Twoshot
About the Twoshot PCB
Twoshot is an open source PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 70.8 × 128.5 mm, with 185 components from 35 distinct parts.
Other key parts include the ONESHOT, TL072, LM358 and L78L05_TO92. By type, the board carries 74 resistors, 33 capacitors, 28 diodes, 23 connectors, 15 ICs and 2 transistors.
It belongs with the audio designs in this gallery.
From the project
Mostly Eurorack projects
Twoshot is a dual one-shot waveform generator. The module uses a pair of Electric Druid ONESHOT Event Generator chips to generate interesting waveforms when triggered. Twoshot has a pleasingly large 30mm arcade button too.
On this, I've no idea - the module is currently in pieces! Nothing in it is particularly power-hungry, however there are a few bright LEDs in there to light up the button along with 24 opamps(!). At a guess, around 100mA +12v.
Main components on the Twoshot
Twoshot bill of materials (BOM)
185 components, 35 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | ONESHOT | DIP-8_W7.62mm_Socket_LongPads | U1, U2 |
| 10 | TL072 | SOIC-8_3.9x4.9mm_P1.27mm | U3, U4, U7, U8, U9, U11, U13, U14 +2 |
| 2 | LM358 | SOIC-8_3.9x4.9mm_P1.27mm | U5, U17 |
| 1 | L78L05_TO92 | TO-92_Inline_Wide | U10 |
| 2 | MMBT3904 | SOT-23 | Q1, Q2 |
| 2 | AudioJack2_SwitchT | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J1, J2 |
| 11 | AudioJack2 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J3, J4, J6, J7, J8, J9, J10, J12 +3 |
| 3 | Conn_02x05_Odd_Even | IDC-Header_2x05_P2.54mm_Vertical | J5, J16, J17 |
| 1 | Conn_02x01 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J11 |
| 1 | Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Vertical | J18 |
| 1 | Conn_02x05_Odd_Even | PinSocket_2x05_P2.54mm_Vertical | J19 |
| 1 | Conn_01x08_Male | PinHeader_1x08_P2.54mm_Vertical | J20 |
| 1 | Conn_01x08_Female | PinSocket_1x08_P2.54mm_Vertical | J21 |
| 1 | Conn_01x03_Male | PinHeader_1x03_P2.54mm_Vertical | J22 |
| 1 | Conn_01x03_Female | PinSocket_1x03_P2.54mm_Vertical | J23 |
| 8 | 10k | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 |
| 1 | SW_DIP_x02 | SW_DIP_SPSTx02_Slide_6.7x6.64mm_W7.62mm_P2.54mm_LowProfile | SW1 |
| 1 | SW_DPDT_x2 | 2MD6T1B5M2RE | SW2 |
| 4 | 1N4148W | D_SOD-123 | D1, D4, D26, D27 |
| 2 | D_Schottky | D_A-405_P7.62mm_Horizontal | D2, D3 |
Show 15 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | LED | LED_D3.0mm | D5, D6, D7, D8, D17, D28 |
| 16 | BAT42 | D_SOD-123 | D9, D10, D11, D12, D13, D14, D15, D16 +8 |
| 3 | 10u | CP_Radial_D5.0mm_P2.50mm | C1, C2, C21 |
| 25 | 100n | C_0603_1608Metric | C3, C4, C5, C6, C7, C8, C9, C10 +17 |
| 4 | 47n | C_0603_1608Metric | C11, C12, C17, C18 |
| 1 | 100n | C_Disc_D3.8mm_W2.6mm_P2.50mm | C22 |
| 8 | 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3, R5, R7, R43, R45, R47, R49 |
| 8 | 200k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R4, R6, R8, R44, R46, R48, R50 |
| 4 | 9.1k | R_0603_1608Metric | R9, R10, R13, R14 |
| 6 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R12, R30, R55, R57, R74 |
| 9 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R15, R16, R19, R22, R23, R25, R69, R70 +1 |
| 5 | 1k | R_0603_1608Metric | R17, R18, R20, R21, R24 |
| 24 | 100k | R_0603_1608Metric | R26, R27, R28, R29, R31, R32, R33, R34 +16 |
| 8 | 4.7k | R_0603_1608Metric | R39, R40, R41, R42, R65, R66, R67, R68 |
| 2 | 10k | R_0603_1608Metric | R71, R72 |
Twoshot design files
The KiCad project lives in the tpcarlson/synth-diy repository on GitHub; these links point at the commit this page was built from.
- Layouttwoshot/twoshot.kicad_pcb
- Schematictwoshot/twoshot.kicad_sch
Twoshot: common questions
How big is the Twoshot PCB?
The Twoshot measures 70.8 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Twoshot?
185 components, from 35 distinct parts. The full bill of materials is listed on this page.
Where can I download the Twoshot design files?
From the tpcarlson/synth-diy repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Twoshot design in my own project?
The repository has no license, so all rights stay with tpcarlson. Use it as a reference, and ask the author before reusing the design.
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