BUGLE3 Phonostage Kit PCB
6
Testing
Apply power to 24Vdc jack. Led should light up! If you have a DVM, check power supply
voltages on opamp pins 4 and 8. U1 should be powered by r/-10V.
Loading & Gain
Switch
Load
Gain
0
47k
40dB
1
553
60dB
2
100
50dB
1 + 2
85
64dB
Troubleshooting
If audio quality is not good, double-check all resistor values to make sure they were
installed into correct locations.
If a channel has a scratchy sound to it (not a nice clean, quiet hiss) then it is likely the
input opamp has been damaged and should be replaced. These devices are very
sensitive to ESD and precautions must be taken. Hum, buzz, and other noise sources
(WiFi) can be induced into the Bugle2 and/or input cables. Place as far from other
equipment as possible.
