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Guitar Overdrive

With genuine 'germanium-sound'

Guitar Overdrive
The project described here is an effects device for a guitar, where the distortion effects are generated with the aid of paired silicon and germanium diodes. Very beautiful sound effects are generated because the diodes are driven by controlled current sources (OTAs).
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component List
Default: SMD1206, 0.25W 1%
R1,R3,R5,R21,R22,R35,R36,R38,R43,R47,R48,R50,R58 = 10kOhm
R2,R53,R54 = 1MOhm
R4,R56 = 100kOhm
R6,R37,R39,R40,R41,R49 = 22kOhm
R7,R8 = 68kOhm
R9,R10,R14,R15,R30,R31 = 220Ohm
R11,R17 = 150kOhm
R12,R16 = 330kOhm
R13,R18 = 47kOhm
R19,R20,R34,R42 = 4.7kOhm
R23,R28,R45 = 2.2kOhm
R24 = 560Ohm
R25,R26,R44,R46 = 6.8kOhm
R27 = 15kOhm
R29 = 1kOhm
R32,R33 = 2.2MOhm
R51,R52 = not fitted
R55 = 0Ohm
R57 = 100Ohm
P1,P4 = 50kOhm linear potentiometer, 5mm pitch
P2 = 50kOhm stereo, linear potentiometer, 5mm pitch
P3 = 10kOhm stereo, linear potentiometer, 5mm pitch
P5,P6 = 10kOhm trimpot, 0.1” pitch, Vishay Sfernice T73YP103KT20
P7,P8 = 100kOhm trimpot, 0.1” pitch, Bourns 3362P-1-104LF
C1,C5,C9,C10,C11,C13,C14,C20 = 220nF 50V, 10%, X7R, SMD1206
C2 = 2.2µF 100V, 20%, 2.5mm pitch, diam. 6.3 mm max.
C3 = 470pF 50V, 10%, X7R, SMD1206
C4 = 10nF 50V, 10%, X7R, SMD1206
C6,C18 = 10µF 100V, 20%, 2.5mm pitch, diam. 6.3 mm max.
C7 = 47µF 35V, 20%, 2.5mm pitch, diam. 6,3 mm max.
C8,C12,C15,C21 = 100nF 50V, 10%, X7R, SMD1206
C16 = 2.2nF 50V, 10%, X7R, SMD1206
C17,C19 = 47nF 50V, 10%, X7R, SMD1206
D1,D2 = OA90, alternatively, D9B/OA191/MD276/D311/1N60/OA1161
D3,D4 = 1N914A, DO-35
D5 = BZX79-C2V4, DO-35
LED1 = LED, red, 3mm, wired
T1 = BF545A (SMD SOT-23)
IC2 = LM385Z-2.5 (TO-92)
IC3 = LM13700M/NOPB (SMD SOIC-16)
IC5 = TLC274CD (SMD SOIC-14)
K1,K2,K3 = 2-way PCB screw terminal block, 0.2” pitch
JP1,JP2,LED1 = 2-pin pinheader, 0.1” pitch
S1,S2 = foot switch, 3 C/O contacts (3PDT), PCB mount, 4 x 5 mm pitch (www.UK-electronic.de, no. 102-000 with solder eyes, or 102-000-1 with solder pins)
Clip with wires for 9-V battery
¼” (6.3mm) mono jack connector, panel mount
F1 = 50 mA Multifuse, radial (Bourns MF-R005-0)
PCB # 130311-1 [2]

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