elektor shorthand

A large number of queries at the Audio Fair in London show that many new readers have started buying Elektor from no. 7 on. They have not seen the full ex-planation of the terms `TUP` and `TUN` that we gave in Elektor 1, p. 9, nor have they read the further explanation of other `Elektor shorthand` in no. 4, p. 660. For this reason, we are re-printing the latter article in full. We will also regularly reprint the `TUP-TUN` page and the pages of IC-pinning for TTL, CMOS and linear ICs as originally published in Elektor no. 5.