TeensyPolySynth
About the TeensyPolySynth PCB
TeensyPolySynth is an open source NXP PCB design by ajharvie, published on GitHub. It is a 2-layer board measuring 355.6 × 97.8 mm, with 81 components from 65 distinct parts.
Its main chip is the TEENSY4.1, from the NXP family. Other key parts include the 74HC4051, 6N138 and TSR_1-2450. By type, the board carries 12 resistors, 10 switches, 8 ICs, 7 diodes, 6 jumpers and 5 transistors.
From the project
A digital polysynth based on the teensy 4.1
A digital polysynth based on the teensy 4.1
Code heavily adapted from Albert Nyström's 6-voice teensy synth: https://github.com/albnys/TeensyPoly6
I'll write up the new features and improvements at some point but I promise it's dead good
Main components on the TeensyPolySynth
TeensyPolySynth bill of materials (BOM)
81 components, 65 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 74HC4051 | DIP-16_W7.62mm | U2, U3, U4, U6 |
| 1 | 6N138 | DIP-8_W7.62mm | U5 |
| 1 | ~ | 1334ABreakout | U7 |
| 1 | TSR_1-2450 | Converter_DCDC_TRACO_TSR-1_THT | U8 |
| 1 | TEENSY4.1 Teensy4.1 | Teensy41 | U9 |
| 5 | 2N3904 | TO-92_Inline | Q1, Q2, Q3, Q4, Q5 |
| 1 | lineOutHeader | TerminalBlock_Phoenix_MPT-0,5-3-2.54_1x03_P2.54mm_Horizontal | J1 |
| 1 | midiHeader | TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J3 |
| 1 | powerHeader | TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J4 |
| 1 | WCLK3.6 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | WCLK4.1 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | DIN3.6 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP3 |
| 1 | DIN4.1 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP4 |
| 1 | BCLK3.6 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP5 |
| 1 | BCLK4.1 | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP6 |
| 1 | presetKnob | R0904N_newholes | RV3 |
| 1 | revMixKnob | R0904N_newholes | RV4 |
| 1 | revSizeKnob | R0904N_newholes | RV5 |
| 1 | dlyTimeKnob | R0904N_newholes | RV6 |
| 1 | dlyMixKnob | R0904N_newholes | RV7 |
Show 45 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | lfoBRateKnob | R0904N_newholes | RV8 |
| 1 | lfoBDepthKnob | R0904N_newholes | RV9 |
| 1 | volPot | alphaPot_Centred | RV10 |
| 1 | bendPot | alphaPot_Centred | RV11 |
| 1 | cWaveKnob | R0904N_newholes | RV12 |
| 1 | bTunePot | alphaPot_Centred | RV13 |
| 1 | cTunePot | alphaPot_Centred | RV14 |
| 1 | modKnob | R0904N_newholes | RV15 |
| 1 | subVolPot | alphaPot_Centred | RV16 |
| 1 | aVolPot | alphaPot_Centred | RV17 |
| 1 | bVolPot | alphaPot_Centred | RV18 |
| 1 | cVolPot | alphaPot_Centred | RV19 |
| 1 | filterFpot | alphaPot_Centred | RV20 |
| 1 | filterResPot | alphaPot_Centred | RV21 |
| 1 | fAttknob | R0904N_newholes | RV22 |
| 1 | fReleaseKnob | R0904N_newholes | RV23 |
| 1 | filterEnvAmtPot | alphaPot_Centred | RV24 |
| 1 | attPot | alphaPot_Centred | RV25 |
| 1 | decPot | alphaPot_Centred | RV26 |
| 1 | susPot | alphaPot_Centred | RV27 |
| 1 | lfoADepthPot | alphaPot_Centred | RV28 |
| 1 | lfoAFreqPot | alphaPot_Centred | RV29 |
| 1 | lfoADecKnob | R0904N_newholes | RV30 |
| 1 | lfoAAttKnob | R0904N_newholes | RV31 |
| 1 | shapeA | miniToggle | SW2 |
| 1 | shapeB | miniToggle | SW3 |
| 1 | mainOctave | miniToggle | SW4 |
| 1 | octB | miniToggle | SW5 |
| 1 | octC | miniToggle | SW6 |
| 1 | filterMode | miniToggle | SW7 |
| 1 | LFOdest | miniToggle | SW8 |
| 1 | LFOShape | miniToggle | SW9 |
| 1 | reset | pushButtonEuro | SW10 |
| 1 | save | pushButtonEuro | SW11 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 1N4001 | D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | LED1 | LED_D5.0mm_FlatTop | D3 |
| 1 | LED2 | LED_D5.0mm_FlatTop | D4 |
| 1 | LED3 | LED_D5.0mm_FlatTop | D5 |
| 1 | LED4 | LED_D5.0mm_FlatTop | D6 |
| 1 | LED5 | LED_D5.0mm_FlatTop | D7 |
| 1 | 1UF 1uF | C_Disc_D7.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 6 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R6, R8, R10, R12 |
| 5 | 10K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5, R7, R9, R11 |
TeensyPolySynth design files
The KiCad project lives in the ajharvie/TeensyPolySynth repository on GitHub; these links point at the commit this page was built from.
TeensyPolySynth: common questions
What microcontroller does the TeensyPolySynth use?
The TeensyPolySynth is built around the TEENSY4.1, from the NXP family.
How big is the TeensyPolySynth PCB?
The TeensyPolySynth measures 355.6 × 97.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the TeensyPolySynth?
81 components, from 65 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 TeensyPolySynth design files?
From the ajharvie/TeensyPolySynth 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 TeensyPolySynth design in my own project?
The repository has no license, so all rights stay with ajharvie. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the TeensyPolySynth without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
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