Voltage to frequency converter (CB8928E)

Found in ancient American documentation, this circuit uses an operational amplifier of the time, which is uncommon today.

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Oscillator with AGC (CB6321E)
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...
5 W Transistor Amplifier (CB10749E)
This circuit was obtained in a 1961 magazine, but it can be easily assembled today, as the...
LM3900 Buffer (CB14186E)
We found the configuration below, with unit gain, in the National Semiconductor Linear...