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PROJECT NAME
TERMINA
BASED ON
Timmy V2 / Vemuram Jan Ray
EFFECT TYPE
Overdrive
PROJECT SUMMARY
The original transparent overdrive, designed to bring out the best in the guitar and amplifier. Includes a
2-band tonestack for bass and treble control.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
TERMINA TRANSPARENT DRIVE
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
2.0.0 (2021-10-22)
1
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Table of Contents
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Summary of Contents for aion TERMINA
- Page 1 The original transparent overdrive, designed to bring out the best in the guitar and amplifier. Includes a 2-band tonestack for bass and treble control. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). TERMINA TRANSPARENT DRIVE...
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Page 2: Table Of Contents
720Hz mid-hump the Tube Screamer is known for. The Termina is more specifically based on the Timmy V2 with the clipping diode switch, which is the same version that was licensed to MXR for their Custom Shop mini version. The Timmy V3 “15th Anniversary”... -
Page 3: Parts List
Schottky diode, DO-41 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 LM1458N Operational amplifier, DIP8 Can substitute JRC4559D (NJM4559D). IC1-S DIP-8 socket IC socket, DIP-8 TERMINA TRANSPARENT DRIVE... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. TERMINA TRANSPARENT DRIVE...
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Page 5: Build Notes
The original Timmy has used both the JRC4559D and LM1458 throughout its production. Most V2’s used the 4559, while the V3 now uses the 1458. Use a socket and try both of them to see which one you like better. TERMINA TRANSPARENT DRIVE... -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 47uF 100n IC1A TREBLE IC1B LM1458 50kB LM1458 47pF 100pF BASS BASS TRIM 50kC 10kB 680R CLIP GAIN TERMINA TRANSPARENT DRIVE... -
Page 7: Drill Template
0.65, y: +1.71 ø9/32” ø9/32” CLIP x: 0, y: +1.06 VOLUME ø1/4” GAIN x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” TERMINA TRANSPARENT DRIVE... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B TERMINA TRANSPARENT DRIVE... -
Page 9: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. TERMINA TRANSPARENT DRIVE... -
Page 10: Document Revisions
DIY versions out on Reverb or eBay competing with the original Timmy. The Timmy is still in production and remains one of the most reasonably-priced handmade pedals out there, so please support the builder and buy one! DOCUMENT REVISIONS 1.0.0 (2021-10-22) Initial release. TERMINA TRANSPARENT DRIVE...
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