9V AC-DC Linear Power Supply, 1000mA (1A), Negative Center | PV-91A
Original price
$15.00
-
Original price
$15.00
Original price
$15.00
$15.00
-
$15.00
Current price
$15.00
The Part PV-91A is a heavy-duty, traditional AC-DC linear power supply providing a 9VDC output at a maximum current of 1000mA (1A). Built as a robust, non-regulated transformer block, it delivers dependable, low-noise electrical performance for compatible electronic devices, audio gear, and project builds.
Key Features & Specifications:
- Linear & Non-Regulated Design: Utilizing a classic copper-wound transformer design, this unit provides raw, durable linear power. Note: As a non-regulated power supply, the output voltage will naturally sit higher than 9V under no-load conditions, settling to 9VDC as it approaches its nominal 1000mA load.
- Output Performance: 9VDC @ 1000mA (1 Amp max continuous output).
- Input Voltage: Standard 120VAC, 60Hz domestic input configuration.
- DC Plug & Polarity: Terminated with a standard 2.1mm x 5.5mm barrel plug featuring a strict Center-Negative ( - ) polarity configuration.
Typical Technical Applications:
- Audio & Music Gear: Because linear power supplies do not use high-frequency switching circuits, they generate minimal Radio Frequency Interference (RFI), making this model well suited to compatible 9VDC center-negative audio equipment. Confirm your device's voltage tolerance, current draw, and plug size first.
- Vintage & Replacement Power: Replacement transformer for legacy electronics and consumer devices built for unregulated, center-negative 9V power at 1000mA or less.
- Laboratory & DIY Testing: A dependable component for electrical engineering benches, custom hobby projects, and school laboratories requiring traditional unregulated DC power curves.
Important Compatibility Notes:
- Polarity Warning: This adapter is strictly Center-Negative ( - ). Double-check your device's power port requirements before purchasing, as using this adapter with a center-positive device can cause damage.
- Unregulated Output: Some devices, including many effects pedals, prefer regulated 9V power. Check your device's manual before use.
Frequently Asked Questions
What plug size and polarity does the PV-91A use?
A standard 2.1mm inner diameter x 5.5mm outer diameter barrel plug with center-negative ( - ) polarity. The inner pin is negative and the outer sleeve carries the positive 9V.
Why does my meter read more than 9V with nothing plugged in?
That is normal for a non-regulated linear supply. Output voltage sits above 9V at no load and settles toward the nominal 9VDC as the load approaches its rated 1000mA.
Why choose a linear supply instead of a switching supply?
Linear supplies use a copper-wound transformer instead of high-frequency switching circuits, so they generate minimal RFI, a good fit for noise-sensitive audio and radio equipment.
Can I use this on a device that draws less than 1000mA?
Yes. Devices draw only the current they need. Because this is an unregulated supply, a lightly loaded device will see slightly more than 9V, so verify your device's voltage tolerance.
Will this work on 220-240V power outside North America?
No. The PV-91A is built for standard 120VAC 60Hz domestic wall power only.
What happens if I use the wrong polarity?
Reversed polarity can damage connected equipment. Always match your device's polarity symbol to the center-negative marking on this supply before plugging in.
