This simple logic test circuit with 3 LEDs was found in October 1985 Radio Electronics magazine. The power supply is according to the logic, and this version is indicated for TTL.
SST OXY Flex Oxygen Sensor The purpose of this SST sensor is to measure oxygen level in enclosed...
The basic idea of this 1988 circuit is to use a signal called REMOTE existing in some types of...
With each touch on S1, an output of 4017 is activated, this in sequence 3, 2, 4, etc. These...