This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the 1980s. The used integrated circuit is uncommon today.
This circuit provides a pulse train of 4 MHz or at another frequency determined by the crystal during...
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...
ST Microelectronics has, in its line of low voltage drop linear regulators, the KD1084xx (fixed) and...