Radiation thermometer (CB7242E)

Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The sensor is of the type that is difficult to obtain today.

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CMOS logic test (CB8910E)
This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of...
OP27 Microphone Amplifier (CB19720E)
The low-noise amplifier shown uses a rare Raytheon operational amplifier today. The circuit can be...
White LED Flasher (CB20426E)
This circuit, found in American documentation, works as a voltage doubler, enabling the supply of a...