Minimizing Circuit Uncertainty

Making circuit failures visible.

Have you ever built a circuit that should work - only to spend hours debugging before realizing one component was defective? That uncertainty was the problem my team and I were tasked with addressing for the Duke BME electronics labs.

Students were spending valuable lab time troubleshooting systems that were electrically sound, except for one hidden variable: a faulty chip. There was no quick way to verify if the chip was working - so we set out to design one.

Our solution was a dedicated PCB chip tester that allows the chip to be connected in isolation. By removing the chip from the larger circuit and placing it into a controlled testing environment, users can immediately observe LED outputs that validate core functionality.

Technical Highlights:

  • Designed a multi-chip validation PCB capable of testing instrumentation amplifiers (AD623, INA126) and operational amplifiers (MCP6002, LF353)

  • Designed in Kicad.

  • Designed and integrated a Schmitt trigger oscillator circuit to generate stable test waveforms for LED blinking and functional verification

  • Powered by a 9V battery, enabling a fully portable testing platform.

  • Implemented LED-based output indicators to provide immediate visual confirmation of chip behavior

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