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

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Ps 52 kx power supply will not hold load

My power supply give you 12-14 volts but will not hold load and makes buzzing when you load it but has a good 12-14 volt out put ,

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  • runninbear33 Sep 20, 2009

    pyramid ps-52kx does not come on and puts out no power.

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Thank you for your help . I have already fixed the power supply I double checked the transisters and found three bad so I replaced all the power transisters and it is fine . thanks again bob

Posted on Nov 19, 2008

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Kicker kx850.4 protection light stays on know power light


Check power make sure you have solid 12 volts. Disconnect speakers, shorted speaker can cause protection mode to engage. If still in protect mode will need to repair. Kicker does out of warranty repairs on kx series amps or try T.I.P.S contact at linearpower.com. Iirc Ray @ tips was one of the engineers at kicker back when kx series was introduced.

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How do i stop a power acoustik pd-450 from randomly shutting off? Ive checked connections and wiring all is good, the power supply is good as well


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Pyramid PS-52KX. Getting 24 volts DC on my output. I am knowledgeable in this department. I need to know what ac voltage should I be reading off of my transformer? I can't find a good schematic...


Sounds like the regulator goin. I've read when they go bad it will go full voltage which is 37vdc.
Looks like they use the LM723 regulator. I'm no expert, but may be that simple.
Here's a link to a schematic. Hope it helps
http://www.pyramidcaraudio.com/manuals/PS52K.pdf

I have a PS14KX. It won't handle any load. If you have any ideas let me know

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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.
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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!

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2 Answers

My paeveybandit 112 is buzing when i turn it up


Check the power supply area for bad connections especially near the large capacitors. If one or more of those are disconnected, the DC voltage will have some noisy AC on it that will sound like a buzz.

Keep us posted.
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Let me know if you have any other questions.

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The problem I have had with a PS-20 is a blown capacitor. Hooked to a radio, would allow radio to receive fine, but when trying to transmit, amperage would bottom out. Behind the transformer is a large circuit board. UNPLUG POWER SUPPLY, remove cover, Undo the two nuts, flip board over, and gently rock the 4700uf capacitors side to side. If they move more than 1/16th of an inch, chances are they are blown. Remove/replace and should be good to go...

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1 Answer

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Most of Pyramid's supplies are based on the LM723 voltage regulator. The DATASHEET should tell you most of what you'll need to know to repair it. THIS is the schematic diagram.

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