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 Forum index » DIY Hardware and Software » Video synthesis and manipulation
VGA colour signals interrupting VCR?
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der Warst



Joined: Apr 09, 2010
Posts: 9
Location: London

PostPosted: Mon Oct 12, 2015 10:33 pm    Post subject: VGA colour signals interrupting VCR? Reply with quote  Mark this post and the followings unread

Hello there,

I'd like to build a few more fancy things into my videophone.
http://www.warstware.der-warst.de/videoware/videophone

So here's a question: I am looking for a VCR circuit to interrupt the colour channels of the VGA Signal, driven by an oscillator. Ideally, the oscillator goes from an LFO range all the way to HF, so it would fade the colour channels in between 0.7v and GND but could also be used to create horizontal and vertical lines. I've done this with a simple 40106 squarewave osc and 4066 quad switch already and it worked and looked very nice. But especially for the LFO range, I would like to be able to fade the colours in and out with a triangle wave. So instead of a switch, I would need some kind of voltage controlled resistor.
I know that VCRs are a bit of a thing, and if it only was for the LFO range, I probably would use a LED-LDR vactrol, but that obviously is a bit too slow for higher frequencies... Hm, does anyone have any suggestions what I could use? I'm not too concerned with linearity, but I'd rather have a (very) low part count, because the space inside the housing is getting a bit tight now.

So yeah...

Thanks and all,
Simon Warst

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