Sanyo DS25530 - Modding Help

[Alex KL-1]

The isolation transformer permits to ground the AV inputs safely to the TV signal ground, but like vol.2 mentioned, this have a cost. Perhaps all the parts for complete the optoisolator section can be cheaper, then.

If the LA7673 have the delay line issues with direct AV, you can insert a 10k pot in the AV select pin (43) for matching the luma with chroma (using the Vcc suply of the IC, and other side of the pot to ground; the center wiper goes to the select pin). If it follow i'ts cousin logic, one correct voltage level will enable the correct needed function. Just in case of image mismatching when trying that.

[jhalphen]

Hi to all,

Thanks! to Vol.2 for the LA7673 pinout.

Isolation transformer: anyone who works with modern electronics needs one.
All modern gear use SMPS (Switch Mode Power Supplies) which equates with HOT chassis.
Iso-Tx's are often found for cheap at vintage radio/Ham swap meets or contact a local radio club, often old-timers give away items as they thin out/dispose of collections.
Radio clubs & shows calendar:
https://antiqueradios.com/forums/viewforum.php?f=24

Video in mod: i would stick with Composite Video. Component or RGB is a whole other ball game.

Opto-isolator: i suggest you build this design, it works and has very good video bandwidth, 17MHz at -3dB.
Full details including PCB layout here :

https://antiqueradios.com/forums/vie...lator#p3685058

Best Regards
jhalphen
Paris/France

[2Beeried]

Awesome, thank you everyone, gives me an idea of where to start and what to look for, and I completely missed vol. 2's post while writing my previous post, hugely helpful and answered questions.

So seems to be I have a parts list I can start building out at the minimum.

And yes, I apologize for the confusion, composite in is what I am looking for, not component. I am putting together a GBS-C while researching this, both terms are in the same "project" folder in my head right now.