Myriad Design

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Fairchild 2N5457 N-channel JFET TO-92 - Matched Pair
£2.95
Fairchild 2N5457 N-channel JFET TO-92 - Matched Quad
£4.95
Fairchild 2N5950 N-channel JFET TO-92 - Matched Pair.
£1.95
Toshiba 2SK170BL N-channel JFET TO-92 - Matched Pair
£3.95
A-B selector with true bypass kit.
£14.95
Piezo Preamp for your Pocket
Out of Stock
£67.00
JFET Matcher V7 kit.
£27.95
Fairchild PF5102 N-channel JFET TO-92 - Matched Pair
Out of Stock
£1.45
Fairchild PF5102 N-channel JFET TO-92 - Matched Quad
Out of Stock
£3.25
Phantom Piezo Preamp V2 Enclosed.
£48.00
Phantom-powered Piezo Preamp.
£22.95
Re-amper for your DAW.
£79.00
True bypass relay with LED kit.
£7.45
Unbalanced piezo preamp module.
Out of Stock
£22.95
2N5457 Matched Pair (SV601)
Fairchild 2N5457 N-channel JFET TO-92 - Matched Pair.

***Note - obsolete part - limited availability - not for new designs***

2N5457 - N-Channel Low-Frequency Low-Noise Amplifier pair matched for Vgs(off) and within 0.1mA variation on Idss (Idss match typically <= 0.05mA).

Supplied with Stompville test data. Matched Quads also available.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Fairchild 2N5457 N-channel JFET TO-92 - Matched Pair
£2.95
2N5457 Matched Quad (SV602)
Fairchild 2N5457 N-channel JFET TO-92 - Matched Quad.

***Note - obsolete part - limited availability - not for new designs***

2N5457 - N-Channel Low-Frequency Low-Noise Amplifier quad (4-pieces) matched for Vgs(off) and within 0.1mA variation on Idss (Idss match typically <= 0.05mA).

Supplied with Stompville test data. Matched Pairs also available.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Fairchild 2N5457 N-channel JFET TO-92 - Matched Quad
£4.95
2N5950 Matched Pair (SV603)
Fairchild 2N5950 N-channel JFET TO-92 - Matched Pair.

***Note - obsolete part - limited availability - not for new designs***

2N5950 - N-Channel Low-Frequency Low-Noise Amplifier pair matched for Vgs(off) and within 0.15mA variation on Idss.

Supplied with Stompville test data. Matched Quads also available.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Fairchild 2N5950 N-channel JFET TO-92 - Matched Pair.
£1.95
2SK170BL Matched Pair (SV616)
Toshiba 2SK170BL N-channel JFET TO-92 - Matched Pair.

***Note - obsolete part - limited availability - not for new designs***

2SK170BL - N-Channel Low-Frequency Low-Noise Amplifier pair matched for Vgs(off) and within 0.1mA (typically ~0.05mA) variation on Idss.

Supplied with Stompville test data.

Note: these items have been sourced from China (not a Toshiba approved distributor) and provenance is not proven. However, the supplies we have at Stompville appear to be legitimate and test within Toshiba published specifications.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Toshiba 2SK170BL N-channel JFET TO-92 - Matched Pair
£3.95
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
Altoids Piezo Preamp (SV802)
Stompville piezo preamp built into an Altoids tin. Suitable for passive piezo transducers (violin, cello, double bass, cajon, stompbox, percussion, mandolin, ukelele, etc.), homebrew hydrophones, and preventing tone suckage on your electric guitar.

9V battery-powered with very low power consumption and low-battery LED light.

Professionally hand-built from a tried and tested design using closely matched JFET transistors. Extremely low distortion and noise. Supplied with user guide. Battery not included.

Please note that the preamp is built into a genuine used Altoids tin and the tin will likely not be in perfect condition. Please expect small scuffs and dents and minor damage to the paint finish. Such imperfections are not to be considered manufacturing defects of the Piezo Preamp and are not cause for product returns.

Battery not included.
Piezo Preamp for your Pocket
Out of Stock
£67.00
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.
£27.95
PF5102 Matched Pair (SV604)
Fairchild PF5102 N-channel JFET TO-92 - Matched Pair.

***Note - obsolete part - limited availability - not for new designs***

PF5102 - N-Channel Low-Frequency Low-Noise Amplifier pair matched for Vgs(off) and within 0.15mA variation on Idss.

Supplied with Stompville test data. Matched Quads also available.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Fairchild PF5102 N-channel JFET TO-92 - Matched Pair
Out of Stock
£1.45
PF5102 Matched Quad (SV605)
Fairchild PF5102 N-channel JFET TO-92 - Matched Quad.

***Note - obsolete part - limited availability - not for new designs***

PF5102 - N-Channel Low-Frequency Low-Noise Amplifier quad (4-pieces) matched for Vgs(off) and within 0.15mA variation on Idss.

Supplied with Stompville test data. Matched Pairs also available.

Note: If you re-test Stompville items against Stompville-supplied data, the results you get will depend on the test voltage, prevailing room temperature and for how long you apply current to the devices (which will affect Idss as the device heats up). The important issue is that the pair will be closely matched to each other even if they are not exactly the Stompville values.
Fairchild PF5102 N-channel JFET TO-92 - Matched Quad
Out of Stock
£3.25
Phantom Piezo Preamp (SV806)
Phantom Piezo Preamp V2 fully enclosed with 3.5mm input jack and XLR output jack.

This is the same design as the tried-and-tested Phantom Piezo Preamp V2 Module. We have reworked the design to fit into an extruded aluminium enclosure which is only 73.5mm (2.9") long.

There is a balanced input on stereo 3.5mm jack which can be wired unbalanced if required and a balanced output on XLR which should be connected to your portable recorder, mixing desk or DAW which provides phantom power (preferably 48V).

This preamp is suitable for connecting directly to piezo transducers and is ideal for musical/art installations, hydrophones, custom/bespoke percussion instruments, stomp boxes, tap dance, clog dance boards, etc.

The preamp takes the place of a DI box and provides about 12dB of voltage gain.The professionally hand-built and tested preamp unit is supplied on its own with user guide, but without input or output leads or accessories.

We carry parts in stock to make more preamps so if you require more preamps than are available, please email and we can build a batch to order. Lead time is generally a few days.
Phantom Piezo Preamp V2 Enclosed.
£48.00
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.
£22.95
Stomville re-Stomp Re-amper (SV801)
Professional quality hand-built passive level-and-impedance converter with transformer-isolated output for converting balanced line-level audio to an unbalanced signal similar to the output of an electric guitar.

For re-amping and generally re-processing cleanly-recorded guitars and other instruments through real-world effects chains and amplifier/speaker combinations.

  • Neutrik balanced XLR input
  • Neutrik 1/4" jack unbalanced output
  • Output level control
  • Ground lift switch
  • Transformer-isolated between studio and guitar amp.
  • Passive design - no batteries or power supply required

There is an internal zobel network which is individually tuned to the audio transformer to maximise frequency response and minimise signal distortion.
Re-amper for your DAW.
£79.00
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.
£7.45
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.
Out of Stock
£22.95
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