Medical thermometer (CB7880E)

This circuit of an old medical publication makes use of an integrated circuit of the time, uncommon in our times. The sensors are diodes.

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Optical Gain Control (CB6324E)
This simple circuit controls the signal amplitude through a photoresistor optical coupler. The...
Light Activated AND Gate 2 (CB5318E)
This circuit can be implemented with standard photodiodes consisting of a two input optical AND gate....
Operational audio amplifier (CB21109E)
In the figure we have the basic configuration of an operational amplifier for audio signals. The...