Swith For diagram

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5 74HC148 to allow expansion of the end of Gs, respectively, received the sixth piece of 74HC148 low slices to a high order of the film I 0, I 1, I 2, the I 3 I 4 input, I 5, I 6 I 7 end is connected to high (no input), so the sixth three-chip 74HC148 output would mean that the 40-6 line priority encoder of three the A5. A4, A3. 40-6 line priority encoder low three output A2, A1, A0 5 74HC148 output terminal. 74HC148s output is not tri-state gate, can not be directly connected together. 5 74HC148 output of the same name received 74LS30 (8-input NAND gate) can be taken with non-solve this problem. The good service of  cell phone jammers  can be got with the lowest cost.
Terminal expansion, and 2051 less than the 89C51 P0 and P2, input / output port and an external ROM, the RAM in the pin 2051 is only 20 feet. AT89C2051 microcontroller is mainly applicable to relatively simple micro-control system. In this system, used in the AT89C2051 the six external I / O port, an external interrupts and serial output port. 12 Hangzhou University of Electronic Science and Technology graduate design 4-92051 signal pin Figure 4.5-level translation in the different digital systems, the level of the standard is different. The system includes a TTL level standard and RS-232 level standards, to achieve two standard normal communication, the need for level conversion. The harmonious production environment of  cell phone jammers  is necessary.cell phone jammers for the star gazing has very high requirement
Can guarantee the quality of training and reducing the consumption of ammunition is the ideal of public security, military and other departments trained to use the analog targeting system. The laser targeting system overview of the laser targeting system [1-3] works by using laser pulses to simulate the firing of bullets, the system generally includes a laser transmitter and laser signal detection module, shooting performance and display parts. Shown in Figure 2-1, when the shooter aimed at the completion of the pull the trigger, the semiconductor laser emits laser pulses fired at the target on the photodetector, if you hit the target, the laser pulse photodetector receiver and converted to electric signal processing circuit can identify the point of impact of the shooting, transfer to your computer encoded signal is processed.

In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TIP35 or similar

The 4th comparator is used to generate a time delay after the normally closed switch is opened. Two resistors (36K and 62K) are used as a voltage divider which applies about two-thirds of the battery voltage to the (+) comparator input, or about 2 volts. The delay time after the switch is opened will be around one time constant using a 50uF capacitor and 100K variable resistor, or about (50u * 100K) = 5 seconds. The time can be reduced by adjusting the resistor to a lower value or using a smaller capacitor. Longer times can be obtained with a larger resistor or capacitor. To operate the circuit on higher voltages, the 10 ohm resistor should be increased proportionally, (4.5 volts = 15 ohms).