The 'Poly-bus' - this bus will save you a lot of time

6-36 — elektor june 1982 the "poly-bus" Designing a proper layout for the bus board was anything but easy. Unlike computer circuits, almost every connec- tion of the three printed circuit boards (VCO, etc.) requires a line to the "out- side world". Figure 1 shows the circuit diagram of the bus board and its inputs. Particular attention must be paid to the VCO board, because the numbers shown do not correspond to those indicated on the printed circuit board. This irregu- larity was brought into line after the other boards were numbered. Figure 1 shows the new numbers which are printed on the bus board. In order to cross-refer to the old (original) con- nection numbers (on the VCO) table 1 should be used. Let"s look at the connections of the bus board from top to bottom to see exactly the "poly bus" this bus will save you a lot of time what their individual functions are (figure 2)! All the printed circuit boards have the same supply voltage connection points (14 ... 16). For this...