Project 122 from Elliott Sound Products is a very small and simple, “utilitarian” microphone preamp. The circuit is based around a single NE5532 opamp, and provides 37dB of gain in its standard configuration.
- PCB-mount potentiometer and XLR input jack
- 3dB/octave rolloff at 104Hz
- Extremely compact design
Price: $18 for PCB
More information at ESP’s website.