4 layers67.5 × 9.2 mm
Ref mic
loudifier/OpenRefMic
open hardware design for a high-performance low-cost measurement microphone
47 parts169MIT
Boards using the OPA4991ID
5 boardsBoards in 5 GitHub repositories, designed in KiCad, that use the OPA4991ID by Texas Instruments (-20V~-1.35V、1.35V~20V -40℃~+125℃ 10.8nV/√Hz@1kHz 10pA 10pA 125uV 130dB 2.7V~40V 21V/us 300nV/℃ 4 4.5MHz 560uA 75mA Enable/shutdown function、EMI filtering/RF suppression Rail-to-Rail Input, Rail-to-Rail Output SOIC-14 Operational Amplifier ROHS). See how each wires it, with its parts, size, README and files; the OPA4991ID’s symbol, footprint and pinout are on its own page.
- 4 layers114 × 120 mm
- 2 layers20 × 108 mm
Helium
wntrblm/Helium
Helium is a triple 1-to-3 precision buffered multiple and 3-to-1 precision adder
67 parts17 - 2 layers102.3 × 51 mm
- 4 layers40.6 × 58.4 mm
