| 摘要 |
A negative ion generator (10) for the production of biological active ions is provided with needle assemblies having needle points (17). The generator (10) has a drive circuit for providing voltages to the needle points and a selection circuit for selecting the amount and/or frequency at which ions are produced. The needle points (17) are user replaceable with plug (21) and socket (22) type connections. Needle point replacement indicator means are included for providing visual indication of when the needle points (17) should be replaced. The driver circuit may include a safety current route in the event of an earth fault.
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