230D
About the 230D PCB
230D is an open source PCB design by DunningtonAudio, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 104 × 158 mm, with 176 components from 37 distinct parts.
Other key parts include the LM348 and LM321. By type, the board carries 87 resistors, 36 capacitors, 15 diodes, 12 connectors, 6 ICs and 3 transistors.
From the project
A triple envelope follower project
The 230D Triple Envelope Follower is designed to replicate the functionality of the Buchla 230A module using modern construction techniques and readily available parts. It is primarily based on the original circuit designed by Don Buchla, with the following additions/alterations:
Proper current limiting implemented for pulse output LEDs, increasing LED life and preventing crosstalk between channels Pulse/gate output voltages adjusted to 10V/5V Pulse outputs are buffered, protecting the passive pulse generation network from the effects of loading when stacking one output to multiple…
Main components on the 230D
230D bill of materials (BOM)
176 components, 37 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | LM348 | SOIC-14_3.9x8.7mm_P1.27mm | U101, U201, U301 |
| 3 | LM321 | SOT-23-5 | U102, U202, U302 |
| 1 | Serial_Box_150mil | Serial_Box_150mil | M2 |
| 1 | Mod_Indicator_1-10_150mil | Mod_Indicator_1-10_150mil | M3 |
| 3 | MMBT3904 | SOT-23 | Q101, Q201, Q301 |
| 3 | 41 | Switchcraft_41 | J101, J201, J301 |
| 3 | 108-0902 | Johnson_108-09XX-001 | J102, J202, J302 |
| 6 | 108-0910 | Johnson_108-09XX-001 | J103, J104, J203, J204, J303, J304 |
| 3 | SW_SPDT | M201xSS1x01 | SW101, SW201, SW301 |
| 3 | 5k | Potentiometer_Bourns_3314J_Vertical | TR101, TR201, TR301 |
| 3 | 50kA | RV16AF-41-(L)R1-XXX | VR101, VR201, VR301 |
| 3 | 1MA | RV16AF-41-(L)R1-XXX | VR102, VR202, VR302 |
| 3 | 3V9 | D_SOD-323 | D101, D201, D301 |
| 3 | BAV99 | SOT-23 | D102, D202, D302 |
| 6 | BAS16 | SOT-23 | D103, D105, D203, D205, D303, D305 |
| 3 | Red_3mm | LED_D3.0mm | D104, D204, D304 |
| 3 | 10u | L_0805_2012Metric | L1, L2, L3 |
| 3 | 22u | CP_Elec_5x5.3 | C1, C2, C3 |
| 6 | 1u | CP_Elec_4x5.3 | C101, C104, C201, C204, C301, C304 |
| 12 | 100n | C_0805_2012Metric | C102, C103, C110, C111, C202, C203, C210, C211 +4 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | 100p | C_0805_2012Metric | C105, C107, C205, C207, C305, C307 |
| 6 | 47n | C_0805_2012Metric | C106, C109, C206, C209, C306, C309 |
| 3 | 4u7 | CP_EIA-3528-21_Kemet-B | C108, C208, C308 |
| 3 | 150k | R_0805_2012Metric | R101, R201, R301 |
| 6 | 4k7 | R_0805_2012Metric | R102, R124, R202, R224, R302, R324 |
| 6 | 10M | R_0805_2012Metric | R103, R110, R203, R210, R303, R310 |
| 3 | 22M | R_0805_2012Metric | R104, R204, R304 |
| 6 | 330k | R_0805_2012Metric | R105, R116, R205, R216, R305, R316 |
| 21 | 33k | R_0805_2012Metric | R106, R107, R108, R109, R112, R113, R121, R206 +13 |
| 6 | 15k | R_0805_2012Metric | R111, R119, R211, R219, R311, R319 |
| 6 | 68k | R_0805_2012Metric | R114, R117, R214, R217, R314, R317 |
| 3 | 4M7 | R_0805_2012Metric | R115, R215, R315 |
| 6 | 11k | R_0805_2012Metric | R118, R127, R218, R227, R318, R327 |
| 3 | 100k | R_0805_2012Metric | R120, R220, R320 |
| 6 | 6k8 | R_0805_2012Metric | R122, R125, R222, R225, R322, R325 |
| 6 | 1k | R_0805_2012Metric | R123, R129, R223, R229, R323, R329 |
| 6 | 10k | R_0805_2012Metric | R126, R128, R226, R228, R326, R328 |
230D design files
The KiCad project lives in the DunningtonAudio/230D repository on GitHub; these links point at the commit this page was built from.
- Layout230D.kicad_pcb
230D: common questions
How big is the 230D PCB?
The 230D measures 104 × 158 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 230D?
176 components, from 37 distinct parts. The full bill of materials is listed on this page.
Where can I download the 230D design files?
From the DunningtonAudio/230D repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the 230D design in my own project?
Yes, under the terms of its GPL-3.0 license, which DunningtonAudio chose for the repository.