SATURABLE CORES AND MAG-AMPS

As the alternating current input of a transformer increases, the output also increases, but it reaches a maximum value when the core becomes saturated and can no longer increase its magnetization. If the transformer is purposely operated under these conditions, the output will be constant, even if the input varies a small amount. This is sometimes used to provide a dependable, constant voltage to operate sensitive instruments, heaters, and other devices, and it is called a saturable core reactor or a constant voltage transformer. In newer equipment designs, it has mostly been replaced by the semiconductor devices that will be described in Chapter 15 (Fig. 15.6). 

Transformer, 120V to 12V, 450 ma, center tapped Resistor, 100 ohm, 10 or 1 watt Potentiometer, 5K Capacitor, 1000 mfd Neon test light, 90 volts 

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