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Power Supplies

Compiled by Robert Meister WA1MIK
Web page maintained by Robert Meister WA1MIK
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Click here or the icon above for the Pyramid Car Audio web page
then enter "power supply" in the search box at the top of the page.


While the above web site has their products, it seems to be totally crippled. None of their emails work any more and most of the clickable items result in "Page Not Found" errors. Their products are being sold by "Quality Car Audio" and it would seem that they're trying to get rid of a LOT of Pyramid stock, as there are deep discounts on their web page: https://www.qualitycaraudio.com/.

I found that product support has been taken over by https://www.pyleusa.com/ and they too are offering deep discounts on Pyramid products.

The Pyramid linear regulated power supplies are very similar to the Astron RS/VS series. They're based on the popular LM723 voltage regulator IC and use multiple high-power series-pass transistors to supply current to the load. Some people say the Pyramids are engineered better. The larger supplies have regulator circuitry that's almost identical to their Astron cousins. Pyramid ammeters measure the voltage drop across a single shunt resistor in series with the positive output, whereas Astron ammeters measure the drop across one of the series-pass transistor emitter balancing resistors. This makes the Pyramid ammeter track the actual load current much more accurately, especially if one of the series-pass transistors fails.

Power Supply Manuals:

The numerical value in the model number indicates the peak intermittent current capability. Some model numbers have "K" for the suffix while others have "KX". The support group told me "PS-nnK supplies are the older version. The updated version assembled by our new factory is PS-nnKX. The boards themselves are different but both models share the same specs." Astron uses suffix letters to indicate metering, battery back-up, and other options; not so with Pyramid. Some supplies always have meters while others never do. TENNA seems to be a brand name associated with the Phase III products; it may have been bought by Pyramid.

PS-3KX 3A Regulated Power Supply   215 KB PDF file
Has schematic with parts values.
PS-4KX 4A Regulated Power Supply   215 KB PDF file
Has schematic with parts values.
PS-7KX 7A Regulated Power Supply   215 KB PDF file
Has schematic with parts values.
Tenna PS-7 7A Regulated Power Supply schematic
PS-8KX 8A Regulated Power Supply   215 KB PDF file
Has schematic with parts values.
PS-9KX 9A Regulated Power Supply   275 KB PDF file
With cigarette jack and schematic with parts values.
PS-12K 12A Regulated Power Supply   338 KB PDF file
Has schematic with parts values.
PS-14K 14A Regulated Power Supply   356 KB PDF file
Has schematic with parts values.
PS-15K 15A Regulated Power Supply   347 KB PDF file
Has schematic with parts values.
Tenna PS-20 20A Regulated Power Supply schematic
PS-21K 21A Regulated Power Supply   277 KB PDF file
With ammeter and schematic with parts values.
PS-25 "Phase III" 25A Regulated Power Supply   44 KB PDF file
With ammeter, voltmeter, crowbar, and overload indicator (buzzer). Has schematic but no parts values.
PS-26KX 26A Regulated Power Supply   349 KB PDF file
With ammeter, voltmeter, crowbar, DC fan, and overload indicator (buzzer and LED). Has schematic with parts values.
PS-32LAB 30V 5A Lab Power Supply   260 KB PDF file
No schematic.
PS-35 "Phase III" 35A schematic only   16 KB PDF file
With ammeter, voltmeter, and crowbar. No parts values. See the PS-25 "Phase III" manual above as it's nearly identical.
PS-36K 36A Regulated Power Supply   325 KB PDF file
With ammeter, voltmeter, crowbar, and DC fan. Has schematic with parts values.
PS-46KX 46A Regulated Power Supply   220 KB PDF file
With ammeter, voltmeter, and crowbar. Has schematic with parts values.
PS-52K 52A Regulated Power Supply   332 KB PDF file
With ammeter, voltmeter, crowbar, and DC fan. Has schematic with parts values.
PS-52KX 52A Regulated Power Supply   100 KB PDF file
With ammeter, voltmeter, crowbar, and DC fan. Has schematic with parts values.
PS-64KX 64A Regulated Power Supply   216 KB PDF file
With ammeter, voltmeter, crowbar, and AC fan. Has schematic with parts values.
PSV-40 3A Switching Power Supply   225 KB PDF file
With cigarette jack. No schematic, which is typical of switching power supplies.
PSV-200 3A Switching Power Supply   133 KB PDF file
No schematic, which is typical of switching power supplies.
PSV-300 30A Switching Power Supply   404 KB PDF file
No schematic, which is typical of switching power supplies.


Pyramid Power Supply Feature Matrix:

Key to Columns:

Model NumberSchPLVMAM FanCBOLICJ
PS-3KX 3AYesYes        
PS-4KX 4AYesYes        
PS-7KX 7AYesYes        
PS-8KX 8AYesYes        
PS-9KX 9AYesYes       Yes
PS-12K 12AYesYes        
PS-14K 14AYesYes        
PS-15K 15AYesYes       Yes
PS-21K 21AYesYes  Yes   Yes 
PS-25 "Phase III" 25AYes  YesYes  YesYes 
PS-26KX 26AYesYes YesYesYes YesYes 
PS-32LAB 30V 5A Lab PS   YesYes   Yes 
PS-36K 36AYesYes YesYesYes YesYes 
PS-46KX 46AYesYes YesYes  Yes  
PS-52K 52AYesYes YesYesYes Yes  
PS-52KX 52AYesYes YesYesYes Yes  
PS-64KX 64AYesYes YesYesYes Yes  
PSV-40 3A Switching PS         Yes
PSV-200 3A Switching PS          
PSV-300 30A Switching PS          


Pyramid Power Supply Articles:

PS-15KX Regulated Power Supply Evaluation   by Robert Meister WA1MIK
Build quality and load testing.
PS-21KX Regulated Power Supply Repair   by Rich Post KB8TAD (offsite link)
Includes theory and circuit analysis.
PS-25 (Phase III) Regulated Power Supply Repair   by Rich Post KB8TAD (offsite link)
Includes theory and good troubleshooting information.


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This page initially created 12-Sep-2015 from Other Mfgrs.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.