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TERMINA TRANSPARENT DRIVE

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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).

Summary of Contents for TERMINA

Page 1: ...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 ...

Page 2: ...sed 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 t...

Page 3: ... 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 capa...

Page 4: ... 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 ...

Page 5: ...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 lik...

Page 6: ...7uF GND 47pF GND LM1458 LM1458 VA GND 100R 100pF 3k3 9k1 680R 10kB 39n VB 1uF VB 1k 10n GND 2n2 10k 10k VB 1uF 18k GND IN OUT RPD D1 C10 1 2 3 GAIN TREBLE 1 2 3 BASS 1 2 3 VOLUME 1 2 3 C11 C1 R1 R9 R10 C9 C2 2 3 1 IC1A 6 5 7 IC1B 8 4 R11 C3 D2 D3 D4 D5 D6 CLIP 2 3 1 R2 R3 R4 BASS TRIM 1 2 3 C4 C5 R5 C6 C7 R6 R7 C8 R8 GND ...

Page 7: ...ame 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 ø...

Page 8: ...TERMINA TRANSPARENT DRIVE 8 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 125B ...

Page 9: ...AGRAM 125B IN V GND N C N C OUT PCB IN GND V V JACK GND JACK OUT IN 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 ...

Page 10: ...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 com...

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