[sdiy] The annual I/O impedance/protection thread! (revised)

[Justin Owen]

Thanks Harry - that's awesome.

You mentioned in one of your emails yesterday that you didn't think the Zeners were necessary. Is that for all of these inputs, outputs and summers - or have I misinterpreted that?

It does seem like by the time you protect them and sort out any impedance adjustments that causes then you're already on your way to just wearing the cost of a repair.

Anyone else got any thoughts on that?

Can't say I see many other people using them - but then I don't see many people using PTCs on their power supply - and I'm completely converted on that one.

Latest changes made and uploaded if anyone else is interested...

http://www.sdiy.org/juz/euro_input_03.pdf
http://www.sdiy.org/juz/euro_output_03.pdf
http://www.sdiy.org/juz/euro_summing_03.pdf

J