vocoder (2) - construction and alignment

2-14 — elektor february 1980 vocoder (2) construction and alignment Last month, we explained the basic principles of the Elektor vocoder. From the block diagrams and circuits given, it should be clear how the unit works — once you"ve built it. And that is what this article is about: the printed circuit boards, full constructional details and calibration procedures. Every effort has been made, at the design stage, to make this a straightforward project for the home constructor; the extensive explanation of the construction given here is intended as the necessary "software backup!" First, let"s put one thing right. Last month, we stated that there were to be twelve printed circuit boards. Wrong: there are fourteen now. The wiring between the twelve original boards was getting so extensive that it was decided to plug them all into a so-called "bus board" that runs along the back of the case. This board turned out to be so long that it had to be cut in two, for postal reasons. All...