Akashic Guitar effects circuit lookup
RATEDEPTH

1590B · 2 knobs

Tagboard Effects

EHX Small CloneVerified

Based on the Electro-Harmonix Small Clone· 7 other boards clone it

Controls
Rate · Depth
Build
Vero· 21×28· 41 cuts, 22 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Chorus, Electro Harmonix

From the post

Modded to include a depth pot instead of the switch used in the original, giving you variable depth control rather than just two preset levels. Not the best looking layout with too many links and cuts, but it's a means to an end, and it's hard to avoid when you have 4 ICs, 3 transistors and lots of interconnections, so I'm just happy that I managed to keep the size down. 21 x 28 will be a squeeze to get in a 1590B, but with only two pots and no other switches it shouldn't be a problem for most people.

I didn't have enough room to fit in pulldown resistors on the input and output and can't bring myself to add extra columns just to do that, so if you get any popping just add them to the stomp switch, 1M between input board wire lug and ground lug, and 100K between output board wire lug and ground lug. I may actually do it with surface mount resistors on the copper side of the board (the entire second row is ground).

Anyway, you all know what it is so no need to describe further. Manufacturers info about the great sounding, and very well priced original.

The classic chorus! Analog chorus pedal popularized by Kurt Cobain. The finest analog chorus sounds: from clear, rich and dimensional to warm pulsating warbles, can be intensified with the Depth Control. Simple tweaks generate exciting doubling effects. Chiming 12-string tone, or Leslie-like warbles.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 44 rows

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RefValueNormalizedTypeNotes
Resistors 18
×610K10kread from the layout by eye
×439K39kread from the layout by eye
×333K33kread from the layout by eye
×21K1kread from the layout by eye
×26K86.8kread from the layout by eye
×2220K220kread from the layout by eye
×256K56kread from the layout by eye
×122K22kread from the layout by eye
×120K20kread from the layout by eye
×13K33.3kread from the layout by eye
×112K12kread from the layout by eye
×147K47kread from the layout by eye
×1470K470kread from the layout by eye
×1120K120kread from the layout by eye
×182K82kread from the layout by eye
×168K68kread from the layout by eye
×12K22.2kread from the layout by eye
×1180K180kread from the layout by eye
Capacitors 14
×1150p150pread from the layout by eye
×1180p180pread from the layout by eye
×1470p470pread from the layout by eye
×12n72.7nread from the layout by eye
×13n33.3nread from the layout by eye
×14n74.7nread from the layout by eye
×210n10nread from the layout by eye
×115n15nread from the layout by eye
×133n33nread from the layout by eye
×147n47nread from the layout by eye
×31u1uread from the layout by eye
×12u22.2uelectrolytic; read from the layout by eye
×410u10uelectrolytic; read from the layout by eye
×1220u220uelectrolytic; read from the layout by eye
Diodes 2
D11N41481N4148read from the layout by eye
D21N41481N4148read from the layout by eye
Transistors 3
Q12N50872N5087read from the layout by eye
Q22N50882N5088read from the layout by eye
Q32N50882N5088read from the layout by eye
ICs 4
IC1JRC4558JRC4558read from the layout by eye
IC2MN3007MN3007read from the layout by eye
IC3CD4047BECD4047BEread from the layout by eye
IC4LM358LM358read from the layout by eye
Potentiometers 2
RateC1MC1MPotentiometerRev Log; read from the layout by eye
DepthB10KB10kPotentiometerread from the layout by eye
Trimmers 1
×1100K100kread from the layout by eye

Other boards based on the Electro-Harmonix Small Clone