This type of sensor was used in sensitive infrared systems from the 1960s. This circuit was found in sensors with a Nipkow disk. Equivalent transistors can be used, but the sensor is no longer easily found.
This type of sensor was used in sensitive infrared systems from the 1960s. This circuit was found in sensors with a Nipkow disk. Equivalent transistors can be used, but the sensor is no longer easily found.