Although I have never yet had an occasion to do this, my understanding of the process of paralleling diodes, especially solid-state ones, is that one must include a low-value resistor, appropriately sized for power, in series with each.

Even so, doing this is not recommended by anyone I remember reading from over the years.

And, of course, adding resistance in the circuit adversely effects regulation.

Ken W7EKB

Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone

-------- Original message --------

From: releazer@earthlink.net

Date: 5/5/24 11:19 (GMT-08:00)

To: arc5@mailman.qth.net

Subject: [ARC5] Paralleling Rectifier Diodes

Yesterday I found a 12/24V 10 amp battery charger someone tossed out.  It seems to work fine on the 12V setting but the voltage output is only 22V on the 24V setting even with no load.  Oddly enough it uses a center tapped transformer and two rectifier diodes to produce a full wave output, although without any filter caps.  It seems that one of the rectifier diodes has an excessive voltage drop on the 24V setting.  How would you parallel rectifier diodes, in case I do not have any suitable diodes to replace the defective one?

Thanks

Wayne
WB5WSV
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