SWAH Vn R1 10k R13 4k7 R25 4k7 C5 22n 63V Q1 2N5457 R2 1M R14 6k8 R26 6k8 C6 1μ 16V Q2 BC550 R3 1M R15 1k R27 7k9 C7 68n 63V Q3 BC550 R4 10k R16 100k R28 100R C8 8n2 63V R5 5k1 R17 22k R29 47k C9 1μ 16V D1-D2 1N4148 R6 330R R18 22k R30 47k C10 100μ 16V D3 1N34 R7 330R R19 22k R31 3k3 C11 100n 63V D4-D5 1N4001 R8 6k8 R20 22k C12 100n 63V D6 CA Bi-colour LED R9 4k7 R21 10k C1 22n 63V P1 50k Lin R10 6k8 R22 4M7 C2 220n 63V IC1 LM13700 P2 100k Lin R11 330R R23 4M7 C3 1μ 16V IC2 TL074 P3 1M Rev Log R12 330R R24 330R C4 22n 63V IC3 78L05 TR1 50k
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SWAH Vn
R1 10k R13 4k7 R25 4k7 C5 22n 63V Q1 2N5457
R2 1M R14 6k8 R26 6k8 C6 1µ 16V Q2 BC550
R3 1M R15 1k R27 7k9 C7 68n 63V Q3 BC550
R4 10k R16 100k R28 100R C8 8n2 63V
R5 5k1 R17 22k R29 47k C9 1µ 16V D1-D2 1N4148
R6 330R R18 22k R30 47k C10 100µ 16V D3 1N34
R7 330R R19 22k R31 3k3 C11 100n 63V D4-D5 1N4001
R8 6k8 R20 22k C12 100n 63V D6 CA Bi-colour LED
R9 4k7 R21 10k C1 22n 63V P1 50k Lin
R10 6k8 R22 4M7 C2 220n 63V IC1 LM13700 P2 100k Lin
R11 330R R23 4M7 C3 1µ 16V IC2 TL074 P3 1M Rev Log
R12 330R R24 330R C4 22n 63V IC3 78L05 TR1 50k
STATUS LED D6 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:
1st Color Cathode Is on the “flat” side of the LED (see graphic); 90 degree bend in the lead
Common Anode Middle lead
2nd Color Cathode 45 degree bend in the lead
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. The LED will light green when in effects mode. If you
wish to use a standard LED, connect the anode to the middle pad and the cathode to the right pad to show the circuit in effects mode. If you
use a 3PDT wiring board that includes an LED, you can omit this LED and R31. *R31 is the LED’s Current Limiting Resistor (CLR). If you
use a different LED, you may want to change this value to adjust LED brightness.
If you are using one of GuitarPCB’s handy 3PDT wiring boards, pads S4, S5, S6 and D8 would be ignored and R31 would not be installed. See wiring guide below for reference.
IC’s are easily damaged by heat from soldering and should never be directly soldered to the PCB.
For transistors, diodes, and LED’s, use SIP (Single inline package) sockets. You simply cut the number of sockets required with an Exacto / Stanley knife or
by gripping and rocking with pliers.
This allows for easy changes and troubleshooting.
WIRING
This document, PCB Artwork and Schematic Artwork © GuitarPCB.com. Schematic, PCB and this document by Bruce R. and Barry S. All copyrights, trademarks, and artworks remain the property of their owners. Distribution of this document is prohibited without written consent from GuitarPCB.com. GuitarPCB.com claims no rights or affiliation to those names or owners.
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