Simple DAC Integration on PCB
Budget: $30 – $250 USD
I have a simple, already-routed PCB that needs one last feature before I can send it to JLCPCB: a single-channel digital-to-analog converter (DAC) capable of driving an electrical-stimulation stage. The board’s main rail is 18 V, so the solution may involve either a DAC that tolerates that headroom or a small buffer/level-shift stage—whichever keeps the design compact and parts available from JLCPCB’s catalogue.
The microcontroller on the board is an Arduino-compatible device, and I’m completely flexible on the interface; pick whichever is quickest to wire—SPI or I²C—provided you show me the pinout and an example write sequence.
What I’ll hand over the moment we start:
• Existing KiCad (v7) schematic and PCB files
• Mechanical constraints and connector map
• Target stimulation amplitude and load details
What I need back, tonight or first thing tomorrow:
• Updated schematic with the chosen DAC, passives, and any necessary output driver
• Fully-routed PCB that preserves current board outline and connector placement
• Gerber, drill, BOM, and CPL files that pass JLCPCB’s online checker without edits
• KiCad source files and a short Arduino sketch confirming the DAC output
Acceptance is simple: no ERC/DRC errors, JLCPCB uploads cleanly, and your test sketch produces the expected waveform on my scope. I’ll be online throughout the evening to answer questions and approve part choices immediately. If you have a clear evening and know your way around KiCad and JLCPCB’s assembly rules, this should be a quick win and $100 if done within 24 hours.
The microcontroller on the board is an Arduino-compatible device, and I’m completely flexible on the interface; pick whichever is quickest to wire—SPI or I²C—provided you show me the pinout and an example write sequence.
What I’ll hand over the moment we start:
• Existing KiCad (v7) schematic and PCB files
• Mechanical constraints and connector map
• Target stimulation amplitude and load details
What I need back, tonight or first thing tomorrow:
• Updated schematic with the chosen DAC, passives, and any necessary output driver
• Fully-routed PCB that preserves current board outline and connector placement
• Gerber, drill, BOM, and CPL files that pass JLCPCB’s online checker without edits
• KiCad source files and a short Arduino sketch confirming the DAC output
Acceptance is simple: no ERC/DRC errors, JLCPCB uploads cleanly, and your test sketch produces the expected waveform on my scope. I’ll be online throughout the evening to answer questions and approve part choices immediately. If you have a clear evening and know your way around KiCad and JLCPCB’s assembly rules, this should be a quick win and $100 if done within 24 hours.