2 layers50 × 100 mm
2 layers50 × 100 mm
ASDR - Old
PancakeLegend/HackSynth2A modular synth project
- Size
- 50 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 43
- Nets
- 33
- Pads
- 121
- Tracks, vias
- 169, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Apr 2025
- Updated
- 31 Mar 2026
Overview
ASDR - Old is an open-source printed circuit board by PancakeLegend, from the PancakeLegend/HackSynth repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 50 × 100 mm with 43 parts on 33 nets, routed with 169 tracks and 0 vias.
It is built around the TL072, BC550 and BC547. Its parts include 13 resistors, 5 diodes, 5 connectors, 4 capacitors and 4 transistors.
Main components
3
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
BC550
TO-92-31 NPN 100mA 110 15nA 300MHz 45V 500mW 600mV 6V NPN Standalone TO-92-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
README
README.mdHackSynth
A MODULAR SYNTH PROJECT
PROJECT ORIGIN STORY
- WE DISCOVERED A VERY AWESOME BREADBOARD SYNTH PROJECT CALLED BS-1, BY SOMEONE CALLED MAXWELL BECK.
- WE DECIDED TO CREATE A MODULAR SYNTH BASED ON THIS PROJECT, BUT DESIGN PCBS RATHER THAN USING BREADBOARDS FOR EACH MODULE
WHAT IS THE PURPOSE OF THIS PROJECT?
WHAT'S THE VISION?
- A LOW COST WAY FOR ENTHUSIASTS TO BREAK INTO THE WORLD OF MODULAR SYNTHESIS
WHO ARE WE
- WE ARE MEMBERS AT THE CONNECTED COMMUNITY HACKERSPACE - A COMMUNITY FOR
Parts
43| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1N4148 | HackSynth:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 4 | 1k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11, R12, R13 |
| 3 | 4.7k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R5, R6 |
| 3 | BC550 | HackSynth:TO-92_Inline - Handsolder | Q1, Q2, Q3 |
| 2 | 100R | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R8 |
| 2 | 10k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4 |
| 2 | 220nF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C1, C3 |
| 2 | Conn_01x03 | HackSynth:JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J4, J5 |
| 2 | OUT | HackSynth:Jack_3.5mm | J2, J3 |
| 2 | TL072 | HackSynth:DIP-8_W7.62mm_LongPads | U2, U3 |
| 1 | 100k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 100k Trim | HackSynth:TrimPot_Bourns_3339S_Horizontal | RV5 |
| 1 | 10uF | HackSynth:CP_Radial_D5.2mm_P2.50mm_LayDown | C2 |
| 1 | 1uF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C4 |
| 1 | 5.6k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 1 | ATTACK 1M | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV3 |
| 1 | BC547 | HackSynth:TO-92_Inline - Handsolder | Q4 |
| 1 | DECAY 1M | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV2 |
| 1 | ICM7555xP | HackSynth:DIP-8_W7.62mm_LongPads | U1 |
| 1 | IN | HackSynth:Jack_3.5mm | J1 |
| 1 | LED | HackSynth:LED_D5.0mm | D5 |
| 1 | RELEASE 1M | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV4 |
| 1 | SUSTAIN 10k | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV1 |
| 1 | SW_SPDT | HackSynth:Switch SPDT - MTS-102 | SW1 |
| 1 | Val** | HackSynth:PancakeLegend Logo - 10mm | Ref** |
| 1 | Val** | HackSynth:CCHS Logo - 10mm | Ref** |
The 42 most common of 43 parts.
Questions
How big is the ASDR - Old PCB?
It measures 50 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ASDR - Old use?
43 parts, built around the TL072, BC550 and BC547. 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 ASDR - Old KiCad files?
From the PancakeLegend/HackSynth repository on GitHub, at the commit this page was made from: the board is KiCAD/ASDR/ASDR - Old.kicad_pcb and its schematic KiCAD/ASDR/ASDR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ASDR - Old design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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