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Old 27th Mar 2021, 2:45 pm   #3
Graham G3ZVT
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Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
Default Re: Modulator for 405 Line from PC?

I use an ATI Radeon HD 2400 XT graphics card (about £10 on Ebay) and this modulator
http://www.earlytelevision.org/405_modulator.html

Hopefully that will look less intimidating as a project, and you could tackle the sound and vision parts separately if you want.

No expensive crystals to buy and no frequency synthesis, just a pair of free running oscillators, but it is quite stable enough, picture and sound are excellent.

I didn't bother with a custom PCB I just used perforated project board.
The chips are still available from Littlediode.
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Last edited by Graham G3ZVT; 27th Mar 2021 at 3:00 pm.
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