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Touchstone24
Touchstone24
F
MODULATION
X Type:
Build Level: Intermediate
Based On: EHX® Small Clone™
The 2024 version of the Touchstone has no circuit changes and minor layout tweaks.
It's warm. It's lush. It's a classic! The Touchstone is based around the big box MN3007 Small
Clone. A little less complicated than the venerated CE-2 but a righteous chorus all on its own.
Capable of dense slow chorus tones while the large depth range can take you well into seasick
territory. If you've never built/played a Small Clone you will not be disappointed.
RATE, DEPTH: Min to max in both controls.
T1: This trimmer sets the bias for the input of the MN3007.
This link has some interesting info and history on the Small Clone:
https://www.ehx.com/forums/viewthread/5555
Terms of Use:
You are free to use purchased Touchstone24 circuit boards for both DIY and small commercial operations. You may not offer Touchstone24 PCBs for
resale or as part of a "kit" in a commercial fashion. Peer to peer re-sale is fine, though.
Technical assistance
for is available via the
available to respond via email in a timely and continuous manner, and (2) posting technical problems and solutions in the forum creates a record from which other
members may benefit.
All copyrights and registered trademarks are property of their original owners. Any mention of trademarked or intellectual properties in this documents is purely for
comparative purposes.
Overview
Controls
madbeanpedals
forum. Please go there rather than emailing me for personal assistance. This is because (1) I'm not always
Last Updated:
August 17, 2024 5:53 PM
© 2024
madbeanpedals

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Summary of Contents for madbeanpedals Touchstone24

  • Page 1 Terms of Use: You are free to use purchased Touchstone24 circuit boards for both DIY and small commercial operations. You may not offer Touchstone24 PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is fine, though.
  • Page 2: Parts Layout

    Parts Layout Touchstone24 pg. 2...
  • Page 3: Component Values

    Component Values Touchstone24 pg. 3...
  • Page 4 Trace Layout Touchstone24 pg. 4...
  • Page 5 Wiring The Touchstone24 is compatible with both the SSBP and SSABP bypass boards available at madbeanpedals. The wiring is the same for both. Touchstone24 pg. 5...
  • Page 6 B.O.M. Resistors Resistors Caps Diodes 1n914 220k 180k 1n914 1N4001 Transistors 120k 2N5087 470k 2N5088 2N5088 470pF 4558 MN3007 100k 180pF CD4047BE LM358 Trimmer 100k 150pF Pots 10uF DEPTH 10kB RATE 10uF 10uF 100uF 100n 220k 22uF Touchstone24 pg. 6...
  • Page 7: Shopping List

    Film 16v min. Film 16v min. Film 16v min. 100n Film 16v min. Film 16v min. Additional Hardware (1) 125B enclosure (2) 1/4” mono jacks (1) Slim 2.1mm DC jack (1) Standard 3PDT footswitch (1) 5mm LED Touchstone24 pg. 7...
  • Page 8 You should be able to adjust the fastest speed possible by lowering R26 (not tested). Doing so will shorten the max slow speed, as well. • C13 is a Bi-Polar cap. Be sure to use the correct part here. MN3007: https://smallbear-electronics.mybigcommerce.com/ic-mn3007-audio-bbd-dip-8-xvive/ https://smallbear-electronics.mybigcommerce.com/ic-mn3007-bbd/ https://synthcube.com/cart/mn3007-xvive-audio?search=mn3007&description=true https://cabintechglobal.com/mn3007 - CHEAPER PRICE! Touchstone24 pg. 8...
  • Page 9: Circuit Voltages

    • Current Draw ~ 6mA • The VD, VC and VB pads on the PCB are for reference only. You can use them to verify you have voltage on each of the supply rails, if you like. Touchstone24 pg. 9...
  • Page 10: Drill Template

    Coordinates are denoted in (X,Y), drill size format starting from the center (0,0) location of the enclosure. Tayda drill template: https://drill.taydakits.com/box-designs/new?public_key=eDNzRDdtelpRYytab3hxbTU4MUhJdz09Cg== Hardware 125B enclosure Mono jacks Slim 2.1mm DC jack Standard 3PDT footswitch 5mm LED NOTE: Different 1/4” and DC jack styles may require different sized drill holes. Touchstone24 pg. 10...
  • Page 11 Build Pic Previous version build Touchstone24 pg. 11...
  • Page 12 Schematic Touchstone24 pg. 12...

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