Micromodem
About the Micromodem PCB
Micromodem is an open source PCB design by kareiva, published on GitHub. It is a 2-layer board measuring 20.4 × 68.1 mm, with 19 components from 14 distinct parts.
By type, the board carries 12 resistors, 3 capacitors, 2 LEDs and 1 transistor.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
MicroModem-compatible PCB shield for Arduino Nano by LY2EN
PCB and schematics for a very basic MicroModem shield for Arduino Nano to use with Baofeng radios.
This is experimental work. The authors do not hold any responsibility for any damage to your electronics components, wiring or other property when using this prototype. Use at your own risk.
1. Upload the MicroAPRS 3v KISS firmware to the Arduino Nano:
avrdude -p m328p -c arduino -P /dev/ttyUSB0 -b 115200 -U flash:w:microaprs-3v-kiss-latest.hex
Micromodem bill of materials (BOM)
19 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 2N7000 | TO-92_Inline | Q1 |
| 1 | BT_MOD | PinSocket_1x05_P2.54mm_Vertical | Conn_01x5 |
| 2 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | RX1, TX1 |
| 1 | 100NF 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 4.7UF 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 1UF 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 3 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R6, R16 |
| 1 | 2K2 2k2 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 3K9 3k9 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 8K2 8k2 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 47K 47k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 2 | 270 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8 |
| 1 | 10K 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 2 | 100K 100k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11 |
Micromodem design files
The KiCad project lives in the kareiva/micromodem-pcb repository on GitHub; these links point at the commit this page was built from.
Micromodem: common questions
How big is the Micromodem PCB?
The Micromodem measures 20.4 × 68.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Micromodem?
19 components, from 14 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 Micromodem design files?
From the kareiva/micromodem-pcb 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 Micromodem design in my own project?
The repository has no license, so all rights stay with kareiva. Use it as a reference, and ask the author before reusing the design.
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