For audio balanced line inputs I use a 470R followed by a BAT720S to the rails. There are 12VMOVs across the rails to absorb the injected current before the 22V rated opamps get destroyed. I also put a 1n cap after the
470R, so the 120p of the combined diodes do not hurt in this application. This way the semiconductors survive even an accidental mains on the input. The 470R resistor acts like a fuse. The BAT720S is 1A rated, cheap and in SOT223. 1A/460mV; 5A/ 0.9V
Sorry I mixed up the number
*BAT140S*Joerg ...
I did the same thing, only mine was a forum after which this little Chicago blonde and I "disagreed" on a technical point.
Today is our 8th anniversary.
Jim
The first time I had to do that in my career resulted
REALLY bright women are the preferred embodiment !-)
...Jim Thompson
Hello Ban,
That is a good diode but 45c isn't exactly cheap. I could only see it at Philips (I wish they would stop that stupid stock quote wait on their site, when do they learn?). Single sourced?
It does cave in around 2amps but that may be ok if there is another resistor between the BAT140S and the device pin.
Regards, Joerg
Either that or a good bar-be-que. Man can't have both. Cheers, Harry
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