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This compares to the popular Small Clone
commercial pedal on which this is based is the addition of a depth knob, which provides more flexibility than the original commercial
pedal, which only had a depth selector switch. Even better the circuit is isolated into two parts, e ach separately grounded f or the
sole purpose of noise free operation compared to similar offerings. This requires you to connect both ground pads labeled: GND and
G2.
Board Dimensions (W x H) 2.08 x 2.32 inches, i.e.: 54 x 59mm. We recommend a 125B enclosure or larger for beginners.
IMPORTANT NOTES
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This board has 2 separate ground planes to prevent audible clock noise. B oth ground planes need to be connected ,
preferably to the main source ground (especially for G2). Please make sure that pads GND and G2 are both grounded.
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The MN3007 IC is no longer produced. eBay has many international sellers of these chips also. There has been some debate
over whether these IC's are "genuine Motorola" or knock-offs. We recommend you purchase from Small Bear USA and
remind you that if you purchase from eBay, proceed (at your own risk) with caution as they are now heavily counterfeited..
GuitarPCB.com does not endorse any eBay or Asian sellers or make any guarantee that you'll get working IC's from them.
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Please note that the CoolAudio 3207 IC has slightly different voltage requirements and is incompatible with this board.
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This board has 16mm PCB-mounted potentiometers, which mount to the underside of the board. We highly recommend
that you mount the pots in your drilled enclosure, and then fit the board onto the pots, and solder them together.
Absolutely do not solder the pots to the board and then force the pots into the holes, or you may break the circuit board. If
you prefer, you may also use wired pots and arrange them knobs in your enclosure to suit your personal preferences.
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The trimmer potentiometer is for biasing the output of IC1A and should be adjusted by ear until the chorus effect is most
pronounced. On our builds, this was a little to the left of center.
GuitarPCB.com
Mini-Me Chorus Build Instructions
TM
chorus, but includes modifications.
The major difference between this circuit and the
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Table of Contents
Summary of Contents for GuitarPCB Mini-Me
- Page 1 (at your own risk) with caution as they are now heavily counterfeited.. GuitarPCB.com does not endorse any eBay or Asian sellers or make any guarantee that you’ll get working IC’s from them.
- Page 2 PART LIST Part Value Part Value Part Value 1n914 1n914 100k 220k 120k 470p 470k 180k 180p 470n 470n 47 ohm 220u 1k8 (CLR) 4558 MN3007 150p CD4047 LM358N 2N5087 220k 2N5088 DEPTH: B10k 2N5088 RATE: C1M 100k (see text) Bi-Color CA LED (see text)
- Page 3 STATUS LED D3 is a common anode bi-color LED. The diagram at right shows the pin-out, schematic symbol and pad connection for a common anode LED. The pin-out for the bi-color LED is typically (but not always) as follows:The lead 1 pad on the circuit board is marked with a white box. When connected correctly, the LED will light red when power is applied and the circuit is in bypass mode.
- Page 4 When printed, the border of the board should measure 2.08 x 2.32 inches, i.e.: 54 x 59mm. Note: Only Drill the LED hole shown above if you plan to use the status LED on the Mini-Me circuit board! This drawing shows the spacing between centers of the pots, and the distance of the LED pads from the center of the pots. Hole diameters are not exact in this image, so please measure your components before selecting a drill bit.
- Page 5 If they do not have a KIT listed send them a note asking if they can help you out. This document, PCB Artwork and Schematic Artwork © GuitarPCB.com. Schematic, PCB and this document by Bruce R. and Barry. All copyrights, trademarks, and artworks remain the property of their owners.Distribution of this document is prohibited without written consent from GuitarPCB.com.
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