Let’s rollback the hobby electronics calendar a few decades with [myvideoisonutube’s] alarm activation control circuit using a matrix style phone keypad. The circuit is quite old using … ...

A UPC code consists of a 1-digit number, a 5-digit manufacturer's code, a 5-digit product code, and a single check digit. The first digit is a standard numbering system character assigned by the ...

Martin Lewis has urged mobile phone users to dial a five digit code now - and screen grab the result. The money expert provided the advice to his ITV viewers on Tuesday night after revealing that ...