1, 74HC245
Function: Signal power amplification.
The first pin DIR is used for input/output port conversion. When DIR=“1†high level, the signal is output from “A†terminal to “B†terminal. When DIR=“0†low level, the signal is input from “B†terminal. "End output.
The second to the 9th "A" signal input and output terminals, A1 = B1,,,,,, A8 = B8, A1 and B1 are a group, if DIR = "1" G = "0", then A1 input B1 output, Other similar. If DIR = "0" G = "0", B1 inputs A1 output, and the others are similar.
The "B" signal input and output terminals of the 11th to 18th feet have the same function as the "A" end and will not be described.
The 19th pin G, the enable terminal, if the pin is "1", the signal of the A/B terminal will not be turned on. When only the "0" is enabled, the A/B terminal is enabled, and the pin acts as a switch. Pin 10 GND, power ground.
2, 74HC04
Function: 6-bit inverter.
Pin 7 GND, power ground.
The 14th foot VCC, the Power Supply is positive. The signal is input from the A terminal to the Y terminal inverting output, A1 and Y1 are a group, and so on. For example: A1=“1â€, then Y1=“0â€, A1=“0â€, then Y1=“1â€, the other groups have the same function.
3, 74HC138
Function: Eight-bit binary translation decimal decoder.
Pin 8 GND, power ground.
Pin 15 VCC, positive power supply.
Pins 1~3 A, B, C, binary input pins.
The 4th to 6th chip select signal control, only when the 4th and 5th feet are "0" and the 6th pin is "1", it will be strobed, and the output is controlled by the A, B, C signals. Any other combination will not be strobed, and the Y0~Y7 outputs are all "1". It is cascaded by controlling the strobe pin to extend it to sixteen bits. Example: G2A=0, G2B=0, G1=1, A=1, B=0, C=0, then Y0 is “0†Y1~Y7 is “1â€.
Adapter , also called power supply, generally, it consists of an outside shell, a power transformer and the circuit etc. According to its output, there are AC Adapter , DC adapter and ac dc adapter; According to the connection type, there are wall-mounted adapter and desktop adapter. According to the voltage, there are 12V Adapter and 24V AC Adapter, which are the most common. According to the application, there are laptop replacement ac adapter, Scooter Adapter, Printer Adapter, POE Adapter etc. According to the frequency, there are low frequency Linear Adapter and high frequency charger.
For the adapter, there is a label on it which indicates the input and output etc. Especially for the input, so far, there are two kinds of input voltages, they are 100V~130V and 220V~240V, 110V ~ 130V are classified as low voltage, such as the United States, Japan, etc. their equipments are designed according to such low voltage, focusing on safety; 220V ~ 240V belongs to high voltage, such as China(220V) and Britain(230V), and many European countries, their equipments are designed according to such high voltage, focusing on efficiency. So in order to meet the input needs of different countries, Yidashun designs the 100V~240V for worldwide use.
Yidashun's adapters have below advantages:
1. Worldwide input voltage: 100V~240V
2. High quality and high efficiency
3. Stable output.
4. Low operating temperature and long usage life
5. Good insulation performance.
6. Good anti-interference performance.
Yidashun can customize chargers and power adapters as your requests, OEM & ODM order are welcomed!
Adapter
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Shenzhen Yidashun Technology Co., Ltd. , https://www.ydsadapter.com