Since I moved into my current house, I had on many occasions, received complains from my visitors, and sometimes I myself, that there was a small electric tingling shock whenever any one of us touched the steel housing of the […] ↓ Read the rest of this entry…
During my experimentation, I somehow made costly mistake(s) and found that the parallel port installed at my computer was not working properly after one initial successful testing. Subsequent testing were failures. I did not know why and when it occurred. […] ↓ Read the rest of this entry…