Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The circuit uses components that are still common today.
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....
This is the transmitter for the previous circuit. We found it in a 90s Electronics Now. The...
This circuit compresses the dynamic range (amplitudes) of an audio signal. The circuit is passive and...