In the figure we have 3 oscillators with logic gates that can be triggered by external logic signals. The circuits were found in the Radio Electronics magazine of April 1987.
In this circuit the LED lights up when the voltage drops below the value set in the trimpot. The...
Several types of OSEPP sensor modules can be obtained from Mouser Electronics for Arduino...
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...