This circuit was found in a 90s Popular Electronics. The circuit uses components from that time, intended to receive signals in the range of 150 to 250 kHz.
This circuit indicates a digital value through a moving bar. The circuit is TTL and must be...
This circuit was found in an Electronic Engineering of the 80s. The circuit indicates when a...
This configuration is from an old Motorola publication from the 70s. In it we have the way to...