Steve,
I do not think that shunt resistors are necessary at all. But it would
be better if you reduce the diodes number by using higher voltage
ones.
73, Val LZ1VB
G’day
I am refurbishing the power supply board in my Alpha 91b and am
going to replace the KD202P diodes which make up the bridge with
6A10 diodes (1000V 6A and only A$1.95 each).
The original bridge had strings of five KD202P a side, with shunt
resistors across each diode of 500K 1W. The stud mounted diodes are
looking pretty burnt around the retaining washers/bolts, so it is
definitely time (and I have a strange earth leakage fault).
Please, I’d really appreciate some advice about what value of shunt
resistor to use on each of the twenty 6A10 that will make up the
bridge?
PS The replacement encapsulated bridge rectifier sold by Alpha/RKR
designs (5kV, 2A) is US$150, so this the reason for looking for a
cheaper solution.
Vy 73
Steve, VK6VZ
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