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Old 27th April 2019
Gear Nut

Originally Posted by Stuart72 View Post
The LM317 regulator has probably broken down and must then be replaced. This would be indicated by the voltage output being about 32V instead of 24V.

A 47 ohm / 1W resistor should also be added before the regulator.
I got the exact same response.
I got a whiff of frying electronics, now it's got a buzz that renders it unusable, seems like a flaw in the circuit.

I got a cheap replacement PSU to try after reading about buzzing units on forums.

Originally Posted by zachaction View Post

Bo at Golden Age sent me this photo to demonstrate where and how the resistor goes. I replaced the 24V regulator and added this resistor with the parts Tarheel mentioned, and the noise is gone! It's kind of hard to tell in the pic, but the right leg of the regulator is lifted off the board.