[hpsdr] How to fry Penny/Ozy

[Oleg Skydan]

Hi, Charlos and All !

I used to add two components to my constructions to avoid such troubles.
Just a fuse and a suppressor (something like 1,5KE15 will do the trick for 12V PS)
or high power zenner diode (with 15-25% higher voltage then the nominal PS output).
This will also protect your equipment from the applying power with reverse polarity...

I often see this in the commercial equipment too.

Good luck!
Oleg
73 de UR3IQO
  ----- Original Message ----- 
  From: Charlos Potma 
  To: hpsdr at hpsdr.org 
  Sent: Tuesday, June 10, 2008 10:57 AM
  Subject: [hpsdr] How to fry Penny/Ozy


  ***** High Performance Software Defined Radio Discussion List *****




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  Hi All,

  Last night one of my old and trusted HP power supplies failed in a spectacular way:
  the output voltage went from 12V to 40V. The result was a sputtering and
  smoking Penny output stage, popped capacitors on Atlas and
  some components damaged on the Ozy board.
  Lesson learned: do NOT trust your power supply. I need to build
  a dedicated supply now with overvoltage protection on all outputs...

  73, Charlos Potma, PA3CKR




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