Level: Medium – Design a circuit with two photodiodes in a differential configuration to detect the direction of the highest intensity light source.
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Level: Medium – Design an OPAMP transimpedance amplifier to convert the small photodiode current into a measurable voltage.
## Objective and use case
You…
Master Analog Electronics by building an optical audio receiver. Use a Photodiode and TIA to demodulate light beams into clear, isolated audio signals.
Master Analog Electronics by building a non-contact RPM sensor. Use a Photodiode to detect rotation and generate clean digital pulses for motor speed control.
Master Analog Electronics by building a light beam alarm. Use a Photodiode to detect interruptions and trigger a 0.7V signal that lights up a security LED.
Master Analog Electronics by comparing sensor speeds. Build a circuit using a Photodiode and LDR to observe sharp square waves versus slow voltage curves.
