Keyboard/Mouse Changeover Switch
Published in issue 312, July 2002
Old PCs are usually not immediately discarded after the purchase of a new one, but often remain in use for certain tasks. To avoid being tied to two keyboards and two mice when operating two PCs it would be nice if there was some kind of simple switch that would easily change the keyboard and mouse over from one PC to the other. That is the purpose of this circuit. The connections are made with four PS/2-cables (male/male). If one of the PCs requires a 5-pin DIN connector, an adapter cable or plug is also necessary. For the mouse an adapter plug from PS/2 to 9-pin Sub-D is also available, if required.
Resistors:
R1,R2 = 1MOhm
R3,R4 = 220kOhm
R5,R6 = 2kOhm 7
R7 = 15Ohm
Capacitors:
C1,C2 = 470nF
C3 = 10nF, lead pitch 5mm
C4,C5,C6 = 100nF ceramic, lead pitch 5mm
C7 = 100µ F 10V radial
Inductors:
L1 = 47µ H
Semiconductors:
D1-D8 = BAT85
D9,D10 = red and green LED, 3mm, high efficiency
IC1,IC2 = 74HC4066
IC3 = 74HC02
Miscellaneous:
K1-K6 = mini-DIN6/PS2 socket (female), PCB mount
S1,S2 = pushbutton, e.g., ITT/Cannon switch D6-C-40 (square, red) and/or D6-C-50 (square, green); optional snap-on button BTN-D6-40 (red) BTN-D6-50 (green)
PCB, order code 024068-1
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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