| 摘要 |
<p>Small electronic air filter, esp. for small air flows e.g. 50 m3/hour, comprises fan, ionising electrodes and precipitation plates. The positive electrodes are connected to a high D.C. supply of value U, the positive plates to a voltage of U/ 2. Both are produced by a current source (e.g. transformer), H.T. stage, and output stage.</p> |
