.amazon.com/gp/product/B01H36AIGY/ref=ppx_yo_dt_b_asin_title_o03_s02?ie=UTF8&psc=1

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3 AC/DC adapters for the receivers:

3 x https://www.amazon.com/gp/product/B01ISM267G/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

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3S LiPo (for 3S LiPo camera and try battery-powered Receiver)

2 x https://www.amazon.com/gp/product/B07GF63645/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

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Battery chargers

https://www.amazon.com/gp/product/B00466PKE0/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

https://www.amazon.com/Battery-Charger-Channel-Inductrix-Connectors/dp/B074M6G2MD

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Each receiver has an AV output + AV RCA cable. I'll plug in the RCAs from 2 or 3 receivers into this Switcher:

https://www.amazon.com/gp/product/B00KXVBB7C/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

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Using an RCA cable, connect the Switcher's Output to this RCA to HDMI converter:

https://www.amazon.com/gp/product/B07KTDG177/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

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Then HDMI to projector.

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Ta-da?

Back in the day, you could go to RadioShack and they would have adaptors and the would come with 1 too and you could try all the tips to find the right size. I don’t know what would approximate that today but you definitely would need a 12v + polarity adaptor and a barrel plug that will fit that. Also, there is a very slim chance that battery will still work. They were never great back then and with 20+ years I can’t imagine it working for more than a few mins.

Edit: maybe this one? SoulBay 12W Universal Multi Voltage AC/DC Adapter Switching Power Supply with 6 Selectable Adapter Plugs, Suitable for 3 V to 12 V Device https://www.amazon.com/dp/B01ISM267G/ref=cm_sw_r_cp_api_i_beGnDb4NTG8ZZ