Why DFLZ39 Zener diodes for +12V input isolation?

opencomputeproject / Time-Appliance-Project

Develop an end-to-end hypothetical reference model, network architectures, precision time tools, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...

MIT License

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Why DFLZ39 Zener diodes for +12V input isolation? #14

Closed wisxxx closed 3 years ago

wisxxx commented 3 years ago

The forward voltage drop of +1.2V seems excessive for simple isolation.

ahmadexp commented 3 years ago

It will be removed. This was placed when we had the backup power source as well to keep the MAC up during short power cycles/loses

AlphaBetaPhi commented 3 years ago

This is removed in the latest revision. Issue will be resolved with the next revision push.