Ring detector (CB9112E)

This circuit reproduces the dial noise in a small speaker. The transistor can be a general-purpose type. We found it in an 80's Electronic Design.

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Stair Generator (CB9141E)
Found in an old Radio Electronics, this circuit uses common components today. The resistors of the IC...
Synchronized AC switch (CB9261E)
Found in a 1965 General Electric circuit manual, this circuit uses SCRs from that time. Modern...
3-10MHz Oscillator (CB23730E)
The modified Hartley oscillator, seen in figure 2, can generate signals ranging from 3 MHz to 10...