Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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Electronic Time Mark (CB16302E)
Waking up to a loud and clear sound from an audio oscillator, after up to 5 hours of sleep, or...
Metronome (CB13033E)
Short duration pulses or "clicks" can be generated with the circuit seen in the figure. The...
Two Tone Alarm (CB12218E)
This circuit is from a 1992 Electronics Handbook. The circuit generates a special tone effect for...