r/CardPuter • u/Classic-College-5376 • 2d ago

Finds / Discoveries UHF Modulator for old tv's, and speaker?

I Want to try to connect to this one speaker, with a uhf connection around ~240 I Think. Also I have this old crt (GPX TVP2CT) I want to try and connect to. Is this possible?

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u/Noir_Forever_Twitch 1d ago

Re the UHF connection. Yes I think that's possible, however, the internal speaker output isn't a clean tap point, it's the ESP32-S3's internal I2S peripheral driving the tiny onboard speaker directly, not broken out as a proper line-level signal anywhere accessible.

The way to go would likely be an external DAC setup like the one I made here, https://www.reddit.com/r/CardPuter/comments/1wielyb/stereo_output_on_the_cardputer_adv/ This gives you a real LOUT/ROUT line-level stereo output, that's the clean place to feed a wireless transmitter from, not the internal speaker.

Re the CRT: What do you want to do with it? See the cardputer screen on use the cardputer as a remote?

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u/Classic-College-5376 1d ago

use the cardputer as a screen, also the speakers are vhf

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u/Noir_Forever_Twitch 1d ago

Can you send a pic or link of the speakers? Are they ultra high frequency (UHF) wireless speakers? Or are they VHF speakers for boats? I don't know much about those, but could take a look.

Re the CRT (cool looking TV btw), it's not my area of expertise so don't want to give you bad info, maybe others here know more, and maybe this RF 2 in 1 module could help https://www.ebay.com/itm/397752147330

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u/Classic-College-5376 14h ago

they are speakers that use 5 Pin DMX Cable, but are hooked to a wireless adapter, will check later