Hi, on searching circuit in Google, i got this schematic in which capacitor & resistance are connected in series with transformer input.
how it cancel noise??
how it cancel noise??
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If there is current flowing through the transformer primary when the switch is turned off, a large voltage "spike" will result. The resistor and capacitor in series across the switch act as a "snubber" to limit the amplitude of the initial spike, and to cause subsequent oscillations to quickly decay.
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