Chua memcapacitor
About the Chua memcapacitor PCB
Chua memcapacitor is an open source PCB design by heurstc, published on GitHub. It is a 4-layer board measuring 50 × 50 mm, with 17 components from 14 distinct parts.
Other key parts include the TL072. By type, the board carries 10 resistors, 4 capacitors, 1 IC, 1 transistor and 1 inductor.
From the project
5D chaos monitor: XIAO RP2350 + ADS1262 streaming Chua attractor data at 12kHz/ch over USB CDC to Linux
Real-time acquisition and visualisation of a 5-dimensional chaotic attractor using a Seeed Studio XIAO RP2350 and two ADS1262 32-bit ADCs, streaming to Linux at 12 kHz per channel over USB CDC.
Each of the 5 channels uses a 3-op-amp topology:
- TL072-A — unity-gain input buffer; isolates Chua source impedance - ÷4 attenuator — 30kΩ/10kΩ voltage divider; maps ±8V Chua → ±2V - TL072-B — unity-gain divider buffer; eliminates 7.5kΩ Thevenin source loading that would shift the filter cutoff from 4.95 kHz to 3.74 kHz - Sallen-Key LPF — 2nd-order Butterworth, fn = 4.95 kHz, Q = 0.731; R1=R2=10kΩ…
Main components on the Chua memcapacitor
Chua memcapacitor bill of materials (BOM)
17 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL072 | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | MMBF4118 | SOT-23 | Q1 |
| 1 | 18mH | L_Bourns_SRR1260 | L1 |
| 1 | 10nF X7R | C_0402_1005Metric | C1 |
| 1 | 100nF X7R | C_0402_1005Metric | C2 |
| 1 | 100nF | C_0402_1005Metric | C3 |
| 1 | 47pF C0G | C_0402_1005Metric | C4 |
| 2 | 3.3k | R_0402_1005Metric | R1, R4 |
| 2 | 22k | R_0402_1005Metric | R2, R5 |
| 2 | 18k | R_0402_1005Metric | R3, R6 |
| 1 | 1.8k | R_0402_1005Metric | R7 |
| 1 | 12R | R_0402_1005Metric | R8 |
| 1 | 1M | R_0402_1005Metric | R9 |
| 1 | 47k | R_0402_1005Metric | R10 |
Chua memcapacitor design files
The KiCad project lives in the heurstc/Chua-memcapacitor repository on GitHub; these links point at the commit this page was built from.
- Layoutkicad/chua_x7r.kicad_pcb
- Schematickicad/chua_x7r.kicad_sch
- BOMkicad/bom.csv
Chua memcapacitor: common questions
How big is the Chua memcapacitor PCB?
The Chua memcapacitor measures 50 × 50 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Chua memcapacitor?
17 components, from 14 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 Chua memcapacitor design files?
From the heurstc/Chua-memcapacitor 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 Chua memcapacitor design in my own project?
The repository has no license, so all rights stay with heurstc. Use it as a reference, and ask the author before reusing the design.