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The OPA627's in my VSPS have blown.
The OPA627's in my VSPS have blown.
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Old 10th January 2005, 11:01 PM   #1
Shoog is offline Shoog
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Join Date: Aug 2002
Location: Eire
Default The OPA627's in my VSPS have blown.

Hi there,
I came to use my VSPS phono amp, and nothing came out. Tested the circuit and everything measures fine. Looks like the input Fets of the OPA627's have been spiked somehow, and no longer work.
We had a lightning strike recently which took out my Modem, but I don't think it was this.
My question is can I protect the input Fets with diodes without degrading those sensitive little signals ?

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Old 11th January 2005, 12:52 AM   #2
BrianL is offline BrianL  United States
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Join Date: Mar 2002
Location: USA
The OPA627's in my VSPS have blown.
Read the OPA627/637 datasheet and look at the section on
input protection.

If you use the external diodes and resistor, make sure the
diodes (or FETs wired as diodes) have the lowest capacitance
and flattest capacitance-vs-reverse-voltage, as well as low leakage.
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