Clock radios

Clock radios turned up under small electronics and again under portable entertainment. This page is the desk set: a display, a radio, and an alarm that has to survive the night.

The time memory is a small battery or a capacitor. After a power cut, a clock that blinks 12:00 never had that battery installed, or the battery is dead. The alarm buzzer runs on house power on many sets. A battery that saves the time does not always sound the alarm during an outage. Read that line before you trust one beside a bed. AM reception uses a ferrite bar inside the case, and moving the whole radio changes the signal. FM often uses the power cord or a thin wire as the antenna. Wrapping that wire around the cord for neatness is how FM gets weak.