Adequate voltage rating for snubber for this psu?

[riotubes]

I am building two power supplies:

12V transformer >> schottky bridge followed by RC >> -5V discrete regulator >> preamp

115V 50VA trans (.435A) >> schottky bridge followed by RC >> 70V discrete reg >> preamp

I want to insert Haggerman's RC snubber network across the secondaries *before* the schottky bridge. I have Mills MRA-5 resistors (5 watt, 200V rating) and MRA-12 resistors (12 watt, 400V rating). For the caps, I have the 715P series orange drops rated at 600V and 1600V.

I would like to use the smaller mills and orange drops on both the -5V and 70V supplies if possible. Is this doable or must I use the larger mills and orange drops on the 70V supply?

[Robert F]

Hi,

Your voltage and power ratings are OK but your choice of resistor is not. Even so called low inductance wirewound resistors are not particularly low inductance in low values particularly, I suggest you use either Metal oxide or carbon resistors in this application.

Regards,

Rob.

[riotubes]

Thank you Robert! In trying to discover the answer to my question myself, I reread Jim Haggerman's whitepaper on snubbers, and I noted that he recommended carbon comp resistors. I will pick some up. Thanks again.