提高电加热器的加热速度简单的方法有两种：
1.用二极管半波整流，改变交流电的有效值，达到改变加热功率和加热速度的目的；此方法应用最多，其优点是电路结构简单操作方便。
2.变压，用小型变压器变压，优点是可多档调节，缺点是电路结构较复杂，制作成本高。
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