🇹🇼 Princess PBW-121 (Adding Video Input to RF-only TV): Part 2 [TCE #0523]
36This is my Princess PBW-121 television that my parents gave me for Xmas one year in the mid-80s. It has a 4.5" B&W CRT, built-in antenna and a 3.5mm mono socket for an external 300Ω antenna. However no video/composite input.
It utilises an AN5151N signal processor that does most of the processing of an RF television signal, producing a separated audio & video signal. This allows us to more easily inject a baseband video signal.
I made a very simple modification to add composite video & audio in ... disconnected pin 5 (video output) and pin 11 (audio output) from the AN5151N and fed these in directly from an external source.
I removed the PCB-mounted 3.5mm MONO socket for the external antenna and replaced it with a panel-mounted 3.5mm STEREO socket that accepts video, mono audio and ground.
There are still quite visible horizontal retrace lines ... even when no A/V source is connected ... I wonder if powering the AN515N chip down (removing Vcc1 & Vcc2) might affect this?
Although ... going back through the comments on my Part 1 video, there's some very good advice that I need to follow up on:
• 🇹🇼 Princess PBW-121 (Adding Video Inp...
My Patreon posts about this:
[1] https://www.patreon.com/posts/princess-pbw-121-112806650[2] https://www.patreon.com/posts/princess-pbw-121-112992024
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