RF4 RF-305A Multifunctional Adjustable DC Power Supply with Short Killer Function (30V / 5A)

Every serious repair shop in Pakistan runs on two things — a good soldering station and a power supply you can actually trust. When you're dealing with a dead phone that won't boot, a charging issue that keeps coming back, or a motherboard with a hardware fault you can't pin down, your DC power supply is the first tool that goes on the bench. The RF4 RF-305A is built specifically for that role — a multifunctional, adjustable power supply that pairs precision output control with an integrated Short Killer function, making it one of the most practical units available for professional GSM technicians.

The output range on the RF-305A covers 0 to 30V on voltage and 0 to 5A on current, both continuously adjustable. That range gives you the flexibility to run everything from low-voltage IC testing at 1.8V or 3.3V all the way up to battery charging simulation at 4.2V and beyond. When you're doing jumper lagana on a PCB or checking a charging path after IC change karna, you need your power supply to hold exactly the voltage you set — not drift, not spike, not guess. The RF-305A delivers that stability through tight load regulation: ±(0.01% + 3mV) on voltage and ±(0.01% + 3mA) on current, with output ripple kept below 1mVrms on voltage and 3mArms on current.

The Short Killer (SK) mode is what separates the RF-305A from basic power supplies. When you suspect a board has a short — maybe the phone pulls full current the moment you connect power, or your multimeter is showing near-zero resistance across supply rails — you switch to SK mode, dial the current limit down, and connect the board. The RF-305A sends controlled current into the short path, heating the faulty component enough to identify or resolve it without burning the board. You can run this in single or continuous mode depending on how the fault behaves. For any technician who handles dead-after-flash phones, water damage boards, or charging fault diagnosis regularly, this feature alone makes the RF-305A worth having on the bench.

Precision display readouts give you real-time monitoring of both voltage and current simultaneously. Voltage resolution sits at 10mV and current resolution at 1mA — dropping to 2mA when the rated current exceeds 3A. That level of precision matters when you're testing a device that draws milliamp-level current in standby, or when you need to catch a micro-short that only shows up as a 5–10mA spike over baseline. Four memory preset slots (A, B, C, D) let you save your most-used voltage and current combinations. If you box chalana regularly for Android or iOS diagnostics, you can pre-save your 3.7V/0.5A battery simulation setting and pull it up with one button instead of re-dialing every time.

Protection is triple-layered: overcurrent protection, overvoltage protection, and overtemperature protection work together to prevent damage to both the unit and whatever device you have connected. The built-in cooling fan ensures sustained operation during long diagnostic sessions without thermal throttling. Input accepts both 220V±10% 50Hz and 110V±10% 60Hz, making it compatible with Pakistan's standard power grid. Total output power is rated at 150W, which comfortably covers all mobile repair workloads. The temperature coefficient is rated across 0–40°C, covering the full range of workshop temperatures you'd typically work in.

Build quality on the RF-305A reflects RF4's focus on professional repair tools. The chassis is compact enough to fit a busy repair bench alongside your hot air station, microscope, and PCB holders without taking over your workspace. For technicians who use a power boot cable like the iBoot FPC+ or similar tools for iOS and Android boot testing, the RF-305A pairs cleanly — you set the voltage, clamp the boot cable to the battery terminals, and watch current draw tell you exactly what the board is doing. No guesswork, no wasted time.

If you're building out or upgrading your workshop, the RF4 RF-305A fits into every diagnostic workflow: short detection, charging path testing, boot diagnostics, PCB power testing, and IC verification. Pair it with a quality multimeter, your soldering station, and a PCB holder fixture, and you have the core of a capable hardware fault bench.