Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

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Two Input Mixer (CB6307E)
Equivalent transistors like the BC548 can be used on this 1969 Mullard circuit. The circuit has two...
Voltage controlled high pass filter (CB25152E)
Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of...
Audio compressor (CB7099E)
Found in the book 303 Circuits, this circuit compresses signals from 25 mV to 20 Vpp to...