We found this circuit in the January 1978 issue of Radio Electronics magazine. The integrated circuit is from that time and is powered by a 9 V battery. The signal must be applied to an amplifier.
This is the traditional configuration of an unregulated bridge rectified power source. The circuit...
This unijunction buzzer configuration appears in this section from many publications and sources. The...
In the figure we show a configuration for a crystal controlled overtone oscillator using a...