My DIY Preamp

The preamp design I used is based on this one from Rod Elliott: https://sound-au.com/project97.htm
I made a few small changes and also designed my own board layout. I strongly recommend Rod's site if you are looking to get into audio electronics.
The preamp works splendidly and will be the heart of my control box project. I used high quality parts and that includes the opamps (OP275).
It has controls for bass, treble, volume and balance, plus a switch to turn off the tone controls.
The power supply board also has the bass shaker lowpass filter and output for the Hafler circuit speakers at the rear of my listening room.

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