Alarm Buzzer (CB24392E)

This circuit was found in July 1975 Radio Electronics magazine. Power depends on the trigger transistor and the effects of capacitors C1 and C2.

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Micro AM Radio (E/P) (MIN020E)
This micro AM radio will tune strong stations in the frequency range between 530 and 1,600 kHz....
Flashing night light (CB6799E)
This circuit was obtained in a Electronics World of 1968. The transistors can be equivalent as the BC558...
Bargraph Voltage Monitor (CB24608E)
Based on an integrated circuit of the time, this circuit appeared in the October 1979 issue of...