Universal AC-DC Power Adapter (3V-15V, 1000mA) Multi-Plug Regulated Switching Supply (6 Tips) | PHC-1000K
Reliable, regulated power for a wide range of electronics. The PHC-1000K is a high-efficiency switching regulated universal AC-DC adapter delivering up to 1000mA (1A) of clean, stable DC power. It is an ideal modern replacement for lost or broken power supplies on household electronics, networking gear, lab equipment, and vintage hobbyist projects.
With 6 interchangeable tips, 7 selectable voltages, and reversible polarity, one PHC-1000K can stand in for a drawer full of single-purpose adapters.
Looking for Catalog 2731121 (273-1121)?
The universal 1000mA adapter once sold as Catalog 2731121 (also written 273-1121) was a go-to workbench and household supply for years, but it is no longer stocked or sold online. The PHC-1000K matches the core specifications shoppers relied on: selectable 3V–15V DC output, 1000mA capacity, interchangeable barrel tips, and switchable polarity, in a current-production, switching regulated design. Not affiliated with or endorsed by the original retailer; catalog numbers are listed for reference only.
Technical Specifications
- Part: PHC-1000K
- Input: 90–240VAC, 50/60Hz, 0.6A (Global Voltage Compatibility)
- Selectable DC Output: 3V, 5V, 6V, 7.5V, 9V, 12V, and 15V DC (Switching regulated)
- Current Capacity: 1000mA Max (1A)
- Cord Length: 6ft (Extra long for easy setup)
- Protection: Switching regulated for constant voltage output, with integrated short-circuit protection
- Polarity: REVERSIBLE (Detachable tips allow both Center-Positive and Center-Negative configurations)
What’s in the Box
- 1x PHC-1000K Universal Power Adapter
- 6x Interchangeable Barrel Tips (ID x OD):
- 2.5 x 5.5mm
- 2.1 x 5.5mm
- 2.1 x 5.0mm
- 1.5 x 5.5mm
- 1.7 x 4.0mm
- 1.35 x 3.5mm
Common Applications & Device Compatibility
This multi-voltage adapter is designed for low-voltage DC devices that require 1000mA or less at 3V, 5V, 6V, 7.5V, 9V, 12V, or 15V DC and use one of the included tip sizes:
- Wi-Fi routers, modems, and network switches
- CCTV security cameras and baby monitors
- Electronic scales and small household electronics
- Household radios, Bluetooth speakers, and TV boxes
- DIY Arduino circuits, LED light strips, and low-voltage accessories
- Vintage hobbyist electronics and legacy lab equipment
Not for devices that require AC output, more than 1000mA, or voltages outside the selectable settings. Always check your device label or original adapter first.
Frequently Asked Questions (FAQ)
Is the PHC-1000K a replacement for Catalog 2731121 (273-1121)?
Yes. It is a modern, current-production alternative with the same core ratings (selectable 3V–15V DC, 1000mA capacity, and reversible polarity). Note: While the original RadioShack adapter utilized letter-coded Adaptaplugs, the PHC-1000K uses 6 standard barrel tips (2.1mm, 2.5mm, etc.). Always verify your device's voltage, current capacity, tip size, and polarity (+/-) before connecting.
Can I use this adapter with a device that requires less than 1000mA (e.g., 300mA or 600mA)?
Yes, as long as the voltage, tip, and polarity match. The 1000mA rating is the maximum capacity; your device draws only the current it needs.
How do I select the correct polarity for my device?
Check your device or original power supply for the polarity symbol (+ ---C--- -). To set polarity on the PHC-1000K, align the tip’s polarity indicator (+ or -) with the arrow on the cable connector before plugging it in.
Is this power supply regulated?
Yes. Unlike older unregulated transformer supplies that can rise well above the labeled voltage when lightly loaded, this switching regulated adapter holds a steady output voltage across its rated load range.
Will it cause interference with an AM radio?
Some AM radios are sensitive to the high-frequency noise any switching power supply can produce, which may cause buzzing or reduced reception. For interference-sensitive AM listening, a linear (unregulated transformer) adapter may be a better fit.
My device doesn’t power on. What should I check?
Confirm the voltage selector matches your device, the tip is fully seated in both the cable and the device, and the polarity arrow is aligned correctly. If it still won’t work, contact our support team and we’ll help you troubleshoot.
⚠️ IMPORTANT: Always verify your device’s required voltage, current, tip dimension, and polarity (+/-) before connecting. Incorrect voltage or polarity can damage your device or adapter. If you need help confirming compatibility, please contact our support team.
