ADSR SR 2-26-21
About the ADSR SR 2-26-21 PCB
ADSR SR 2-26-21 is an open source PCB design by elandahl, published on GitHub. It is a 2-layer board measuring 35 × 107 mm, with 40 components from 19 distinct parts.
Other key parts include the 555N and TL082. By type, the board carries 12 resistors, 9 capacitors, 6 diodes, 3 transistors, 2 ICs and 2 connectors.
It belongs with the audio designs in this gallery.
From the project
Analog Electronics course featuring Eurorack modular synth project
This Eurorack-compatible module implements an ADSR (Attack, Decay, Sustain, Release) envelope generator using a TLC555 CMOS timer, op-amps, discrete transistors, and a shaping network of resistors, capacitors, and diodes. When triggered by a gate signal, it produces a control voltage that follows a classic ADSR shape used to control VCAs, filters, or pitch over time in a modular synthesizer.
Main components on the ADSR SR 2-26-21
ADSR SR 2-26-21 bill of materials (BOM)
40 components, 19 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 555N | DIP-8_W7.62mm | IC1 |
| 1 | TL082 | DIP-8_W7.62mm | U1 |
| 3 | 2N3904 | TO-92L_Inline_Wide | Q1, Q2, Q3 |
| 2 | AudioJack2_Ground | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J1, J2 |
| 3 | 2M | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | POT1, POT2, POT4 |
| 1 | 10k | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | POT3 |
| 1 | ML10 | IDC-Header_2x05_P2.54mm_Latch_Vertical | SV1 |
| 1 | SW_MEC_5G | SW_DIP_SPSTx01_button_custom_SR | SW1 |
| 5 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5 |
| 1 | LED | LED_D3.0mm | D6 |
| 7 | 10nF | C_Rect_L7.0mm_W2.0mm_P5.00mm | C1, C2, C4, C6, C7, C8, C9 |
| 1 | 10uF | CP_Radial_D5.0mm_P2.00mm | C3 |
| 1 | 2uF | C_Rect_L7.0mm_W2.0mm_P5.00mm | C5 |
| 2 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R7 |
| 1 | 22k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 1 M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 4 | 4.7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5, R6, R8 |
| 3 | 220r | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R10, R11 |
| 1 | 2.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
ADSR SR 2-26-21 design files
The KiCad project lives in the elandahl/eurorack-course repository on GitHub; these links point at the commit this page was built from.
ADSR SR 2-26-21: common questions
How big is the ADSR SR 2-26-21 PCB?
The ADSR SR 2-26-21 measures 35 × 107 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ADSR SR 2-26-21?
40 components, from 19 distinct parts. The full bill of materials is listed on this page.
Where can I download the ADSR SR 2-26-21 design files?
From the elandahl/eurorack-course repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the ADSR SR 2-26-21 design in my own project?
The repository has no license, so all rights stay with elandahl. Use it as a reference, and ask the author before reusing the design.
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