This stage was found in a 1964 Electronic Design. The transistors are of the time and the shape of the signal obtained is shown in the diagram.
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...