I'd like to put my limited electronics knowledge to good use but have struggled to think of a worthwhile project. After building an ECG using an microcontroller and a handful of components I ran out of original ideas. I'd like to understand the technology used in toner cartridge chips which stops them working after so many pages. I have a pretty good Dell laser printer which didnt cost very much.Of course the cartridges are ridiculously expensive. I buy in chips from China and refill the cartridges saving 80% of cost of replacement cartridge. I'd like to know how the chips work and I'd like to make my own chips also. Can anyone give me a steer in the right direction ? If they can do it in China.......
