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From the manufacturer
Perfectly Regulated AC to DC Power for Sensitive Applications
Get regulated, precise DC power from any AC input with Tripp Lite’s PR3UL DC Power Supply. The PR3UL efficiently converts power from an AC source to 13.8 V DC, providing perfect input for commercial/land-mobile applications, ham and CB radios, test bench supplies, base stations, tape players and amplifiers. With a solid state, integrated circuit and 3-amp capacity, the PR3UL maintains excellent output voltage regulation so no power disruptions affect connected equipment and devices function at their peak.
Product Summary:
- Efficiently converts incoming AC to 13.8 V DC power
- 3-amp capacity
- Crowbar circuit overload protection guards against overvoltages
- Large heat sinks and vented cabinet for cool operation and continuous use
- Illuminated On/Off switch with LED indicator
- Full UL certification
- 1-Year Warranty
Power Protection, Line Noise Filtering and UL-Certified
With a heavy-duty power transformer, the PR3UL completely isolates equipment from utility AC power disruptions. Current-limiting electronic foldback enables timer-controlled automatic overcurrent protection, eliminating the risk of overvoltages harming sensitive components. A crowbar circuit provides even further protection against equipment damage. An illuminated power switch offers one-touch control and an LED indicator shows DC output.
Noise disruptions on the AC line can damage equipment components and lead to failure over time. The PR3UL protects systems from line noise by filtering AC power as it converts it to DC, leading to very low noise operation. This lets DC-powered equipment maintain optimal capability while also protecting your application from incremental damage.
The PR3UL has received full UL certification for optimum safety and performance.
Compact Design and 1-Year Warranty
A combination of compact size and color harmonize the PR3UL with all modern communications equipment set ups. Its low-profile design and small footprint match the most popular radios on the market, such as Motorola, Radius, GE Monogram Series and EF Johnson models. Inside the unit, large heat sinks emit heat through the PR3UL’s vented cabinets for cool, continuous operation and long component life.
The PR3UL is backed by a one-year warranty and is manufactured in compliance with strict RoHS specifications, reflecting Tripp Lite’s commitment to environmental responsibility.
Why Choose Tripp Lite?
Founded in 1922 in Chicago, Illinois, Tripp Lite is a leading manufacturer of products to power, protect, manage, house, cool, connect and mount your equipment. From the largest data center to the smallest home office, Tripp Lite products keep your equipment running effectively and efficiently. Whether you need to supply power to servers and have reliable battery backup, connect high-resolution video sources to displays and digital signs, or organize and secure IT equipment in rack enclosures, Tripp Lite has the complete solution. Plus, before and after your purchase, our Chicago-based, in-house technical support specialists are available to assist you by phone, email and live chat. With over 90 years of quality products and service, Tripp Lite is a brand you can trust.
Reviews with images
Oldie but a goodie
My PR-3UL was made in 1987, I got it at a garage sale for cheap maybe 10 years ago. The design is a simple linear one using a 2N3055 transistor mounted on a large heatsink at the back for the final output stage so it should be able to deliver the full 3A current sustained. Internally it has a fuse on the low voltage AC side. The output voltage was a little off after all these years running at 14v instead of 13.8, not bad for all this time. There is a POT that I used to adjust the voltage, but it was pretty touchy trying to adjust. For most people the voltage probably won't be too critical anyway.The design and build quality are better than the Micronta 2.5A power supply (model 22-124) that was a popular competitor from Radio Shack in the 70's and 80's.They rarely make power supplies like this anymore due to the relatively low current for the large size and weight, and the power inefficiency. The output though is cleaner vs many of the smaller switching supplies that are typically found these days. For most people though, a switching supply will be better due to it being smaller, more power efficient, and inexpensive.For the hardware hackers, this would make a good starting point for a 5A regulated 12V bench supply. Just replace the existing regulator circuit with a 78H12A and you will have a stable low noise supply. All it would take is a couple of jumper wires and placing the regulator IC where the 2N3055 is mounted.
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Reviewed in the United States on February 21, 2015
My PR-3UL was made in 1987, I got it at a garage sale for cheap maybe 10 years ago. The design is a simple linear one using a 2N3055 transistor mounted on a large heatsink at the back for the final output stage so it should be able to deliver the full 3A current sustained. Internally it has a fuse on the low voltage AC side. The output voltage was a little off after all these years running at 14v instead of 13.8, not bad for all this time. There is a POT that I used to adjust the voltage, but it was pretty touchy trying to adjust. For most people the voltage probably won't be too critical anyway.
The design and build quality are better than the Micronta 2.5A power supply (model 22-124) that was a popular competitor from Radio Shack in the 70's and 80's.
They rarely make power supplies like this anymore due to the relatively low current for the large size and weight, and the power inefficiency. The output though is cleaner vs many of the smaller switching supplies that are typically found these days. For most people though, a switching supply will be better due to it being smaller, more power efficient, and inexpensive.
For the hardware hackers, this would make a good starting point for a 5A regulated 12V bench supply. Just replace the existing regulator circuit with a 78H12A and you will have a stable low noise supply. All it would take is a couple of jumper wires and placing the regulator IC where the 2N3055 is mounted.
The design and build quality are better than the Micronta 2.5A power supply (model 22-124) that was a popular competitor from Radio Shack in the 70's and 80's.
They rarely make power supplies like this anymore due to the relatively low current for the large size and weight, and the power inefficiency. The output though is cleaner vs many of the smaller switching supplies that are typically found these days. For most people though, a switching supply will be better due to it being smaller, more power efficient, and inexpensive.
For the hardware hackers, this would make a good starting point for a 5A regulated 12V bench supply. Just replace the existing regulator circuit with a 78H12A and you will have a stable low noise supply. All it would take is a couple of jumper wires and placing the regulator IC where the 2N3055 is mounted.
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Reviewed in the United States on March 18, 2019
