Locked solid state relay (CB8394E)

We found this circuit in a 90s Electronic Design. The components admit current equivalents. The circuit can act as a shield.

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500 mW push-pull amplifier (CB21795E)
This circuit was found in a Mullard transistor manual from 1960. Note the symmetrical power...
High impedance transistorized stage (CB7468E)
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...
Transmitter for of 15-meter range (CB20400E)
I found this little signaling transmitter in old American documentation. The circuit has a good...