purpose of zener diode in optocouplers

jegandren · 23rd July 2008, 02:22 AM

Hi all,

Attached is a feedback circuit from a +/- 37 V..i just want to know is the zener diode in that circuit essesntial.

sawreyrw · 23rd July 2008, 02:24 AM

yes

sharmi · 23rd July 2008, 10:11 AM

Your total zener voltage drop is 74V, so is there voltage to the optocoupler ic.

switchmodepower · 23rd July 2008, 04:21 PM

It's a poor man's regulator. The zeners conduct when the voltage is roughly 74V.(+/-37)

23rd July 2008, 04:21 PM	#4
switchmodepower diyAudio Member Join Date: May 2007	It's a poor man's regulator. The zeners conduct when the voltage is roughly 74V.(+/-37) __________________ http://www.switchmodepowersupply.net

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23rd July 2008, 02:24 AM	#2
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	yes

23rd July 2008, 10:11 AM	#3
sharmi diyAudio Member Join Date: Jul 2008	Your total zener voltage drop is 74V, so is there voltage to the optocoupler ic.

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