SimpleModem
About the SimpleModem PCB
SimpleModem is an open source PCB design by AndersBNielsen, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 46.7 × 15.2 mm, with 34 components from 22 distinct parts.
Other key parts include the LM393. By type, the board carries 14 resistors, 12 capacitors, 4 jumpers, 2 connectors, 1 IC and 1 transistor.
From the project
Simple Universal Modem
Check out the project on https://hackaday.io/project/186309-simple-universal-modem Also check out the video demo: https://www.youtube.com/watch?v=k8hlYr6N3Ls
If you are looking for software to use with this, you should check out my 6502 Single Board Computer repo: https://github.com/AndersBNielsen/abn6502
TX: The component values are configured to expect a 1200/2400Hz FSK modulated square wave on the DataOut(DOut on the silkscreen) pin. This signal is band pass filtered to make a 1V peak to peak sine wave that is output on the ModOut pin.
Main components on the SimpleModem
SimpleModem bill of materials (BOM)
34 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM393 | DIP-8_W7.62mm | U1 |
| 1 | BC547 | TO-92_Inline | Q1 |
| 1 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J1 |
| 1 | TRRS jack | Jack_3.5mm_4Poles_5pins_SMD_ABN | J2 |
| 1 | T | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | R | PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | R/S | PinHeader_1x03_P2.54mm_Vertical | JP3 |
| 1 | S | PinHeader_1x03_P2.54mm_Vertical | JP4 |
| 5 | 100nF | C_0603_1608Metric | C1, C2, C8, C9, C10 |
| 4 | 470pf | C_0805_2012Metric | C3, C4, C5, C7 |
| 1 | 1nF | C_0805_2012Metric | C6 |
| 1 | 10uF | CP_Elec_4x5.3 | C11 |
| 1 | NC | C_0805_2012Metric | C12 |
| 5 | 47k | R_0805_2012Metric | R1, R4, R7, R9, R11 |
| 2 | 680k | R_0805_2012Metric | R2, R3 |
| 1 | 100k | R_0805_2012Metric | R5 |
| 1 | 120k | R_0805_2012Metric | R6 |
| 1 | 1M | R_0805_2012Metric | R8 |
| 1 | 2k2 | R_0805_2012Metric | R10 |
| 1 | 470k | R_0805_2012Metric | R12 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 6k8 | R_0805_2012Metric | R13 |
| 1 | NC | R_0805_2012Metric | R14 |
SimpleModem design files
The KiCad project lives in the AndersBNielsen/SimpleModem repository on GitHub; these links point at the commit this page was built from.
- LayoutSimpleModem.kicad_pcb
- SchematicSimpleModem.kicad_sch
SimpleModem: common questions
How big is the SimpleModem PCB?
The SimpleModem measures 46.7 × 15.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the SimpleModem?
34 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the SimpleModem design files?
From the AndersBNielsen/SimpleModem repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the SimpleModem design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.