PIC-Based Video Cleaner
Approx construction cost US$64
It transpired that the problem was caused by something called "Macrovision", which is a VCR-to-VCR copy-prevention system. This purposely introduces interference pulses on the video tape. Generally speaking these interference pulses don't cause any problems, but in some cases they can interfere with the picture quality.
This PIC-based project is designed to remove the interference pulses (and to replace them with an appropriate DC level, since the TV or VCR requires a reference voltage to set its brightness).
More details on this construction project can be found in the February 2000 issue of EPE Online, the world's first web-delivered electronics and computing hobbyist magazine.
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