Loudspeaker Protection | Electronic Project Circuits

Posts Tagged ‘loudspeaker protection’

Overload protection circuit

Generally the level of a signal that departs output of sound signal generator the all. The that get fix have standard same score be 1Vrms. But in now audio signal generator the all the that may produce come to exceed limitation standard of the level input of stereo power amplifier. Thus have to have Overload protection circuit, for protect a part amplifier and a loudspeaker are damaged.
From circuit that picture when have input voltage resistor R1 perform current limit preceding still diode D1-D4 , build model Full wave rectifier circuit, for change ACV come to be DCV. By still be Input voltage give with transistor Q1 be when input voltage level (Vin) exceed tall 1 mV RMS. The transistor work be like something through the circuit. Then make have no volt signal pass by give with output (Vout).

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Categories: Electronic Control, Security Tags: loudspeaker protection, overload protection circuit

Loudspeaker Protection with Soft Start

This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply will be applied. This delay protects the loudspeakers from undesirable bangs that are observed when open the supply switch. The Leds D 4-5 provide a optical indication for the circuit operation [D4 (green)=OK and D5(red)= delay or presence DC voltage]. The supply of circuit becomes from a symmetrical Â±12Volts, which we can take from small independent power supply or from afterwards suitable demotion of main power supply. It will be supposed you make a circuit of protection for each final amplifier that you dispose. Proportional attention it should you show for the quality of RL1 that the contacts of will be supposed to bear the current that passes from he.