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.
This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a...
This circuit was found in an American documentation two years 80. The MOSFET is of double port,...
This circuit is from American documentation from the 90s. The transistor is general-purpose and...