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 activates an output, which can be a lock, only when a card containing the programmed code...
August 2017 - Texas Instruments is announcing the availability by Mouser Electronics of its new...
This circuit was obtained in a Popular Electronics of 1991. The magazine no longer exists, but the...