4 layers163 × 116.5 mm
4 layers108 × 79 mm
Alien Screamer
gehel/synth- Size
- 108 × 79 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 36
- Pads
- 166
- Tracks, vias
- 174, 1
- Pours
- 135
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 4 Oct 2023
- Updated
- 2 May 2026
Overview
Alien Screamer is an open-source printed circuit board by gehel, from the gehel/synth repository on GitHub. It is a 4-layer board of 108 × 79 mm with 63 parts on 36 nets, routed with 174 tracks and 1 via.
It is built around the LM324 and LM386. Its parts include 24 resistors, 15 capacitors, 3 transistors, 2 ICs and 2 diodes.
Main components
2Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R4, R9, R15, R19 |
| 4 | 10K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R17, R18, R22 |
| 4 | 4.7K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R6, R7, R20 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | SW_SPDT | Library:ToggleSwitch_MTS-102_SPDT | LFO_SHAPING1, LFO_SHAPING2, PWR1, SYNC1 |
| 3 | 100K | Library:Potentiometer_Bourns_PTV09A-1_Single_Vertical | LFO_Mod_Depth1, VCO_Freq1, Volume1 |
| 3 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C5, C6, C11 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C12, C13 |
| 2 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C4 |
| 2 | 1uF | Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm | C3, C10 |
| 2 | 2M | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13, R16 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_HandSolder | Q1, Q2 |
| 2 | 75K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R10 |
| 1 | 100pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C7 |
| 1 | 10R | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R24 |
| 1 | 10nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C8 |
| 1 | 15K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R23 |
| 1 | 1M | Library:Potentiometer_Bourns_PTV09A-1_Single_Vertical | LFO_Rate1 |
| 1 | 1N914 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 1 | 1nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C9 |
| 1 | 220K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
| 1 | 220uF | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C15 |
| 1 | 2K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11 |
| 1 | 2N5457 | Package_TO_SOT_THT:TO-92_HandSolder | Q3 |
| 1 | 300K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R21 |
| 1 | 3K | Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 470uF | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C2 |
| 1 | 47nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C14 |
| 1 | 9V Battery | Library:Battery holder 9v | BT1 |
| 1 | AudioJack2 | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | LED | LED_THT:LED_D3.0mm | D1 |
| 1 | LM324 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U1 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm_Socket_LongPads | U2 |
| 1 | LOGO | Library:WMF_Logo | G*** |
| 1 | Speaker | Library:Speaker 2030 | LS1 |
Questions
How big is the Alien Screamer PCB?
It measures 108 × 79 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Alien Screamer use?
63 parts, built around the LM324 and LM386. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Alien Screamer KiCad files?
From the gehel/synth repository on GitHub, at the commit this page was made from: the board is Alien Screamer/Alien Screamer/Alien Screamer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Alien Screamer design in my own project?
Its repository states no licence, so its author keeps all rights: ask gehel before reusing the design.
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