Found in a Popular Electronics from the 90s, this circuit can act as a transmitter for an audio link. The output transistor admits a higher power equivalent, depending on the LED.
White noise applied to an audio amplifier can be used as a relaxant, since it resembles the noise...
This circuit was found in the March 1993 issue of Electronics Now magazine. The circuit is a...
This circuit is from an old documentation from 1995, but it can be easily assembled today by the...