High-speed peak detector (CB9699E)

This circuit was obtained from an American documentation from the 80s. Integrated circuits are from that time and are not easy to find today.

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Selective Amplifier (CB19010E)
We found this circuit in an old documentation. The operational amplifier used is uncommon today, but...
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Transistorized receiver (CB22218E)
We found this circuit in a documentation from the 50s. It is based on CK722 germanium transistors. The...