Cellular /WiFi multi-band embedded flexible PCB antenna
It is equivalent to pulling out the antenna line on the PCB board and using other external metals to do the antenna. It is usually used in medium and low end mobile phones with complex frequency band and smart hardware products.
Advantages: suitable for almost all small electronic products, can do more than ten frequency band of complex antennas, good performance, low cost.
The Picture of PCB/FPC/Ceramic Antenna
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The features of NE555 are:
1. A simple resistor and capacitor can be used to complete a specific oscillation delay. The delay range is extremely wide and can range from a few microseconds to a few hours.
2. It has a large operating power range, and can be matched with logic gates such as TTL and CMOS, that is, its output level and input trigger level can be combined with the high and low states of these logic series.
3. The output current of the output terminal is large, which can directly push a variety of automatically controlled loads.
4. It has high timing accuracy, good temperature stability and low price.
Single board machine automatic reset circuit diagram
Disadvantages: need to be debugged separately for each product.