A printed circuit board (PCB) for interconnections comprising:
- a first column of n circuit trace terminals placed very close to the left edge of the board, where n at least equals to 4;
- a second column of n circuit trace terminals placed very close to the right edge of the board and on the same rows with the circuit traces terminals in said first column;
- a third column of n plated through holes, wherein each plated through hole is placed next to the right of and in electrical contact with each circuit trace terminal on the same row in said first column;
- a fourth column of n plated through holes, wherein each plated through hole is placed next to the left of and in electrical contact with each circuit trace terminal on the same row in said second column;
- a fifth column of four circuit-trace terminals placed in the same column with said first column;
- a sixth column of four circuit trace terminals placed in the same column with said second column;
- a seventh column of four plated through holes placed in the same column with said third column, wherein each hole is placed next to the right of and in electrical contact with each circuit-trace terminal on the same row in said fifth column, and one hole may be used as an input-signal hole and the other holes may be used for power-supply connections;
- an eight column of four plated through placed in the same column with said fourth column, wherein each hole is placed next to the left of and in electrical contact with each circuit-trace terminal on the same row in said sixth column, and one hole may be used as an output-signal hole and the other holes may be used for power-supply connections;
- a ninth column of n plated through holes, wherein each of the holes from number 2 to number (n−1) is electrically connected to the hole of the same order number in said third column with a circuit trace, which is not in electrical contact with the holes and circuit traces in any other columns;
- a tenth column of n plated through holes, wherein holes from number 2 to number (n−1) are electrically connected together by a plurality of circuit traces which are also electrically connected directly or indirectly via jumping connectors to the input-signal hole in said seventh column;
- an eleventh column of n plated-through holes, wherein each of the holes from number 2 to number (n−1) is electrically connected to the hole of the same order number in said fourth column with a first circuit trace and to the hole on the same row in said ninth column with a second circuit trace, said first circuit trace and said second circuit trace are not in electrical contact with the holes and circuit traces in any other columns;
- a twelfth column of n plated-through holes, wherein holes from number 2 to number (n−1) are electrically connected together by a plurality of circuit traces which are also electrically connected directly or indirectly via jumping connectors to the output-signal hole in said eight column;
- a first group and a second group of circuit traces for connecting between said plated through hole in each of said columns;
- and
- at least one pad formed around each hole of said plated through holes in each of said columns.