Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994 issue of Electronics Now magazine. The power is provided by the transistor and is small in this case.
We found this power supply in the 1982 SGS Linear Integrated Circuits manual. The L296 is not...
This circuit monitors the voltage of a 12 V battery. The indicated levels let you know if the...
Suggested by Motorola documentation from the 1980s, this circuit can be implemented with...