The 555 timer has low cost and reliable performance. It only needs several external resistors and capacitors to realize pulse generation and conversion circuits such as multivibrator, monostable trigger and Schmitt trigger. It is also widely used as a timer in instrumentation, household appliances, electronic measurement and automatic control. The internal circuit block diagram of the 555 timer is shown on the right.
It consists of two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage.
It consists of two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage.
Dual-band Bandpass Filters (BPFs) provide the functionality of two separate filters, but in the size of a single filter. Dual band pass filter applications are at the leading edge of fiber optical modules and systems. Using DBPFs is a new concept in multiplex and de-multiplex module design used in optimizing wavelength ranges or channel management. The application of DBPFs makes it possible to reduce the component quantity in optical modules, enhances their performance, and enables faster data transfer in the optical backbone of major networks.
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