Soft Start Circuit For Power Amps Home Theatre Audio Amplifier Transformer (Inrush Current Limiter)

When your power amplifier is switched on, the initial current drawn from the mains is many times that even at full power. Transformers will draw a very heavy current at switch on, until the magnetic flux has stabilised. Soft starter limit the initial current. Anyone who has a large power amp – especially one that uses a toroidal transformer – will have noticed a momentary dimming of the lights when the amp is powered up. The current drawn is so high that other equipment is affected (including other power transformers on the same electrical circuit).