This circuit is from 1999 documentation. However, it can still be easily assembled, as all components used are common. The sensors can have their quantity increased, being connected in parallel.
This high frequency modulator was found in Motorola's 1990 Linear Databook. The current depends on the...
This amplifier for FM antenna signals was published in Radio Electronics magazine in May 1963....
Found in Popular Electronics from the 90s, this circuit uses a reed switch on the rails as a...