Aion TERMINA Bedienungsanleitung

TERMINA TRANSPARENT DRIVE 1

PROJECT NAME

TERMINA

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Timmy V2 / Vemuram Jan Ray

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.

Overdrive 2.0.0 (2021-10-22)

BUILD DIFFICULTY

Easy

Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board).

TERMINA TRANSPARENT DRIVE 2

TABLE OF CONTENTS

1Project Overview 7Drill Template

2Introduction & Usage 8Enclosure Layout

3-4 Parts List 9Wiring Diagram

5Build Notes 10 Licensing

6Schematic 10 Document Revisions

INTRODUCTION

The Termina Transparent Drive is based on the Timmy overdrive pedal from Paul Cochrane, with some

modifications adapted from the Vemuram Jan Ray.

The Timmy was originally released in 2004 and is generally credited for kicking off the “transparent

overdrive” genre of pedals. It does have a two-band tone control, but generally speaking it’s not

designed to have much character of its own, instead bringing out the best qualities of the guitar and

amplifier. While it has some similarities to a stripped-down Tube Screamer, there is no trace of the

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” edition was released in 2019, moving the diode selector inside the pedal and repurposing

the toggle switch as a gain boost.

The Timmy has undergone several circuit changes throughout its run, so there is no single definitive

schematic. This excellent research article from ManticoreFX tracks all the known differences, with

several collected posts from Paul explaining the changes. The Termina project incorporates all of the

revisions prior to the V3 overhaul, while reversing the travel of the bass and treble knobs so they

increase the frequencies as they’re turned up instead of cutting as on the V2.

Please see page 10 for revised licensing terms, which are different from our normal projects. The

original Timmy pedal remains one of the best deals in the industry and we want to encourage as many

people as possible to buy the original if they are able.

USAGE

The Termina has four controls and one toggle switch:

• Drive controls the amount of gain from the op-amp stage that is clipped by the diodes.

• Bass allows adjustment of the pre-clipping bass response of the circuit.

• Treble allows adjustment of the post-clipping treble response of the circuit.

• Level sets the overall output of the effect.

• Clipping selects between three different sets of clipping diodes.

TERMINA TRANSPARENT DRIVE 3

PARTS LIST

This parts list is also available in a spreadsheet format which can be imported directly into Mouser for

easy parts ordering. Mouser doesn’t carry all the parts—notably potentiometers—so the second tab lists

all the non-Mouser parts as well as sources for each.

View parts list spreadsheet →

PART VALUE TYPE NOTES

R1 510k Metal film resistor, 1/4W

R2 3k3 Metal film resistor, 1/4W

R3 9k1 Metal film resistor, 1/4W Use 3k3 if omitting the bass trimmer mod.

R4 680R Metal film resistor, 1/4W Part of the bass trimmer mod. See build notes.

R5 1k Metal film resistor, 1/4W

R6 10k Metal film resistor, 1/4W

R7 10k Metal film resistor, 1/4W

R8 18k Metal film resistor, 1/4W

R9 8k2 Metal film resistor, 1/4W

R10 10k Metal film resistor, 1/4W

R11 100R Metal film resistor, 1/4W

RPD 2M2 Metal film resistor, 1/4W Input pulldown resistor.

LEDR 4k7 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.

C1 39n Film capacitor, 7.2 x 2.5mm

C2 47pF MLCC capacitor, NP0/C0G

C3 100pF MLCC capacitor, NP0/C0G

C4 39n Film capacitor, 7.2 x 2.5mm

C5 1uF Film capacitor, 7.2 x 3.5mm

C6 10n Film capacitor, 7.2 x 2.5mm

C7 2n2 Film capacitor, 7.2 x 2.5mm

C8 1uF Film capacitor, 7.2 x 3.5mm

C9 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C10 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

C11 100n MLCC capacitor, X7R Power supply filter capacitor.

D1 1N5817 Schottky diode, DO-41

D2 1N914 Fast-switching diode, DO-35

D3 1N914 Fast-switching diode, DO-35

D4 1N914 Fast-switching diode, DO-35

D5 1N914 Fast-switching diode, DO-35

D6 1N914 Fast-switching diode, DO-35

IC1 LM1458N Operational amplifier, DIP8 Can substitute JRC4559D (NJM4559D).

IC1-S DIP-8 socket IC socket, DIP-8

TERMINA TRANSPARENT DRIVE 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

BASS TRIM 10k trimmer Trimmer, 10%, 1/4” Part of the bass trimmer mod. See build notes.

GAIN 1MA 16mm right-angle PCB mount pot

BASS 50kC 16mm right-angle PCB mount pot

TREBLE 50kB 16mm right-angle PCB mount pot

VOLUME 25kA 16mm right-angle PCB mount pot

CLIP SPDT cntr off Toggle switch, SPDT center off

LED 5mm LED, 5mm, red diffused

IN 1/4" stereo 1/4" phone jack, closed frame Switchcraft 112BX or equivalent.

OUT 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.

DC 2.1mm 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.

FSW 3PDT Stomp switch, 3PDT

ENC 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1.

TERMINA TRANSPARENT DRIVE 5

BUILD NOTES

Bass trimmer

This trimmer, along with R3 and R4, sets the frequency and gain ratio of the op-amp clipping stage. It

impacts both filters, including the range of the Bass knob.

Set it to about 45% rotation for the stock Timmy circuit (4.5k + 0.68k || 9.1k = 3.3k). Or, if you don’t care

to use this trimmer at all, you can use 3.3k for R3 and omit R4 and the trimmer entirely.

IC selection

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.

SCHEMATIC

TERMINA TRANSPARENT DRIVE 6

GND

2M2

1N5817

100uF

1MA

50kB

GND

50kC

25kA

+9V

100n

39n

510k

8k2

10k

GND

47uF

GND

47pF

GND

LM1458

GND

100R

100pF

3k3

9k1

680R

10kB

39n

1uF

10n

GND

2n2

10k10k

1uF

18k

GND

OUT

RPD

C10

GAIN

TREBLE

BASS

VOLUME

C11

R10

C2 2

IC1A

IC1B

R11

D2 D3

D4D5

CLIP

BASS TRIM

R6R7

GND

TERMINA TRANSPARENT DRIVE 7

DRILL TEMPLATE

Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended

to first use a center punch for each of the holes to help guide the drill bit.

Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring

the scale on the printed page.

Top jack layout assumes the use of closed-frame jacks like the Switchcraft 111X. If you’d rather use

open-frame jacks, please refer to the Open-Frame Jack Drill Template for the top side.

LED hole drill size assumes the use of a 5mm LED bezel, available from several parts suppliers. Adjust

size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.

x: 0, y: -1.20

ø15/32”

x: -0.775, y: -1.20

ø5/16”

CENTER (0,0)

ø3/8” ø1/2”

0.385”

0.625” 0.625”

ø3/8”

OUT DC IN

125B

TREBLE BASS

VOLUME GAIN

FOOTSWITCHLED

CLIP

x: 0, y: +1.06

ø1/4”

x: -0.65, y: +1.71 x: 0.65, y: +1.71

ø9/32” ø9/32”

x: -0.65, y: +0.41

ø9/32”

x: 0.65, y: +0.41

ø9/32”

0 1 2

0 1

INCH

TERMINA TRANSPARENT DRIVE 8

ENCLOSURE LAYOUT

Enclosure is shown without jacks. See next page for jack layout and wiring.

125B

TERMINA TRANSPARENT DRIVE 9

WIRING DIAGRAM

125B

IN +VGND N.C. N.C. OUT

PCB

GND +V +V JACK GND JACK

OUTIN

GND GND PCB

OUT

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 10

LICENSE & USAGE

No direct support is offered for these projects beyond the provided documentation. It’s assumed

that you have at least some experience building pedals before starting one of these. Replacements and

refunds cannotbe offered unless it can be shown that the circuit or documentation are in error.

All of these circuits have been tested in good faith in their base configurations. However, not all the

modifications or variations have necessarily been tested. These are offered only as suggestions based

on the experience and opinions of others.

This project is for personal use only and cannot be used for commercial endeavors in any quantity. You

can still sell your own personal builds if you no longer want them, but generally speaking, we don’t want

these 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.

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