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#Sinclair zx spectrum symbos for free
Gerbers are available for free download from there. This project is designed by Stephen Smith of and is reproduced here with his express consent! Visit Stephen's website for more useful Sinclair Spectrum projects and add-ons. For those models we recommend the correct cable from Retro Computer Shack. This board is not compatible with 128k models because it does not accomodate sound. I recommend you do your own research and choose the option that best suits you. Some say that it is not necessary at all and others say that, in case the monitor goes faulty or is very badly designed, it can feed voltage back to the Spectrum. There have been many conversations around the need for other components with regard to the composite mod. Option 3 is a single 100uF capacitor which is seen to be the minimum required (Decoupling).the NPN Transistor can be any general purpose device. Option 2 is a simple NPN transistor and resistor mod.However, the composite mod works with all the other monitors I have tried it with. Sadly, the monitor is extremely picky about it’s composite input and is well documented for it. Option 1 is an Inverted Emitter Follower recommended to me in an attempt to get a Dell UltraSharp 2007FP Monitor to work with a 48K Spectrum.Choose which of the three options you would like to use. The PCB itself is very simple, requiring just a few components to operate. The PCB outputs a composite video signal that is compatible with a large range of modern television sets. We recommend that you remove the original carefully and put it in storage, in case you ever wish to re-install it for authenticity.
This compact PCB simply replaces the existing RF modulator PCB in a Sinclair Spectrum 16k or 48k, either rubber key or "plus" case machines.
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