chopper frequency for phone


  • STAT Medevac - Wikipedia

    STAT MedEvac is a service of the Center for Emergency Medicine of Western Pennsylvania in ... and all phone and radio communications …

  • Chopper (electronics) - Wikipedia

    In electronics, a chopper circuit is used to refer to numerous types of electronic switching devices and circuits used in power control and signal applications. A chopper is a device that converts fixed DC input to a variable DC output voltage directly.