This circuit for the 1750 m band was published in the September 1989 Radio Electronics magazine. The range depends on the antenna system and receiver used.
The circuit illustrated in the figure can be used to detect earthquakes or vibrations of...
This circuit was found in a 1989 documentation. The circuit directly controls a power load by the use...
Hybrid PWM controllers with integrated 8-bit microcontrollers for supervision and management can...