Reasons and solutions for the impact sound from the power amplifier switch
Time:2023-09-15
Views:696
Sometimes, when the power amplifier is turned on or off, there will be a "bang" impact sound. What is the reason for this huge impact sound? Is your amplifier broken? How should we handle it? Don‘t worry, I‘ll tell you how to handle this problem today.
The reason for the impact sound on the power amplifier switch
Reason 1: The front stage does not open, but it is connected to the rear stage, and then the rear stage is also closed, which is caused by the front stage closing, causing the rear stage to impact the horn.
Generally, the rear stage is equipped with a horn protection circuit. When the power is turned on, the horn is turned on after a delay and the horn is turned off immediately. The horn is disconnected - after 2-5 seconds of power on, a "click" sound is heard, which is a relay action. The contact controls the output of the power amplifier and the connection or disconnection of the speaker to avoid the impact of power on the speaker. When the power amplifier is turned off, this relay will immediately disconnect, thereby protecting the speaker.
Reason 2: The output of the previous stage does not match the input of the power amplifier.
This can be one of the reasons for the impact sound of "connecting the front stage, but not turning on and off the power amplifier". This is related to the output of the front stage and the input circuit of the rear stage, and it is also possible that the "input" circuit of the rear stage affects the "relay control" circuit of the rear stage. This is why if you do not connect the front stage and then turn off the rear stage, it will not be possible. It may be that there is a shared power supply between the two circuits in the design, and the specific situation depends on the circuit.
Method for handling impact sound when the power amplifier is turned on or off:
Solution 1: The sequence of front and rear level shutdowns should be clarified.
It should be closed first, then the previous level. This avoids the possibility of the impact signal being amplified during the shutdown of the previous stage and then impacting the horn during the later stage operation.
Solution 2:
Install a capacitor on the switch! 103/600V!
Solution 3:
Separate the horn channel with a double pole, double throw self-locking switch, and connect a high-power resistor of about 100 ohms to the opposite knife position of the horn to discharge the impulse current. It is quite troublesome to turn on the power and then press the horn switch, but after this treatment, there will definitely be no power on impact sound again
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