This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit is based on a 555 and a MOSFET consisting of a flasher that controls a buzzer.
This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and...
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for...