Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In early electronics vibrators were used in inverter circuits to provide an alternating current (AC) electric power supply from a direct current (DC) source. The primary use for this type of circuit was for vacuum tube type automobile radios. Vacuum tubes require relatively high voltages ranging from about 45 volts to 450 volts in consumer electronics. For portable radios, hearing aids and similar equipment, B batteries were manufactured with various voltage ratings. In order to provide the necessary voltage for a radio from the typical 6 or 12 volt DC supply available in a car or from an isolated farm lighting battery, it was necessary to convert the DC supply to AC and use a transformer to increase the voltage.

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