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
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 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...
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...
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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...
• 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...
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...
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Build Pic Previous version build Touchstone24 pg. 11...
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