MAESTRO™ FILTER SAMPLE/HOLD REPLICA RTS PCB

The ready-to-solder PCB for a Maestro™ Filter Sample/Hold replica: a synth-style voltage-controlled envelope filter plus a sample-and-hold, something you rarely find in a guitar stompbox.

About the effect

The Maestro™ Filter Sample/Hold combines a synthesizer-style voltage-controlled filter with a sample-and-hold module. It is the same circuit as the Oberheim Voltage Controlled Filter. The envelope filter is excellent on guitar and bass, and the sample-and-hold gives you those random, stepped filter sweeps. Our layout is very similar to the original PCB, only much smaller, with off-board wiring to the pots and switches for more versatile use. It uses single op-amp ICs (741s), as the originals did. Thanks to Rick Lawerence, R.G. Keen and Aron Nelson for helping make this project happen. Watch a demo video.

The complete kit includes this PCB.

Also builds

• The original unit, without modern updates
• Tonda's mods, some of which need no board changes
• A reverse-direction filter sweep mod (needs an extra IC on a small add-on board)

Specs

• PCB size: 8.5 cm x 6.0 cm
• Uses 741 single op-amp ICs
• Solder mask, plated-through holes and silkscreen for component placement

Build resources

• Complete instructions for this PCB
• Instructions (PDF)
• Schematic (PDF)
• Parts layout (PDF)

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