HardLabs

Rtty transmitter

bazsimarkus·rtty-transmitter·schematic/rtty-transmitter.kicad_pcb

Rtty transmitter PCB layout, top view — open source AVR/Arduino board by bazsimarkus

About the Rtty transmitter PCB

Rtty transmitter is an open source AVR/Arduino PCB design by bazsimarkus, published on GitHub. It is a 2-layer board measuring 120 × 60 mm, with 71 components from 42 distinct parts.

Its main chip is the ATmega328P-P, from the AVR/Arduino family. Other key parts include the MCP2221AxP, MCP4901, 25LC1024 and MCP6022. By type, the board carries 24 resistors, 19 capacitors, 7 connectors, 6 diodes, 5 ICs and 4 test points.

It belongs with the audio, usb & debug tools and power & battery designs in this gallery.

From the project

An ATmega328P-based AM/RTTY transmitter card with USB serial control, Direct Digital Synthesis audio generation, PCM audio playback from SPI EEPROM, and a Wien bridge oscillator RF stage.

An ATmega328P-based AM/RTTY transmitter card with USB serial control, Direct Digital Synthesis audio generation, PCM audio playback from SPI EEPROM, and a Wien bridge oscillator RF stage. The board is controlled entirely through an AT command interface over a virtual COM port, and includes a companion Python control center application for Windows, Linux, and macOS.

Rtty transmitter, from the project README
From the project README

Main components on the Rtty transmitter

MCP2221AxPATmega328P-PMCP490125LC1024MCP6022

Rtty transmitter bill of materials (BOM)

71 components, 42 distinct parts.

QtyPartRefs
1
MCP2221AxP
U1
1
ATmega328P-P
U2
1
MCP4901
U3
1
25LC1024
U4
1
MCP6022
U5
2
PN2222A
Q1, Q2
1
16 MHz
Y1
1
USB Type B Connector
J1
1
USBasp header
J2
1
2x5 Pin Header Connector Female
J3
2
Conn_01x02_Pin
J4, J5
1
Conn_01x02_Pin
J6
1
SMA Vertical Female
J7
1
Button TACT 6x6mm
S1
1
Virtual Ground
TP1
1
GND
TP2
1
Carrier Wave
TP3
1
Buffered Audio
TP4
1
LED 5mm YELLOW
D1
1
LED 5mm GREEN
D2
Show 22 more
QtyPartRefs
1
LED 5mm RED
D3
1
LED 5mm WHITE
D4
2
1N4148
D5, D6
1
1mH
L1
1
330uH
L2
6
100nF
C1, C4, C8, C10, C14, C19
1
470nF
C2
5
10uF
C3, C7, C13, C16, C17
2
22pF
C5, C9
3
100pF
C6, C15, C18
1
10nF
C11
1
1nF
C12
10
10k
R1, R2, R8, R13, R15, R16, R18, R20 +2
4
470R
R3, R4, R5, R9
2
1k
R6, R12
1
22k
R7
1
220R
R10
1
100R
R11
2
1.5k
R14, R23
1
2.2k
R17
1
4.7k
R19
1
15k
R22

Rtty transmitter design files

The KiCad project lives in the bazsimarkus/rtty-transmitter repository on GitHub; these links point at the commit this page was built from.

Rtty transmitter: common questions

What microcontroller does the Rtty transmitter use?

The Rtty transmitter is built around the ATmega328P-P, from the AVR/Arduino family.

How big is the Rtty transmitter PCB?

The Rtty transmitter measures 120 × 60 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rtty transmitter?

71 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the Rtty transmitter design files?

From the bazsimarkus/rtty-transmitter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Rtty transmitter design in my own project?

The repository has no license, so all rights stay with bazsimarkus. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Rtty transmitter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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