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A Keyboard/Mouse Switch Unit Introduced

2015-10-16 20:46  
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The following shows the keyboard / mouse switch unit. Also keyboard / mouse switch unit is easy to use. Here are some of the need keyboard / mouse switch unit as well as its principles. If the computer is running, unplug the AC equipment or serial COM or PS2 connector will always be a problem. If you're really unlucky you might have damaged the computer or peripheral devices. In order to successfully switching devices must follow a sequence. Clock and data lines need to disconnect the device in the power lines are removed. And the same power cord must be connected to the new device for the first time on the clock and data lines reconnect. This sequence also uses a USB connector but achieved more simply by using different length pin connector. This circuit is shown in Figure 1 performs electronic switching sequence. Clock and data lines from a computer connected via a relay RE2 North Carolina contacts bistable relay RE1 K3 through the connector. Pressing button S1 will activate the relay RE2 company to disconnect the data and clock lines also depressed the semiconductor switch S1 is IC1B will be opened, allowing the voltage across C4 charge to R4. About 0.2 years after the voltage level high enough to be IC1A C4 switch, which in turn will switch one of the T1 bistable relay coil is energized RE1 and routing clock, data and power connectors K2. When S1 release relay RE2 will switch data and clock lines to the PC via connector K1. It should be noted, the button must be about 0.5 years otherwise the circuit will not operate correctly. Switch to the connector K3 achieve the same press S2. Current required a relatively large switching relay serial interface is necessary to deal with such a relatively large energy is stored in the two capacitors (C2 and C3), and which was charged through the resistor R1 and R6, respectively. Drawback is that the circuit takes about 0.5 minutes to ensure there is enough between switching costs across the  capacitor . Figure:1

Figure 1 

Figure:1

Figure 2 

Figure:1

Figure 3 

Figure:1

Figure 4 

 

Resistors:
R1 = 2kΩ2
R2 = 47kΩ
R3 = 10kΩ
R4 = 4kΩ7
R5 = 1kΩ
R6 = 1kΩ2

Capacitors:
C1 = 10μF 10V radial
C2 = 1000μF 10V radial
C3 = 2200μF 10V radial
C4 = 2μF2 10V radial

Semiconductors:
D1-D5 = 1N4148
T1 = BC547
IC1 = 4066 or 74HCT4066

Miscellaneous:
RE1 = bistable relay 4 c/o contacts
RE2 = monostable relay 2 c/o contacts
K1,K2,K3 = 6-way Mini-DINsocket (pins at 240°,PCBmount
S1,S2 = push-button (ITTD6-R)

 

 


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