output relay delay audio amplifier

Posted on Feb 6, 2014

This is a simple ambit which I congenital to one of my audio amplifier projects to ascendancy the apostle achievement relay. The purpose of this ambit is to ascendancy the broadcast which turns on the apostle achievement broadcast in the audio amplifier. The abstraction of the ambit is adjournment about 5 abnormal ofter the ability up until the sp

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akers are switched to the amplfier achievement to abstain annoying thump complete from the speakers. Another feeature of this ambit is that is disconnects the apostle immdiatly back the ability in the amplifier is cut off, so avoinding sometimes awful sounds back you about-face the equipments off. Then ability is activated to the ability ascribe of the circuit, the complete appearance of AC voltage accuse C1. Then C2 starts to allegation boring through R1. Back the voltage in C2 rises, the emitter achievement voltage of Q1 rises tigether with voltage on C2. Back the achievement voltage of Q2 is aerial abundant (typically about 16. 20V) the broadcast goes to on accompaniment and the broadcast witches affix the speakers to the amplifier output. It takes about about 5 abnormal afterwards ability up until the broadcast starts to condict (at complete time depends on the admeasurement of C2, broadcast voltage and ambit ascribe voltage). When the ability is switched off, C1 will apart it`s energu absolutely quicly. Additionally C2 will be answerable absolutely quicly through R2. In beneath than 0. 5 abnormal the speakers are broken from the amplifier output. This ambit is not the best authentic and affected design, but it has formed accurately in my baby homebuilt PA amplifier. This ambit can be additionally acclimated in abounding added applications area a about-face on adjournment of few abnormal is needed. The adjournment...

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