| ??? 03/07/17 19:05 Read: times |
#190758 - Relay noise, add a zener with the flywheel diode Responding to: ???'s previous message |
A significant part of relay noise is coming from contacts due
to the coil not charged/discharged fast enough because of the surrounding magnetic field. The typical flyweel diode is not an industry good practice because it keeps running the coil from the magnetic field until it is "drained" and the relay contacts are in a unsafe holding force during that period. By adding a zener then the coil cut-off is far more fast because it is running for a smaller part of the time until total cut-off. So the contacts act more quickly and the noise is far less than without the addded zener. For a 12V coil relay a zener or 12V to 18V is a valid option, always in series with the flywheel diode connected cathode to cathode (or anode to anode). |
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