NOS R-2R DAC
About the NOS R-2R DAC PCB
NOS R-2R DAC is an open source PCB design by k16shikano, published on GitHub. It is a 4-layer board measuring 75 × 154 mm, with 29 components from 19 distinct parts.
Other key parts include the OPA1656IDR and TLV709A01DBVR. By type, the board carries 9 capacitors, 9 resistors, 5 connectors, 2 ICs, 2 diodes and 1 transistor.
From the project
16ビットR-2RラダーによるDAコンバーターの設計
- TOSリンク（S/PDIF）からの44.1kHz入力 - ノンオーバーサンプリング - 左右2チャンネル - カードケージ構成（同一回路を1枚にまとめた SINGLEBOARD` あり）
DACCHANNEL と DACCHANNELAXIAL は同一の電気設計**で、S3 / S5 のどちらにも挿さります。 ラダー抵抗の実装方法だけが違います。
SINGLEBOARD もカードケージと同一の電気設計です。JBP とバックプレーンは無く、 R チャネルは 8xxx 参照（U8001 など）。±VREF はチャネルごとにローカル生成のままです。 信号層は F.Cu / In2.Cu / In3.Cu / B.Cu、In1.Cu と In4.Cu が GND ベタ（ラダー下は抜き）。 JRAW ヘッダ（J401 / J402` およびチャネル側）は基板上配線のタップとして残しています。
Main components on the NOS R-2R DAC
NOS R-2R DAC bill of materials (BOM)
29 components, 19 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPA1656IDR | Frozen_Package_SO__SOIC-8_3.9x4.9mm_P1.27mm | U401 |
| 1 | TLV709A01DBVR | Frozen_Package_TO_SOT_SMD__SOT-23-5 | U402 |
| 1 | MMBT3904LT1G | Frozen_Package_TO_SOT_SMD__SOT-23 | Q401 |
| 2 | JRAW_1x3 | JST_PH_S3B-PH-K-S_1x03_P2.00mm_Horizontal | J401, J402 |
| 1 | RCJ-043 | SameSky_RCJ-043 | J403 |
| 1 | RCJ-042 | SameSky_RCJ-042 | J404 |
| 1 | JBP_2x18_AB | TSW-118-08-S-D-RA_JBP_AB | J405 |
| 1 | ATQ207 / TQ2-9V | Panasonic_TQ2_THT | K401 |
| 1 | 1N4148WS | Frozen_Diode_SMD__D_SOD-323F | D401 |
| 1 | BAT54WS | Frozen_Diode_SMD__D_SOD-323F | D402 |
| 3 | 100nF | Frozen_Capacitor_SMD__C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C401, C402, C406 |
| 2 | 4.7uF | Frozen_Capacitor_SMD__C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C403, C404 |
| 2 | 4.7uF 35V | Frozen_Capacitor_SMD__C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C405, C407 |
| 2 | C0G DNP | Frozen_Capacitor_SMD__C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C408, C409 |
| 2 | 47R | Frozen_Resistor_SMD__R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R401, R402 |
| 4 | 100k | Frozen_Resistor_SMD__R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R403, R404, R408, R409 |
| 1 | 2.2k | Frozen_Resistor_SMD__R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R405 |
| 1 | 10k | Frozen_Resistor_SMD__R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R406 |
| 1 | 649k | Frozen_Resistor_SMD__R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R407 |
NOS R-2R DAC design files
The KiCad project lives in the k16shikano/r2r-dac repository on GitHub; these links point at the commit this page was built from.
NOS R-2R DAC: common questions
How big is the NOS R-2R DAC PCB?
The NOS R-2R DAC measures 75 × 154 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the NOS R-2R DAC?
29 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the NOS R-2R DAC design files?
From the k16shikano/r2r-dac repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the NOS R-2R DAC design in my own project?
The repository has no license, so all rights stay with k16shikano. Use it as a reference, and ask the author before reusing the design.
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