I recently built two ESP project 3A amps from the official circuit board. One works excellently but the other will get hot fairly quickly because it draws over 600mA of quiescent current! The trimmer pot VR1 measures 2.02 kOhms and even when I short the other 1K fixed bias resistor (R16) the current only goes to around 480mA.
I have replaced Q9 (bias servo) and Q6 (driver) and neither fix helped. I no longer have a working oscilloscope either so I use a multimeter to measure drop on the 5 watt output resistors.
Has anybody fixed this issue themselves? Does anyone know what the potential errors with my amp could be? Thank you all.
I have replaced Q9 (bias servo) and Q6 (driver) and neither fix helped. I no longer have a working oscilloscope either so I use a multimeter to measure drop on the 5 watt output resistors.
Has anybody fixed this issue themselves? Does anyone know what the potential errors with my amp could be? Thank you all.