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Morse Converter Shield

Arduino UNO understands dah-dit-dah

Morse Converter Shield
Morse is still alive and has its staunch supporters. Let’s see if Arduino can help us decode these mysterious beeper-di-beep signals.
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Extra info / Update
* Simple analog front end
* NE567 tone decoder
* Arduino Morse Decoder sketch
* Glitch fighting software
* Simple calibration to match Morse speed
* Single-sided PCB
* Zero-SMD design
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
Component List
Default: carbon film, 5%, 0.25W, 250V
R1 = 22k?
R2 = 820?
R3 = 27k?
R4 = 39k?
R5 = 56k?
R6,R7,R10,R14 = 4.7k?
R8,R11 = 10k?
R9 = 100k?
R12 = 680k?
R13 = 18k?
R15 = 330?
P1 = 10k?, preset, horizontal
P2 = 4.7k? (5k?), preset, horizontal

C1,C2 = 33nF
C3 = 100µF 50V, 3.5 mm pitch, 8x11 mm
C4,C5,C6 = 47nF 50V, X7R, 0.1’’ pitch
C7 = 1µF, 50 V, 2 mm pitch, 5x11 mm
C8 = 270nF 50V
C9 = 120nF 50V

IC1 = LM324, quad opamp
IC2 = LM567CN, tone decoder
D1,D2 = 1N4148
LED1 = red, 3mm

K1,K2,K3,K4 = cut from 40-pin SIL pinheader strip
K5 = stereo jack socket for 3.5 mm plug
DIP-8 IC socket
DIP-14 IC socket
Arduino UNO
PCB # 140086-1

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