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As SMD I didn’t find electrolyte capacitors In your use case it's not necessary to use a polarized capacitor. Any 4u7 capacitor will do. In SMD you find larger non polarized capacitors than in through hole. Kind regards Paul P. S. https://m.reichelt.de/Elkos-SMD-Low-ESR-105-C/2/index.html?ACTION=2&...
You could have a closer look at the 48p-kdlx from Pokémon. He enables extra keys without extra lines (just 8+5) and makes energy harvesting from the keyboard lines. He uses low power ICs for this. There is a Schematic in the tlienhard forum. Kind regards Paul Edit: name correction and specify the pr...
- Mon Sep 02, 2019 6:27 pm
- Forum: Hardware
- Topic: A homemade ZX81 keyboard of wood
- Replies: 13
- Views: 682