Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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Logical optical driver (CB7298E)
This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with...
Voltage-tuned filter (CB6938E)
This 1000: 1 voltage-controlled filter circuit was found in an Electronics Today International in a 1980s...
TPL577x Series of GaAIAs and Photo-Integrated Infrared LEDs
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...