TITLE
Apple II & IIe: Power Supply Input Frequency Limitations 

Article ID: 3
Created: 9/18/87
Modified: 7/27/98
 

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TOPIC 
The Apple II and IIe power supply is a switching power supply. It is designed to 
accept 107 to 135 volts from DC to 60 Hz.


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DISCUSSION 

It will also work at up to 400 Hz but this endangers a circuit which protects the 
supply from shorting to the point that the protecting circuit will not work.