Standard 1 MHz Oscillator (CB9653E)

We found this circuit in an old American documentation. Transistors can be modern equivalents.

Sequential Timer with LM3914 (CB24659E)
We found this circuit in the October 1980 issue of Radio Electronics magazine. The circuit uses...
Flood alarm (CB20728E)
Found in an English publication from the 1980s, this circuit uses components that are still common...
Tunnel diode delay (CB21431E)
With two cascading tunnel diodes, this circuit found in a 196 General Electric documentation...