Kits and Modules

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A-B selector with true bypass kit.
£14.95
JFET Matcher V7 kit.
£26.95
Phantom-powered Piezo Preamp.
£17.50
True bypass relay with LED kit.
£6.95
Unbalanced piezo preamp module.
£17.50
A-B Selector Kit (SV105)

Use this kit to provide selection and bypass for your 2-stage effects pedal project.

The design requires 2 momentary action switches, 2 LEDs and M3 mounting hardware in addition to the components provided.

This design has two latching relays. The first relay provides overall bypass and the second relay provides A-B selection. With the unit in bypass, stomping the A-switch puts the pedal into A-mode. Stomping A-switch again goes back to bypass. With the unit in bypass, stomping the B-switch put the pedal into B-mode. Stomping the B-switch again goes back to bypass. If the unit is in A-mode, stomping the B switch goes to B-mode and vice versa.

This means you can switch between two effects or two versions of the same effect with only one stomp.

Specifications:

  • Supply Voltage range 9-20V d.c.
  • Low voltage indicator at 7.3V.
  • Low voltage indicator may be omitted making supply voltage range 7-30V d.c.
  • Dimensions 37mm x 50mm with 39mm mounting centre.
  • Approx 14mm high (excluding stand-off). 

Download a construction and user guide from the downloads tab.

A-B selector with true bypass kit.
£14.95
JFET Matcher Kit (SV104)
For matching N-channel and P-channel JFETS in TO-92 and similar packages.

Matched for Vgs(off), Vgs(10k) and Idss.

Kit contains PCB, components and mechanical bits to build a JFET matcher. Supplied with quick-start guide. Download the full construction and user guide from the downloads tab.

Note that we are now shipping FET7V3 PCBs. Earlier PCBs are coded FET7V1 or FET7V2. Please download the appropriate construction guide.

Included in the kit:
    • Printed circuit board
    • All active and passive components.

Hardware not included:
  • Enclosure
  • Battery (alkaline 9V MN1604/6LR61/PP3)
  • Multimeter 4mm to 4mm test leads
  • Mains power adapter

Disclaimer: The ZIF socket supplied in the kit has been sourced from the far east. It is not a genuine 3M Textool part. 3M and Textool are trademarks of 3M, Inc. Their rights are hereby acknowleged.
JFET Matcher V7 kit.
£26.95
Phantom Piezo Preamp V2 (SV206 (with XLR), SV207 (no XLR))
New model with J113 JFETs and incorporating zener diode input protection.

Professional-quality hand-built piezo preamp module for building into stompboxes, cajons, cigar-box guitars, etc Low distortion, very low noise, wide-bandwidth matched-JFET preamp with XLR output.

  • Suitable for direct connection to mixing console with balanced microphone input and phantom power.
  • Takes away the need for external DI box/preamp.
  • Complete with input cable for direct connection to Piezo transducer element and mounting screws for XLR socket.

Notes: Piezo transducer element not supplied. You will need to fully shield the inside of your instrument using copper foil tape or alternatively mount the unit in a shielded enclosure.

We sell many of these preamps to artists creating installation pieces where they are used to facitlitate musical interactivity between the public and the installation piece. They have also been used for custom mulit-channel electro-percussion instruments.

We sell many of these preamps for use as preamplifier for hydrophone transducers.

Available as an option with the XLR connector not supplied as often customers wish to solder the output cable directly to the printed circuit board.

Phantom-powered Piezo Preamp.
£17.50
True Bypass Relay Kit (SV101)
Kit contains PCB, components and pre-programmed microcontroller to build a true bypass relay which allows you to use a momentary action or latching action stomp switch in your effects pedal and also allows an LED status indicator so you don't need a 3PDT switch.

Supplied with expert construction guide. Download the full construction and user guide from the downloads tab. Note: does not include stomp switch or LED. The latest software revision (1N) allows you to preset whether the effect powers-up in effect-on or effect-bypass mode and also gives an indication that the battery voltage is low.

Specifications: supply voltage: 7-20V d.c., length: 27mm width: 29mm depth (height): 11mm.
True bypass relay with LED kit.
£6.95
Unbalanced Piezo Preamp (SV202)

Professional-quality hand-built piezo preamp module for building into stompboxes, cajons, cigar-box guitars, hydrophones, etc.

Low distortion, very low noise, wide bandwidth matched-JFET preamp with high impedance unbalanced input and 1/4" jack unbalanced output.

  • Suitable for direct connection to mixing console/DAW/Amplifier.
  • Solder connections for piezo element.
  • Panel-mounted via 11mm (7/16") hole.
  • Supplied with 9V battery clip.

This product requires a power supply which may be derived from a standard 9V battery or a regulated, smoothed d.c. power supply with a voltage between 4V and 24V. A power supply voltage between 9V and 18V is recommended.

Note: Piezo transducer element not supplied. Murata 7BB-35-3 recommended. You will also need to fully shield the inside of your instrument using copper foil tape or install the preamp in a shielded enclosure.

Download the user guide from downloads tab.

Unbalanced piezo preamp module.
£17.50
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