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Figure 6: C817 Optocoupler The maximum allowed collector-emitter voltage of the PC817 is 80V. This specification applies to safe operation in high-pressure environments. Circuit designers need to ensure that the voltage level remains below this threshold to prevent the risk of electrical failure or damage to the optocoupler.
We can use the optocoupler to transfer electronic signals between two isolated circuits. This is one of its more important attributes. Sometimes, voltage spikes and noise may occur in one circuit. Without the optocoupler isolating the circuits, these disruptions may spread to the second circuit and cause destruction.
While optocouplers can replace relays in some situations, this depends on the specific load and application requirements. Optocouplers are suitable for low current, low voltage, and signal level applications, while relays are suitable for high current and high voltage load control.
This can be done by using the diode test function of your multimeter. Signal response test: Input a signal of known frequency to the input end of the optocoupler and check whether the output end can accurately replicate the frequency and waveform of the input signal.
Sometimes, voltage spikes and noise may occur in one circuit. Without the optocoupler isolating the circuits, these disruptions may spread to the second circuit and cause destruction. The optocoupler prevents this damage from occurring in both circuits.
The forward voltage of the PC817 optocoupler input diode is specified to be 1.25V. This parameter determines the minimum voltage required for the infrared LED to operate properly. The operator must ensure that the circuit design provides at least this voltage to ensure that the optocoupler activates as expected. Figure 6: C817 Optocoupler
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