Question about Pyramid - PS21KX 20 Amp Power Supply Car Audio Amplifier

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I have one of the older 20 amp supplys it has 24 volts dc output instead of 13.8 volts this took place after a storm it has 5 2n3055 transistors that might be the trouble any ideas

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Yes. Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

i have one of the older 20 amp supplys it has 24 - helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_10.png

Posted on Feb 10, 2018

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SOURCE: Pyramid PS-21K Power Supply HELP!

check the resistors that bias the transistors, and also any zeners connected to them.

Posted on Jan 02, 2009

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I would like to charge my 930 T on 120 volt A C adapter


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What is the cprimary load on a 12volt to 240 volt 300watt inverter


Ohm's law tells us that: volts = amps x resistance and watts =volts x amps. Watts (300) = volts (240) x Amps (?); or 300 / 240 = 1.25 Amps That means the inverter can supply up to 1.25 Amps to a 240 volt load.

The primary is 12 volts, this is just 1/20th of the secondary 240 volt output. Since the best you can ever get is 100% efficiency -this means you'll need to supply 20 times the current. 1.25 Amps (at 240V) x 20 = 25 Amps (at 12V). As a check, from above Ohm's law that states Watts=Volts X Amps we get: 12VDC x 25Amps = 300Watts. Check!

Some side notes. The Ohms law used above is for DC circuits and purely resistive loads on AC circuits. I do not know what your 1.25 A @ 240VAC load is - but I suspect it won't be purely resistive. Also, since we're working with an electronic inverter as opposed to a transformer and DC rectifier there are some things that push losses higher. You might need to provide a 30 Amp 12 VDC source voltage in order to provide the 1.25A @ 240VAC output. Lastly, I wouldn't not run the output at maximum for long periods of time - or at all. 1 Amp @ 240VAC would be much better.

I hope this answered your question & good luck! Please rate my reply - thank you.

Mar 09, 2011 | Electronics - Others

1 Answer

What is the power output in a power amp and is it expensive


the output transistors are 5 to 10 bucks each for most.there are 2 or 4 on each channel,depending on brand .some high end amps have 10 transistors on each channel.mosfets are a different story as they run 20 to 50 bucks each and there is 2 or 4 on each channel.some amps use a big IC instead of transistors.those have 16 to 24 pins and are easy to change. Those IC are 25 to 75 for a stereo one like stk4141 etc.since most yamaha amps are dc coupled,when the output transistors go,they take out the driver transistors as well.If you replace the outputs and the drive transistors are shorted,they will blow the outputs again.

Apr 14, 2010 | Yamaha P3500S Amplifier

1 Answer

Have a 24 volt dc motor. (34 amps) Supply is 24


Hi, you should not have to, the motor spec is max current draw, maybe when stalled, the supply is a theoretical maximum so you will be fine, in case of faults a breaker or fuse rated at 35 amps would be good.

Mar 12, 2010 | Cycling

1 Answer

20-Volt DC Power Supply instead of 12-Volt amp


Here's a few things that come to mind. An auto charging system will operate normally from about 11 Volts to about 14.5 Volts, depending on what is operating (lights, blower,etc), and whether the vehicle is at idle or not. Most car amps will operate from about 10.5 to 16.5 Volts, and outside that range, they will probably shut down.
Another consideration is your 20 volt power supply. You didn't mention if it is a DC power supply, but it needs to be. The other factor is its output, meaning its amperage rating. I'm figuring it will need to put about 5 amps, at the least, for the Sony to put out some watts. I think the line fuses of the Sony are rated @ 25 amps each.
I don't like this type of situation, because I want to say 'try it and see what happens" and I want to say 'don't do it, something may blow".
If you decide to try the 20Volt power supply, maybe if you put smaller rated fuses (say 10 amp) in the Sony amp, they will act as a fail safe. Good luck!

Jul 26, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

2 Answers

Mackie 1200/1400 blows all 4 10 amp fuses


missmatched impedance, insufficient ground, blown transistor.

Jul 20, 2009 | Bob Mackie Mackie M-1400i Power Amplifier...

1 Answer

Two car batteries @ 24-volt, would like to go to 15-volts


Hello j37p,

You will need a thing called a "DC to DC Converter". Here's a link to one place that makes them: http://www.powerstream.com/
One model they have is the PST-D24/12-800. It will accept 20-28V input and has an adjustable output from 12.5-15.5V.

I'm hoping that you are not planning on trying to charge 3 batteries with your vehicle alternator. You would not want 2 12V batteries in series anywhere near the vehicle electrical system. They would definitely burn stuff up. You'll also want to be thinking about how to keep the dc converter and your amp(s) cool. Believe me, they will be getting hot and require some serious airflow.

Hope this helps.

Apr 14, 2009 | Car Audio & Video

1 Answer

AVR-1603 - no Sound exept over Headphones is a weak signal


First check the outputs at the output fets/transistors for any DC voltage. Reference your voltmeter to the speaker - terminal. If there is ANY DC offset, the amp is shutting down the outputs to protect your speakers from DC. Is the power supply + and - 47 volts? If only one supply is there That is your problem because the supplies should be symmetrical. Also look for any wiring problems from the amp to your speakers... any shorts? Try disconnecting all your speakers to totally eliminate any speaker problem and see if the relays still click. You should hear only ONE click when you first turn the amp on (delay of about 2-5 seconds). If they keep clicking the amp outputs are next. Also, is there any indication on the front panel of what is failing?

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