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Amplifier blowing Hi I live in a complex where we are experiencing load shedding. Every time this happens it apparently blows an amplifier for the aerials. Is there anything we can do to prevent this?

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  • AKAJACK Feb 12, 2008

    South Africa, Standard TV aerial amplifier used in complexis to boost the signal throughout the residents. LA 45 is what I have been given.

  • Albert Nika May 11, 2010

    What country are you in? What amplifier are you referring to?

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Looking up South African voltages, they vary from 220 - 250 volts at 50 cycles.
You probably also have voltage spikes from sudden load changes within the complex (air conditioners, washing machines, dryers, etc.

I suggest your complex invest in a good voltage regulator transformer. It should not need to be rated more than about 500 watts. I would guess the cost to be about $150-200 USD.

If this is more than you want to spend, try a spike suppressor, power strip first.

Posted on Feb 12, 2008

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I have an elesis RA 500 it blows the slow blow fuse when i plug it in .any ideas what is wrong?


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it sounds like the internal transformer has gone.
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SAME THING RECENTLY HAPPEN WITH ONE OF MY BITS OF KIT ...... for heavens sake don't just keep changing the fuse time and time again.

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I was doing a party iconnect the mic to mixer, they star to talk paralell with music and blow the upper part of speakers, they sound but not any treble


Hi,
What happened is that the tweeter is blown. or a fuse in the speaker that goes to the tweeter has blown. Hopefully that is it.
There are several causes. Here is the theory so you understand how to match an amplifier to a speaker system.
Tweeters have a much lower capacity for amplifier power then woofers do. All professional speakers as well as home speakers reflect this.
You may ask exactly what blew the tweeter?
Usually what destroys the tweeter is not amplifier power but distortion. If someone is overloading the microphone, or the microphone is not trimmed to the mixer. You get distortion. This distortion is what caused the tweeter to blow. The signal must be clean. If you put too much power in, it may survive OK but if you put distortion in, it will more likely blow.
It is no shame for this to happen. I have had it happen to me when mixing a live show. You just have to watch what is happening and not turn things up too loud so the mixer or the amplifier distorts.
Also when doing sound work, the ears of an engineer naturally lower the perception of loudness. Engineers often keep turning up the equipment up more and more during a performance because they have lost the perception of loudness that was there when they started. That is also the reason that many professional studio musicians and drummers loose much of their hearing at an early age.
Hope this helps,
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I parelled one 15" q power subwoofer to my brideged pioneer amp.The amp got really hot and blew a fuse.How should I wire my dvc subwoofer to the briged amp.


Hello sir, hi, YOU DON'T bridge no more speakers, this upsets the impedance load of the amp. to install another sub-woofer, get another amplifier. You may have damaged your power amplifier, If you experience repeated fuse blows, your power amplifier is now SHORTED. This needs IC amplifier replacement.

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Im a dj and i keep blowing one channel on my amp it has happened on a 3 differant amps now


Hi.

Check speaker wiring. An amp final channel usually blows because of excessive draw from speakers. This often happens because one of the speaker is shorted inside or because of a wiring problem.
Also ensure that speakers are responding to specifications. Speakers that are out of the amp Ohms range will do the same thing in a while.

Naturally you can also blow an amp final by pumping volume to the max for a while. The transistors or the STK ICs in the final section will overheat and blow.

Regards.

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Hi,

That must be the inrush current.
Maybe you are using the wrong fuses.
Please check if those are fast or slow types.
You need slow types.

Good luck,
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I have an spl gorilla series 1250watt amp that blows fuses


REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL BLOWS THE FUSE, THEN IT WILL NEED TO BE SERVICED. IF IT BLOWS THE FUSE BEFORE TURNING IT ON, THEN YOUR PROBLEM IS IN THE POWER SUPPLY SECTION. IF IT BLOWS THE FUSE AFTER ATTEMPTING TO TURN IT ON, THEN YOUR PROBLEM IS PROBABLY IN THE OUTPUT SECTION. ALSO KEEP IN MIND THAT THE P1'S ARE REALLY NOT RATED FOR THAT MUCH POWER AND YOU MAY HAVE DAMAGED THE VOICECOILS. BEFORE REINSTALLING THE AMPLIFIER, MAKE SURE TO CHECK THE SPEAKERS FOR SHORTED VOICECOILS OR YOU WILL POSSIBLY DAMAGE THE AMPLIFIER AGAIN. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

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I have a 25 wat fuse in my power wire connected to my amp and i keep blowing it. should i put a bigger fuse in it?


Hello grabert205,

You do not say if the fuse blows immediately upon powering up or while the amplifier is operating. If it blows immediately, I'd check the power and ground.

If it is blowing the fuse while operating, I'd try a 30A and see if it holds. At maximum output of 100 watts times 4, the amplifier needs about 31 amps of current at 12.8V. So driving it hard could certainly blow a 25A fuse.

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Amp


Hi, The fuse blows due to a fault in the circuitry which can be: the final transistor pairs or in the DC to DC converter (if it is present) or shorted reverse protection diode (which only happens when the amp is wired wrong even if for just an instant). In any event, it would require going inside. You have to be familiar with component level repair to correct the problem, otherwise it would be best to have an electronics technician have a look at it. Hope this be of some help and pls post again how things turn up. Good luck and kind regards.

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