Optoelectronic relay circuit using operational amplifier
Source: InternetPublisher:清宁时光 Keywords: Optoelectronics operational amplifiers relay circuits BSP Updated: 2020/03/12
It uses an operational amplifier and a phototransistor VTi as the detection element. In the figure, Ra
is the feedback resistor, and its size determines the amplification factor of the operational amplifier; RP. It is the zero adjustment potentiometer; Cl and R. Complement the
taste with phase. If LM324 operational amplifier is used, Cl and R4 can be deleted.
When no light shines on the phototransistor VTi, pin 6 of operational amplifier
A outputs a high level, and the transistor VTz
guides the relay KA. When there is light, pin 6 of A outputs a low level, VT2 cuts off, and KA freed.
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