HardLabs

OMSDR

HB9UF·OMSDR

OMSDR PCB layout, top view — open source AVR/Arduino board by HB9UF
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About the OMSDR PCB

OMSDR is an open source AVR/Arduino PCB design by HB9UF, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 50 × 50 mm, with 50 components from 29 distinct parts.

Its main chip is the ATtiny24-20SS, from the AVR/Arduino family. Other key parts include the LT6231, FST3253, LDK320ADU33R and Si5351A-B-GT. By type, the board carries 15 capacitors, 14 resistors, 6 connectors, 5 ICs, 4 diodes and 2 switches.

It belongs with the rf & radio designs in this gallery.

From the project

An SMD soldering practice kit for hams.

OMSDR is a simple HF SDR receiver frontend inspired by the SoftRock Lite II. It is designed as SMD soldering practice kit to demonstrate the power of SMD technology, meant as an entry point for amateur radio hobbyists who are afraid of SMD. To allow for an easy entrance, most components are fairly large -- much larger than what you usually use in SMD designs. Our position is that SMD soldering is not hard if you know the proper techniques, and that a kit such as this one makes it easy to acquire these techniques. Note that this is not a particular good radio, and if you are not in for the…

OMSDR, from the project README
From the project README

Main components on the OMSDR

LT6231FST3253LDK320ADU33RSi5351A-B-GTATtiny24-20SS

OMSDR bill of materials (BOM)

50 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LT6231
U1
1
FST3253
U2
1
LDK320ADU33R
U3
1
Si5351A-B-GT
U4
1
ATtiny24-20SS
U5
1
25 MHz
X1
1
I/Q Out
J1
1
ANT
J2
1
ISP
J3
1
LO
J4
1
I/Q Out
J5
1
IO
J8
1
LEFT
SW1
1
RIGHT
SW2
1
CX2074NL
T1
4
LED
D1, D2, D3, D4
1
4.7u
L1
1
0.56u
L2
6
0.1u
C1, C2, C3, C5, C11, C12
3
4.7u
C4, C14, C16
Show 9 more
QtyPartRefs
1
110p
C6
2
0.047u
C7, C9
1
680p
C8
2
390p
C10, C13
6
1k
R1, R2, R11, R12, R13, R14
2
100
R3, R8
2
49.9
R4, R9
2
10
R5, R6
2
4.99k
R7, R10

OMSDR design files

The KiCad project lives in the HB9UF/OMSDR repository on GitHub; these links point at the commit this page was built from.

OMSDR: common questions

What microcontroller does the OMSDR use?

The OMSDR is built around the ATtiny24-20SS, from the AVR/Arduino family.

How big is the OMSDR PCB?

The OMSDR measures 50 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OMSDR?

50 components, from 29 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the OMSDR design files?

From the HB9UF/OMSDR repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the OMSDR design in my own project?

Yes, under the terms of its GPL-3.0 license, which HB9UF chose for the repository.

Can I test firmware for the OMSDR 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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