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Old 14th Dec 2020, 12:15 am   #4
KeithsTV's Avatar
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,431
Default Re: Homemade Teletext decoder (based on Mullard Module)

There's a circuit for a teletext decoder using the Mullard ICs in the September 1980 Practical Electronics.

I bought a surplus Mullard decoder in 1981 and using that circuit as a reference got it going. I also had the datasheets for the four ICs which allowed me to build a circuit to generate the control signals for it. I later wrote a program for my Acorn Atom to control it. It worked very well using a video output from my Thorn 1590 chassis TV and feeding the video output from the decoder into a monochrome monitor.

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