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Original Message

GZ34: getting too much voltage drop

Posted by banpuku on February 11, 2017 at 06:13:55:

The GZ34 rectifier is supposed to have a voltage drop of 17V. Per the attached schematic, it appears as though there is too much voltage drop, as the voltage measured at the GZ34 pin is 290V. Is this voltage drop reasonable or is something wrong here? I thought I would be getting about 300-310V coming out of the GZ34. Thoughts?


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UPDATE: Resolved by vetmedrobert@gmail.com.

You have 670 volts into a choke. the formula is VAC*0.45, or 670*0.45= 302.5 volts. This for a full wave rectifier as you have in your schematic. Then you must allow for the rectifier voltage drop which depends upon your circuit's current draw.

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