Last updated: October 2026

For most hobby and student benches, the best bench power supply in 2026 is a single-channel 30 V, 5 A linear unit such as the Korad KA3005P/KA3005PS: low published noise, a real current limit and a USB port for under the price of a mid-range meter. If you need two adjustable rails for op-amps or mixed logic, a triple-output linear supply such as the Siglent SPD3303X-E or Rigol DP832 is the step up. If you need more voltage or power on a budget and can accept more ripple, a switching unit (Owon SPE series) or a Riden RD6006 module fills that role.

How we picked: compiled from manufacturer specifications, published prices and owner feedback patterns. We have not tested these tools ourselves. Our method.

Quick picks by use case

  • First supply for learning and Arduino or ESP32 projects: Korad KA3005P / KA3005PS. Linear, 0 to 30 V and 0 to 5 A, with presets and a PC interface.
  • Analog circuits that need plus and minus rails: Siglent SPD3303X-E. Two isolated 32 V / 3.2 A channels plus a fixed 2.5, 3.3 or 5 V channel, linear, at a published $459.
  • Same idea, more resolution or a different ecosystem: Rigol DP832 (three linear outputs, 195 W) or the Siglent SPD3303X (1 mV / 1 mA resolution).
  • More power for motors, LED strips or battery work on a budget: Owon SPE3103 or SPE6103, switching, 300 W.
  • Cheapest route to 60 V and 6 A, if you already have a DC source: Riden RD6006, a buck converter module that needs a separate DC input supply.

Comparison table

ModelTypeOutputs (max)Published ripple/noiseSetting resolutionPC interfacePrice snapshot
Korad KA3005PSLinear (transformer)1 x 0 to 30 V, 0 to 5 A2 mVrms or less10 mV / 1 mAUSB, RS-232about €99.50 at Botland (October 2026)
Riden RD6006Switching buck module (needs 6 to 70 V DC input)1 x 0 to 60 V, 0 to 6 A, 360 W100 mV p-p at maximum capacity10 mV / 1 mANot verifiedNot verified
Owon SPE3103Switching1 x 0 to 30 V, 0 to 10 A, 300 W30 mV p-p or less10 mV / 1 mAUSB (SCPI)Not verified
Owon SPE6103Switching1 x 0 to 60 V, 0 to 10 A, 300 W50 mV p-p or less10 mV / 1 mAUSB (SCPI)about €125 at Elektor (October 2026)
Siglent SPD3303X-ELinear2 x 32 V / 3.2 A plus 1 x 2.5/3.3/5 V / 3.2 A, 220 W totalSee Siglent datasheet10 mV / 10 mAUSB, LANabout $459 at Siglent (October 2026)
Siglent SPD3303XLinearSame as X-ESee Siglent datasheet1 mV / 1 mAUSB, LANabout $631 at Siglent (October 2026)
Rigol DP832Linear2 x 30 V / 3 A plus 1 x 5 V / 3 A, 195 W totalunder 350 µVrms / 2 mVpp10 mV / 1 mAUSB; LAN and RS-232 optionalabout $404 on sale (list $449) at Rigol (October 2026)
Rigol DP811Linear1 output, up to 40 V or 10 A, 200 WSee datasheetSee datasheetSee datasheetabout $599 at Rigol (October 2026)

“Not verified” means we could not confirm a current price from a manufacturer or major retailer page. Check the listing before you buy. Resolutions for Rigol come from a retailer listing of the DP832; Rigol sells a high-resolution option.

Linear vs switching: what actually changes

Siglent’s application note sums up the trade-off:

  • Linear supplies give a quiet, stable output with fast response. The cost is low efficiency, a large transformer, more weight and a big heat sink.
  • Switching supplies are smaller, lighter and far more efficient, but switching at kilohertz to megahertz frequencies creates electrical noise that can show up on the output.

The published ripple numbers in the table show the gap. The linear Korad and Rigol units list ripple in the low millivolts or below. The switching Owon units list tens of millivolts peak to peak, and the Riden module lists 100 mV peak to peak at full output.

When noise matters: audio circuits, sensor front ends, op-amp work and anything you will look at closely on an oscilloscope. Choose linear.

When it matters less: charging batteries, running motors, LED strips, heaters and most digital boards with their own regulators. A switching supply’s extra power per dollar is often the better deal there.

CV, CC and why the current limit is the feature that matters

B&K Precision’s technical note explains the two modes every regulated bench supply uses:

  • Constant voltage (CV): the supply holds the set voltage while the load draws whatever current it needs, up to the current limit.
  • Constant current (CC): when the load tries to draw more than the limit, the supply switches to CC, holds the current at the limit and lets the voltage drop.

The switch between them is automatic. The current limit is the crossover point.

In practice, this is what protects your circuit. Set the voltage your board needs, set the current limit a little above what it should draw, and connect it. If there is a solder bridge or a reversed part, the supply drops into CC mode, the CC indicator lights and the current stays capped instead of cooking a trace. This is the main reason to buy a bench supply rather than use a wall adapter. If you are still learning to find shorts, our continuity guide pairs well with this.

Many programmable units also add over-voltage (OVP) and over-current (OCP) protection, which switch the output off at a set threshold. Botland lists OVP and OCP for the Korad KA3005PS, Owon lists over-voltage and over-current protection for the SPE series, and the Joy-IT datasheet for the RD6006 lists adjustable over-current and over-voltage protection.

The picks in detail

Korad KA3005P / KA3005PS: best first supply

The KA3005PS listing at Botland describes a transformer-based linear design with 0 to 30 V and up to 5 A, ripple of 2 mVrms or less, 10 mV and 1 mA steps, RS-232 and USB interfaces, OVP and OCP, and five memories for saved settings. The same listing calls the PS a new and improved version of the KA3005P with better ventilation and an improved display.

Why it fits a beginner: 30 V covers nearly every hobby circuit, 5 A runs most boards and small motors, and linear noise numbers mean you will not be chasing supply ripple on a scope. One channel is the limit; for split rails you need a second unit or a multi-channel supply.

Siglent SPD3303X-E: best for plus and minus rails

Siglent lists three isolated outputs: two adjustable 32 V / 3.2 A channels and one channel selectable at 2.5, 3.3 or 5 V, for 220 W total. The two adjustable channels can run independently, in series or in parallel, and Siglent’s datasheet describes the series as linear programmable supplies. The X-E version resolves 10 mV / 10 mA and costs $459 on Siglent’s store; the SPD3303X resolves 1 mV / 1 mA for $631.

Why it fits: op-amp circuits often need a positive and negative rail. Two isolated channels in series give you that, and the fixed channel powers logic at the same time. LAN and USB with SCPI support let you script it later.

Rigol DP832: the triple-output alternative

Rigol lists the DP832 as a linear, three-channel supply with 195 W total and ripple and noise under 350 µVrms / 2 mVpp. A retailer listing gives the channels as two 0 to 30 V / 0 to 3 A outputs and one 0 to 5 V / 0 to 3 A output. Rigol’s own store showed it at $404.10 on sale from $449.00, with an 8-week shipping estimate at the time of checking. The DP832A ($619) adds Rigol’s advanced features.

Why pick it over the Siglent: price on sale, and a large ecosystem of existing users. The Siglent gives slightly more voltage and current per channel.

For more current on one channel, Rigol’s DP811 offers up to 40 V or 10 A at 200 W for $599.

Owon SPE3103 and SPE6103: most power per dollar

Owon describes the SPE series as constant-power switching DC supplies. The SPE3103 covers 0 to 30 V at up to 10 A, and the SPE6103 covers 0 to 60 V at up to 10 A, both 300 W. Owon lists 10 mV / 1 mA resolution, a USB interface with SCPI, timed output sequences and over-voltage and over-current protection. Published ripple is 30 mV p-p or less (SPE3103) and 50 mV p-p or less (SPE6103).

Why it fits: battery charging, motor drivers, LED strips and anything that needs real current. Not the first choice for sensitive analog work, for the noise reasons above.

Riden RD6006: cheapest 60 V, if you supply the input

The RD6006 is not a complete bench supply. Joy-IT’s datasheet lists an input range of 6 to 70 V DC and outputs of 0 to 60 V, 0 to 6 A and 0 to 360 W, with 10 mV and 1 mA resolution, a 2.4-inch LCD, battery charging and capacity measurement functions, and residual ripple of 100 mV peak to peak at maximum capacity. Because it steps voltage down, the output can only go as high as your input supply allows, so plan on buying or reusing a DC power brick or enclosed supply sized for the voltage and power you want.

Why it fits: builders who want 60 V and 6 A at low cost and do not mind assembling it. Beginners should pair it with an enclosed, ready-made DC supply rather than wiring an open-frame mains unit; any mains wiring belongs with a qualified person.

What to check before you buy

  1. Voltage and current range. 30 V and 3 to 5 A covers most hobby work. Go higher only for a reason.
  2. Number of channels. One for most digital projects, two isolated channels for split rails.
  3. Ripple and noise. Compare the published figures, in the same units, for your use.
  4. Setting resolution. 10 mV steps are fine for most work. 1 mV helps for precise characterization.
  5. Protection. A current limit is essential. OVP and OCP are useful extras.
  6. Interface. USB or LAN with SCPI matters if you want to log or automate tests later.

FAQ

Is a linear power supply better than a switching one? For low noise, yes. Siglent’s note lists quiet, stable output as the linear advantage and size, weight and efficiency as the switching advantage. Choose based on what you power.

What does CC mean on my power supply display? The load tried to draw more than your current limit, so the supply is holding current at the limit. B&K Precision describes this as the automatic crossover from CV to CC.

How much current do I need for Arduino and ESP32 projects? A few amps is plenty for boards, sensors and small displays. Motors and LED strips need more. Set the current limit near what the circuit should draw so faults stay small.

Can a bench supply charge batteries? Many can in CC/CV fashion, and Joy-IT lists a battery charging function for the RD6006. Follow the battery maker’s charging specification, and never leave lithium cells charging unattended.

Do I need a programmable supply? Not to start. Programmability matters when you want to log, sweep or automate tests. Several picks here include it at little extra cost.

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