Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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Divider by 2.5 (CB12441E)
This circuit is from a 1991 publication. It divides the frequency of a TTL signal applied to its...
Gyroscope with MEMS inertial sensor (CB12955E)
The circuit in the figure is suggested by ST Microelectronics (www.st.com) and consists of a...
MOSFET VHF Amplifier (CB4688E)
This MOSFET amplifier operating in the VHF range was found in an old American telecommunications...