Current to Voltage Converter (CB6101E)

This circuit was suggested by Analog Devices in 1980s documentation. The circuit has a grounded bias and sensor.

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Plant moisture monitor (CB6273E)
This circuit monitors the humidity of a pot or plant bed, providing indication on two LEDs. The...
Zero Crossing Detector (CB19481E)
This “zero crossing detector” was found in a manual of operational amplifiers from the 1980s....
Infrared Receiver TDA3047 (CB15395E)
This narrowband data receiver is from the Philips Databook of 1990. The circuit is powered by 5 V...