Piezo pickup impedance converter
About the Piezo pickup impedance converter PCB
Piezo pickup impedance converter is an open source PCB design by compuphase, published on GitHub. It is a 2-layer board measuring 32 × 4 mm, with 12 components from 9 distinct parts.
Other key parts include the OPA323. By type, the board carries 4 capacitors, 4 resistors, 2 connectors, 1 IC and 1 diode.
From the project
High impedance preamplifier for piezo pickups
The designs are in KiCad. PDFs with the schematics, and the Gerber files for the PCBs are also provided.
It is a pretty classic opamp circuit. Amplification is fixed at 1× —the circuit is only to adapt the impedance (piezo bridge pickups are pretty loud already). The main feature of the circuit is that it is compact, and especially narrow. The idea is to fit this preamplifier into a slot immediately below the pickup.
Main components on the Piezo pickup impedance converter
Piezo pickup impedance converter bill of materials (BOM)
12 components, 9 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPA323 OPA1677 | SOT23-5 | U1 |
| 1 | piezo | PinHeader_1x02_P2.00mm_Vertical | J1 |
| 1 | output | PinHeader_1x03_P2.00mm_Vertical | J2 |
| 1 | TVS 6V | SOD523 | D1 |
| 1 | 220N 1u | 0603 | C1 |
| 1 | 220N 10p | 0603 | C2 |
| 2 | 68P 1u | 0603 | C3, C4 |
| 2 | 2M2 22k | 0603 | R1, R2 |
| 2 | 100K 820k | 0603 | R3, R4 |
Piezo pickup impedance converter design files
The KiCad project lives in the compuphase/piezo-preamplifier repository on GitHub; these links point at the commit this page was built from.
Piezo pickup impedance converter: common questions
How big is the Piezo pickup impedance converter PCB?
The Piezo pickup impedance converter measures 32 × 4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Piezo pickup impedance converter?
12 components, from 9 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Piezo pickup impedance converter design files?
From the compuphase/piezo-preamplifier repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Piezo pickup impedance converter design in my own project?
The repository has no license, so all rights stay with compuphase. Use it as a reference, and ask the author before reusing the design.
