Current Limit

Constant-current mode caps the current, so a fault shows up as the supply backing off rather than a part overheating.

Linear or Switching

Linear means low noise for audio, analog and radio work. Switching means more power in a smaller, lighter box.

Display Resolution

A 1 mA readout reveals small standby currents; a 10 mA readout is fine for general work.

Presets and Output Button

Store your usual voltages and only switch the output on once you’ve checked the setting.

Remote Control

USB or Wi-Fi control enables logging, automated tests and battery-charging profiles.

The KA3005D is a favourite first “serious” supply, sold under several brand names. It’s linear and quiet, with a 4-digit display that resolves 10 mV and 1 mA, a single knob with coarse and fine selection, and four memory buttons for the rails you use most. Over-voltage, over-current and thermal protection are built in, and the input switches between 110 V and 220 V. It usually costs more than the switching units here and has no PC control (that’s the KA3005P), but it’s a precise supply that stays on a bench for years.

The RD6006W gives makers lab-style features for little money. It outputs 0–60 V at up to 6 A with 10 mV and 1 mA resolution, and connects to PC software over USB or to a phone app over Wi-Fi, so you can log current over time, script voltage sweeps or run a battery-charging profile. It’s the control module only: you’ll need a DC input supply (higher than your maximum output voltage) and ideally a case, so budget for the complete build.

The DP100 fits in your palm yet gives you an adjustable 0–30 V, 0–5 A output with fine resolution. It runs from a USB-C PD charger, power bank or laptop adapter, which makes it ideal for small desks, maker spaces, field repairs and travel. The catch is the 100 W ceiling (and whatever your charger can supply), so it can’t deliver full voltage and full current at once. As a second supply or a take-anywhere tool, it’s excellent.

The SPS-3010 is one of the most-bought bench supplies on Amazon, and for good reason. It’s a compact switching unit that delivers 0–30 V at up to 10 A, with a 4-digit display showing voltage, current and live power in watts. It switches automatically between CV and CC, has coarse and fine knobs and a handy USB port. It uses potentiometers rather than encoders and has no presets or output button, but its long review history speaks for its reliability.

Most budget switching supplies skip the two features that prevent accidents, and this one includes both: an output on/off button and three memory presets. Store your common rails, preview the setting, then switch the output on. It also has an encoder knob, a combined V, A and W display, a short-circuit alarm and a quick-charge USB port. Output is limited to 5 A and it’s a lesser-known brand, but for anyone who swaps between boards with different voltages all day, it’s the safest budget option.

The DPS3005 started the DIY digital-supply trend. Feed it 6–40 V DC from a laptop brick or an enclosed supply and you get an adjustable 0–32 V, 0–5 A output, set in 10 mV and 1 mA steps, with 10 memory groups and programmable protection limits. You’ll need to provide the DC input and an enclosure, and this version has no PC control, but if you already have a suitable adapter, it’s the cheapest way to a precise digital supply.

Audio, analog and radio

A linear supply: the Tekpower TP3005T or Korad KA3005D.

Motors, LEDs and 12 V loads

A 10 A switcher: the Wanptek DPS3010U or Jesverty SPS-3010.

Logging and automation

The Riden RD6006W with PC and app control.

Small desk or travel

The USB-C powered Alientek DP100.

Swapping between rails all day

The NANKADF with presets and an output button.

Tightest budget

Build around the DPS3005 and a spare adapter.

Linear or switching: which should I buy first?

If you work on audio, sensors, analog circuits or radios, start with linear for its clean output. If you mostly power microcontroller boards, motors and LED strips, a switching supply gives you more current for less money and weight. Many people end up with one of each.

Is 30 V and 5 A enough?

For nearly all hobby electronics, yes. Microcontroller boards draw well under 1 A, and 30 V covers 12 V and 24 V systems. Choose 10 A for motors, LED strips and heaters, and 60 V for higher-voltage battery packs.

What do I need to use the RD6006W or DPS3005?

A DC input supply whose voltage is somewhat higher than the highest output you want and that can deliver enough power, plus a case for safety. A laptop adapter works for lower outputs; for full output you’ll want a suitably rated enclosed switching supply.

Can I charge batteries with a bench supply?

Constant-voltage, constant-current is how lithium cells are charged, so a bench supply can do it with care: set the cell’s full-charge voltage and a safe current, and stop when the current tapers off. Never leave lithium cells charging unattended, and use a proper charger or battery management system for multi-cell packs.

How accurate are budget supply displays?

Good enough for everyday work, but treat them as approximate. Check critical voltages with a good multimeter; our multimeters guide has options for every budget.