Ramkumar Ramaswamy
About the article

ADAU1701 Universal Audio DSP Board

drag ‘n drop DSP’ing—and no SMDs to solder

Based on a Labs project | April 2013 | Find it here
ADAU1701 Universal Audio DSP Board
It seems that to even dip your feet in the ocean of DSP (digital signal processing) you need lots of SMD soldering skills and a ton of math. Seems. Let’s end the anxiety: here is a Universal Audio DSP board for the DIYer. Based on the Analog Devices ADAU1701 DSP, this board has only through-hole components—except for the DSP itself, which Elektor PCB Service reflow-solder in place especially 4 U.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.
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Component list


(all fixed Rs 5%, .25W)

R1,R18 = 100Ohm

R15 = 330Ohm

R4,R10,R11,R12,R13 = 470Ohm

R21,R22,R23,R24 = 560Ohm

R2 = 1kOhm

R3,R5,R14 = 2.2kOhm

R25,R26 = 10kOhm

R16,R19,R20 = 18kOhm

R17 = 47kOhm

R6,R7,R8,R9 = 1MOhm

P1,P2,P3,P4 = 10kOhm potentiometer, linear law

P5 = 470Ohm preset (trimmer)


C1,C2 = 22pF

C4 = 3.3nF

C24,C26,C28,C30 = 5.6nF

C6 = 56nF

C3,C8,C9,C10,C11,C12,C14,C15,C21,C22,C32,C34,C36 = 100nF

C5,C7,C13,C16,C33,C35 = 10µF 16V, radial, 2.5mm pitch

C23,C31 = 47µF 25V, radial, 2.5mm pitch

C17,C18,C19,C20 = 100µF 16V, 2.5mm


D1,D2,D3 = 1N5817

D4,D5,D6,D7 = BZX79-C3V3 3.3V zener diode

IC1 = 24LC256-I/P, DIL8 case

IC2 = MCP604-I/P, MCP6004, DIL14 case

IC3 = ADAU1701JSTZ (LQFP48 case)

IC4 = TS2940CZ-3.3

LED1 = LED, 3mm

T1 = BC327



K3,K4,K5,K6,K7,K8 = RCA/cinch socket, PCB mount

K1 = DC power adaptor connector

S1 = pushbutton w. tactile feedback

X1 = 12.288MHz quartz crystal

JP1 = 2-pin pinheader, 0.1’’ pitch

K10 = 4-way pin header, 0.1’’ pitch

K9 = 5-way pin header, 0.1’’ pitch

K11 = 14-way pin header, 0.1’’ pitch

K12 = 7-way pin header, 0.1’’ pitch


PCB, Elektor Store # 130232-1, comes with ADAU1701JSTZ presoldered

Semi-kit, Elektor Store # 130232-71, includes PCB 130232-1 and all through-hole parts

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