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Old 23rd July 2008, 02:22 AM   #1
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Default purpose of zener diode in optocouplers

Hi all,

Attached is a feedback circuit from a +/- 37 V..i just want to know is the zener diode in that circuit essesntial.
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Old 23rd July 2008, 02:24 AM   #2
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yes
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Old 23rd July 2008, 10:11 AM   #3
sharmi is offline sharmi  Malaysia
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Your total zener voltage drop is 74V, so is there voltage to the optocoupler ic.
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Old 23rd July 2008, 04:21 PM   #4
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It's a poor man's regulator. The zeners conduct when the voltage is roughly 74V.(+/-37)
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