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Ultra-Low-Noise Isolated USB Power Supply 230AC 5V/3A
Ultra-Low-Noise Isolated USB Power Supply 230AC 5V/3A
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Low-Noise Isolated 5 V USB Power Supply (Switchable)
Clean power in, quiet RF out.
This low-noise, mains-isolated 5 V USB power supply is designed specifically for noise-sensitive RF equipment like hotspots, SDR receivers, and shack accessories. Unlike generic phone chargers, it is engineered to keep switching hash, cable-borne RF, and ground junk out of your DC feed — helping preserve receiver sensitivity and audio quality in real-world installations.
It’s an ideal choice for permanent 24/7 setups where power quality matters as much as antennas and filtering. And when you want the station truly off, you can fully disconnect via the built-in mains switch.
Included
- Fully assembled & tested unit — ready to use
- AC power cable
* USB cable not included.
How It Works
The supply starts with a high-isolation AC/DC conversion stage that provides a regulated 5 V rail with very low leakage — reducing the common-mode noise paths that often sneak into sensitive receivers. From there, the output is conditioned with a wide-band decoupling network and a 3‑terminal feed-through EMI filter placed right at the USB connector. This “filter-at-the-exit” approach helps stop high-frequency noise before it can ride on the cable and enter your equipment.
For additional RF hygiene, the USB shield is referenced with an RC network: capacitive coupling helps shunt RF to ground, while a high-value resistor provides a static/charge bleed — improving stability without forcing a hard shield-to-ground bond.
RF-Focused Features
- Regulated 5 V DC output for USB-powered station gear
- 3 A continuous capability (15 W) for hotspots, single-board computers, and accessories
- Wide-range mains input for worldwide use (no external brick needed)
- Reinforced isolation to help reduce ground-coupled noise paths
- Connector-side EMI filtering using CAPACITY feed-through technology
- Output status LED for instant “power present” confirmation
- Mains on/off switch to fully disconnect the supply when needed
- Fused input for additional safety and fault protection
Specs at a Glance
| Parameter | Specification |
|---|---|
| Output Voltage | 5 V DC |
| Continuous Output Current | 3 A |
| Output Power | 15 W |
| Ripple & Noise (max.) | 150 mVp-p (20 MHz bandwidth measurement method) |
| Efficiency (typ.) | 85.5% |
| Line Regulation | ±0.5% |
| Load Regulation | ±0.5% |
| AC Input Voltage Range | 80 – 264 VAC |
| AC Input Frequency Range | 47 – 440 Hz |
| No‑Load Power Consumption | < 0.075 W |
| Inrush Current (typ.) | 20 A @ 115 VAC / 45 A @ 230 VAC (cold start) |
| Hold‑Up Time (typ.) | 40 ms @ 230 VAC / 10 ms @ 115 VAC (full load) |
| Isolation (Input ↔ Output) | 4 kVAC withstand (reinforced isolation class) |
| Touch Leakage Current (max.) | < 80 µA @ 264 VAC |
| Protection | Short circuit / overload (hiccup) / over-voltage / over-temperature (auto recovery) |
| Over‑Voltage Protection Level | 5.8 – 6.8 V (output shutdown + clamp behavior) |
| Operating Temperature | -40 to +85°C (derating applies at high temperature) |
| USB Output Connector | USB Type‑A receptacle (power output) |
| Power Switch | Integrated mains on/off toggle switch |
| USB Connector EMI Filter | 3‑terminal feed-through capacitor filter: 1.0 µF ±20%, 16 VDC, 4 A rated current, insulation resistance ≥ 500 MΩ, -40 to +85°C |
Typical Uses
- RF hotspots and gateways (quiet 5 V feed)
- SDR receivers and panadapters
- USB-powered shack accessories and control interfaces
- Single-board computers used near radios
- Noise-sensitive audio chains powered from USB
* Tip: For best results, use a short, good-quality USB cable and route it away from RF feedlines and antenna cabling. This supply reduces conducted noise on the DC line, but radiated pickup is still possible if cables run through high-field areas.
Mini-FAQ
- Is this a phone fast-charger / USB‑PD supply? — No. It provides a clean, regulated 5 V USB power output (designed for RF gear and hotspots).
- Does it carry USB data? — It’s intended as a power supply. (Data lines are not used.)
- Can I run it 24/7? — Yes, it’s designed for continuous operation in permanent installations.
- Can I fully turn it off? — Yes. The built-in mains switch disconnects the supply from AC input.
- Will it remove all noise in my station? — It targets noise conducted on the DC line and cable-borne RF. Good grounding, bonding, and cable routing still matter.
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