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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 19th February 2019, 11:39 PM   #391
avtech23 is offline avtech23  Australia
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Quote:
Originally Posted by xrk971 View Post
Did you see or smell smoke on the main amp board when this happened? The fact that the PSU is still good is a great sign because that means you did not put more than 310mA of current into the amp.

2. The main rail smoothing caps C121/124 were reverse biased and probably damaged - lucky they did not blow up like a firecracker as that is the most dangerous thing to happen if your face is nearby. Replace those. In a pinch just remove them and amp will still work - re-install new ones later.
Thanks for the pointers, X.

There as no heat or smoke, the only indication I got of a fault condition was a pulsing voltage - presumably the bench supply or perhaps the voltage regulators detecting a short.

Your point 2 is why I always wear eye protection when energising a circuit outside of a closed chassis.

Thanks again, I'll get some spares on hand and get the chassis finished in the meantime.
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