Ton  Giesberts
About the article

Audio T-Board

With integrated loudspeaker

Audio T-Board
What do you think of a T-board with a small power amplifier and preferably also with a built-in speaker, so that you can make any audio signals audible immediately, without first having to build a separate circuit for this and then connecting some speakers to it?
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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: 0.1 W, 1%, SMD0603
R1 = 1k?
R2–R6 = 100k?
R7 = 22k?
R8,R10 = 10k?
R9 = 20k?
R11 = 390?
P1 = 10k?, 0.5W, 10% preset, Vishay Sfernice T73YU103KT20

C1,C2 = 1µF 25V, 10%, X7R, SMD 0805
C3,C6,C11,C12,C14 = 100nF 16V, 10%, X7R, SMD 0603
C4,C5 = 220nF 10V, 10%, X7R, SMD 0603
C7 = 10µF 6.3V, 20%, X5R, SMD 0603
C8,C9 = 1nF 50V, 5%, C0G/NP0, SMD 0603
C10 = 47µF 100V, 20%, bipolar, 13mm diam., 5mm pitch, Ir 240mA
C13 = 22µF 6.3V, 10%, X5R, SMD 1206
C15 = 10µF 25V, 10%, X5R, SMD 1206

L1,L2 = 1.3A 0.15?, 600? @ 100MHz, SMD 0603 (Murata BLM18KG601SN1D)
L3 = 3A 2x50 m?, 230? @ 100 MHz, SMD Common Mode Choke (ACM4520-231-2P-T)
L4 = 10µH 2.1A, screened, SMD (Laird TYS5040100M-10)

D1 = PESD5Z2.5, SMD SOD-523
D2,D3 = PMEG6030EP, SMD SOD-128
D4 = LED, low-current, green, 3mm, wired
IC3 = ADP2300AUJZ-R7, SMD UJ-6

K1,K2 = 4-pin pinheader with thin pins, 0.1” pitch, Harwin D01-9923246 (Newark/Farnell # 1022218)
K3 = supply connector 12V 3A, 1.95mm center pin
PC1,PC2 = PCB pin, 1.3mm diam.
JP1 = 2-pin pinheader, 0.1” pitch, with jumper
LS1 = loudspeaker, PCB mount, 31.9mm diam., 17.53mm pitch (RS-online/Avnet 7243119)
Alternative for LS1: Multicomp MCABS-201-RC (Newark/Farnell 2361100)
Alternative for LS1: Visaton 2823, K 23 PC - 8 Ohm (Newark/Farnell 2357167)
PCB # 150002-1
Alternatively, ready assembled board # 150002-91

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