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Schematics and PCB layout for a spring reverb driver in Kosmo modular format

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Kosmo Spring Reverb Driver

This repository contains KiCad schematics and PCB layout for a spring reverb driver in Kosmo modular synthesizer format. It is capable to drive reverbs with an impedance from 8 to 600 ohms. There is a short video at https://www.youtube.com/watch?v=zHZOu3KcKBQ.

Kosmo Reverb Driver PCB

Schematics

Kosmo Reverb Driver Schematics

Building

Just put everything in, all values are marked on the PCB. Start with the lowest profile. The board is also the front panel of the module so components stick out. It is also possible to solder most of the components on the back if wanted.

You need a separate spring reverb tank for this module. Marked component values need to be changed depending on your reverbs impedance. The values written on the board are for 8 ohm impedance. I drive an Accutronics 4AB2A1C with it. You need to make sure that the input coil is not grounded to the tanks casing or it won't work.

Coil impedance

Input Coil Impedance R5, R13, R19 R10 R6, R7 C2, C3
8R 100R 150R 4k7 100uF
150R 470R 3k3 6k8 22uF
200R 560R 3k9 6k8 22uF
250R 680R 5k6 6k8 22uF
600R 1k 12k 6k8 22uF

I only tested values for 8 ohm impedance coils. You might need to fiddle around with listed values for good results.

BOM

Designator Quantity Designation
C3,C2 2 100u*
R19,R13,R5 3 100*
GAIN1 1 100k trimpot 5mm
R18 1 1k
REVERB_OUT1,REVERB_IN1 2 2 pin connector
C9,C8 2 22u
C7,C6 2 10u
POWER1 1 IDC 10 pin male connector
C11,C1 2 100n
C10 1 1n
C5 1 22n
OUT1,IN1 2 Audio Jack 6,35mm
FEEDBACK_POT1 1 50k pot
DRY_WET_POT1 1 10k pot
U1 1 TL074
R17,R16,R3,R2,R1 5 100k
R15,R14,R9,R8 4 10
R12 1 220
R11 1 2k2
R10 1 150*
R7,R6 2 4k7*
R4 1 10k
Q2 1 BC640
Q1 1 BC639
D2,D1 2 1N4148

References

https://sound-au.com/articles/reverb.htm

https://kassu2000.blogspot.com/2015/10/spring-reverb.html

https://www.lookmumnocomputer.com/modular

https://github.com/telec16/kicad

https://github.com/holmesrichards/Kosmo_panel

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Schematics and PCB layout for a spring reverb driver in Kosmo modular format

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