This circuit uses an unusual PLL, the 4046 CMOS. We found it in the October 1994 issue of Electronics Now. The circuit also uses a 4093 gate as a trigger.
This simple intermittent siren circuit was found in a 1989 documentation. Both the intermittent and...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
This conventional window comparator configuration was found in an old documentation. It is valid...