This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
An interesting possibility of use for the 555 CMOS is as a low consumption LED flasher, as shown. In...
This circuit is based on an operational window comparator. We found it in a documentation from the...
This is the target for the CB18793E infrared firing gun. The circuit can be powered by voltages from 5...