Oscillator for the medium wave range (CB21140E)

This ground-based circuit was found in 1990s American documentation. The transistor can be any general-purpose equivalent.

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Charger and No Break (CB4138E)
Suggested by an old American documentation the circuit below keeps a battery charged and at the...
Cascading the 4518 (CB082E)
The 4518 can be cascaded to count to values higher than 10. The output EN of this device can be...
Long interval timer (CB12648E)
The circuit shown in the figure makes it possible to trigger a load after times that can extend up to 4...