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Appendix A: Schematic Symbols
Appendix A: Schematic Symbols

... 1. The ratio of output voltage to input voltage is called the voltage gain of an amplifier. 2. The BJT, or bipolar junction transistor, is a transistor that can either be NPN or PNP. 3. An integrated circuit is a functional drop-in circuit module available in DIP packages. 4. Current gain is also ca ...
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Chapter 24: Capacitance and Dielectrics and Ch. 26
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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