Mystery amp schematic





 





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On the Dangers of Buying New ZX Spectrum Membranes

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I have recently purchased a new membrane for my ZX Spectrum +48k. It was bought from one of two(?) of the big manufacturers of these modern membranes. According to the seller, they have been making them for over 20 years, and have never made a bad one. However, once installed in my Spectrum +48k, the following keys did not respond unless pressed with significantly more force than was necessary to activate the others: True video Inv video Break Delete Graph Extend mode Edit Caps lock Full stop Semicolon Inverted comma Left arrow Right arrow Up arrow Down arrow Comma Video demonstrating unresponsive keys If my understanding is correct, activation of these these keys requires the third layer of the membrane to make contact with the other two. I messaged the seller about this, and he was fairly certain that the fault was due to improper installation on my part. He helpfully sent me a list of instructions. However, after reinstalling the membrane, following his advice to t...
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