The overvoltage protection circuit 5v

If you want to cut output at 6v can be configured according to the formula to calculate the top, measured 5.8v output cut, but to about 10v when the circuit began to smoke, although it was restored to the 5v to work but still need to continue to adjust the parameters

But a little less than a protective circuit: tubes are normally open, over-voltage on a power zener did not react to the load has been dry dead, Zener response is still too slow

Or directly add TVS forget

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