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The original model of the clock radio had a mechanical digital clock and a tuning dial which was lighted and curved in an arc...this is why the dial pointer moves at an angle as the electronic clock model uses the same indicator mechanism but a more modern style dial scale.
The electronic version has a unique battery backup system. It uses a 1.5 volt ni-cd cell which is kept charged by the power supply and then if the power goes out, the 1.5 v cell powers a DC-DC inverter circuit to provide the higher DC voltage to keep the clock oscillator going. Often the ni-cd cell has gone bad over the years, though.
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10-03-2006, 11:54 PM
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