Linear photometer (CB7366E)

This circuit was found in a 1967 Philips publication. Transistors support equivalents and modern equivalents can be used.

TTL Optical Sensor (CB16930E)
This circuit can be used as an optical switch or photosensor to excite TTL logic. The transistor can be...
Simple Microphone Preamplifier (CB4768E)
This circuit was found in a Popular Electronics of the 90s. The output amplitude will be between...
FM Demodulator (CB6196E)
This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a...