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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Voltage Controlled Oscillator (CB12016E)
This VCO or Voltage Controlled Oscillator uses common components. TR1 can be a BF245 and TR2 a...
Sound Effects Center (CB17485E)
The transformer for this project found in a 1986 documentation is an output type, found on old...
Regulator Crowbar Protection (CB13916E)
We found this circuit in a 1978 documentation. The SCR conducts when the regulator's output...