Sinclair ZX80 / ZX81 / Z88 Forums

Ok a quick update. I did a lot of tweaking, also due to my Daewoo monitor that definitely has some problem with CVBS signals, it can't properly sync but you must first select another input and then switch back to CVBS. LabNation_Screenshot6.png Anyway lately I changed TR4 (ZTX651), TR5 (BC557), TR8 ...

Hi DesSony! Thank you for your suggestion, I already have both of them with a lot of other material. I made some progress in the meantime. First, I wanted to remove the huge heatsink, so I changed the LM7805 with a new switching module, same form factor. I also changed both the input and output capa...

Hello everybody! My name is Federico and I'm from Italy. After many years I finally own a 48k 4A, I bought somewhere from ebay, but it definitely requires some fix. This is the first time I fix a Spectrum, I have a M.Sc. in electronics so I know the basics... but of course, diagnosing and fixing a b...

Hello! I'm Federico, I'm from Italy. I have a M.Sc. in electronics engineering, First time trying to fix a 48k spectrum. I felt in love with computers back in '86, when the dad of a girl at school offered to teach programming, but I was the only one accepting. And I learned on a Spectrum plus, but n...