Zeppelin Design Labs has released the Cortado piezo contact pickup. What makes this pickup unusual is that we run the signal through a buffering / balancing circuit, which matches the high impedance from the piezo to the low impedance required by a recorder or mixing console. The Cortado has a XLR male jack for output. You can plug your CBG straight into a mic cable and direct to front-of-house. This pickup delivers a spectacular signal-to-noise, and a flat response across a wide frequency range. The result is a bright, clear signal that can easily find its place in a mix.
This guy comes in a DIY kit, or ready-to-play as shown above. The ready-to-play mic can be stuck to your CBG with a piece of tape. The kit can be configured more as a pickup and installed inside the guitar.
Most CBG players are not playing in big bands where they get lost in the mix, I know. But as a DIY guy, you may find this device intriguing in its own right.
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For the electronically-inclined, here's the schematic of the circuit we use in the Cortado, originally developed by Alex Rice. The mic kit comes with a cute little printed circuit board and all the components, including a closely-matched pair of FETs for use at Q1 and Q2.
Coming next: an entire acoustic band mic'ed up only with Cortados.