This classic windscreen wiper interval setup was found in American documentation from the 90s. The circuit can be found with variations at other points on this site.
Found in an English documentation from the 90's, this circuit makes slow logical pulses audible,...
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...
The basic purpose of this circuit is to apply an audio signal to a video carrier for sound and...