Synchronized switch (CB8253E)

Synchronized key. This circuit was found in a 1966 General Electric documentation. Modern equivalent components can be used.

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2 to 9 kHz PLL Synthesizer (CB4566E)
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...
1 MHz Low Pass Filter (CB4833E)
The integrated circuit used in this filter is not very common today, but the reader can use...
Standard cell amplifier (CB6841E)
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...