Input stage
About the Input stage PCB
Input stage is an open source PCB design by BasementCircuits, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 45 × 85 mm, with 17 components from 8 distinct parts.
Other key parts include the TLC272. By type, the board carries 8 resistors, 4 capacitors, 3 connectors and 1 IC.
It belongs with the audio and test & measurement designs in this gallery.
From the project
Analog seven-band spectrum bargraph with op amps.
Each band has a spacing of 1.25 octaves. The bands are: 63 Hz, 160 Hz, 400 Hz, 1.25 kHz, 2.5 kHz, 6.25 kHz, 16 kHz.
The filters are second-order Multiple Feedback bandpass filters using TLC272 opamps. The VU-meters consist of a logaritmic comparator array, also using TLC272 opamps. The project is inspired by a reel of 2000 TLC272 bought cheaply at an auction.
Main components on the Input stage
Input stage bill of materials (BOM)
17 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TLC272 | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 2 | SJ1-3523N | CUI_SJ1-3523N | J1, J2 |
| 1 | Conn_01x04 | JST_EH_S4B-EH_1x04_P2.50mm_Horizontal | J3 |
| 1 | 100k | Potentiometer_Bourns_TC33X_Vertical | RV1 |
| 4 | 100nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2, C3, C4 |
| 5 | 100k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R5, R7, R8 |
| 2 | 22k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4 |
| 1 | 160k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
Input stage design files
The KiCad project lives in the BasementCircuits/Sonus7 repository on GitHub; these links point at the commit this page was built from.
Input stage: common questions
How big is the Input stage PCB?
The Input stage measures 45 × 85 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Input stage?
17 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the Input stage design files?
From the BasementCircuits/Sonus7 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Input stage design in my own project?
Yes, under the terms of its CERN-OHL-W-2.0 license, which BasementCircuits chose for the repository.
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