Hello,
I've recently built my own rack mounted bass guitar preamp. Connecting to a power amplifier and bass cabinet my preamp works great.
Schematic:
**broken link removed**
However, when I connect my preamp to my pc to record, there is an annoying ground hum. It occurs on both the balanced and unbalanced outputs. I've tired connecting and disconnecting chassis ground to signal ground and disconnecting the ground pin on the balanced TRS output. No luck. I've gone through everything connected to my computer trying to find a ground loop.
The best success I've had so far is chaining my preamp into another preamp that has an isolation transformer on the output. No Hum !
I'm hoping that someone can verify my circuit and perhaps recommend a high quality transformer and how I might connected it to my balanced output (U10).
More information on my preamp can be found here:
**broken link removed**
I've recently built my own rack mounted bass guitar preamp. Connecting to a power amplifier and bass cabinet my preamp works great.
Schematic:
**broken link removed**
However, when I connect my preamp to my pc to record, there is an annoying ground hum. It occurs on both the balanced and unbalanced outputs. I've tired connecting and disconnecting chassis ground to signal ground and disconnecting the ground pin on the balanced TRS output. No luck. I've gone through everything connected to my computer trying to find a ground loop.
The best success I've had so far is chaining my preamp into another preamp that has an isolation transformer on the output. No Hum !
I'm hoping that someone can verify my circuit and perhaps recommend a high quality transformer and how I might connected it to my balanced output (U10).
More information on my preamp can be found here:
**broken link removed**