Projects > Power amplifiers

QRP02 DC out

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peranders:
Are you complete sure that the +-12 V is working properly? When everything work perfectly you'll have a silent and smooth startup and also power down.

I have never distroyed and opamp in such position and nor has the other builders.

I'll guess something isn't solder properly or simply forgotten or some parts are located wrong.The AD8620 has no startup transient what so ever and below 12 volts the LM3886 is shut down so both the servo and the input buffer are working proberly before the LM3886 is.

I suggest that you measure the startup transient at pin1 IC1.

Since you have 1 kohms as R6 a coupling capacitor must be pretty big. Sure you can have it but it's a bit a waste in the same time.

AudioSpirit:
Ok amp is up and running for over 2 weeks now,and I have only positive emotions. Very nice and clean sound,excellent dynamic. I never expected such quality from LM3886! Highly Recommended. 10/10

peranders:
Good to hear that everything are working alright.

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