Tag Archives: Schematic

Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.5 Case Cosmetics

Now the Spectrum’s board was fully refurbed and tested working, it was time to turn my attention to the case, keyboard and fascia. The original fascia looked a little tired and was dented so I had ordered a replacement from … Continue reading

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Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.3 Upper RAM Replacement

As I had assertained earlier, the 48K Rubber Key Spectrum I was refurbishing required it’s Upper RAM to be repaired. Since the chips inside of the machine were old, I elected to replace them with a complete Upper RAM Module. … Continue reading

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Summer Developments

It’s been busy at ProjectAVR. I’ve been squirreling away, making up minDUINO kits for the Scouts JOTA event. They are almost finished now. Just a few last minute additions on back-order. The assembly instructions are complete with included circuit diagram … Continue reading

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minDUINOs v1.5 & v1.6 are go

Having received the minDUINO v1.6 boards today, I’ve built one up and it’s all fine. I do like to prove a board before I publish it. I’ll be placing the design files online shortly. As with v1.5, the FTDI module … Continue reading

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Park Life

I have now had a lesson in patience. My PCBs arrived from OSH Park yesterday. They are of top quality. However, I should have checked over my design a few times before submission. On the face of it, they look … Continue reading

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A Walk in the Park

As a slight detour from my own PCB making exploits, let me tell you about a couple of PCBs I’m having made commercially. I am a big fan of the Z80 microprocessor made by ZiLog and have had an itch … Continue reading

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