10 Best Function Generators for Hobbyists (October 2026) Guide

A function generator is the instrument that puts a known signal into a circuit so you can see what comes out. Pair one with an oscilloscope and you can sweep an audio amp across the audio band, align a vintage radio, or watch a microcontroller blink at a frequency you chose rather than one the circuit decided on its own.

Over six weeks we worked through ten of the most requested best function generators for hobbyists options, checking the spec sheets against what these boxes are actually used for on a home bench. Some of them surprised us. A couple quietly disappointed us. The differences that matter most turned out to be nothing to do with headline bandwidth.

Last updated: October 2026. Written by the prohibitiondenver bench team.

Top 3 Picks for Hobbyist Benches in 2026

All 10 Function Generators Compared in 2026

Check Your Oscilloscope First – You May Already Own a Generator

No, a function generator is not the same as an oscilloscope, and one does not replace the other. A scope shows you a voltage over time. A generator decides what voltage and frequency go into the thing you are testing. Many mid-range and better scopes ship with a built-in generator output, and if yours has one you may already own half the bench you need.

The catch is model naming. Scopes are frequently sold in closely named variants where one includes a generator output and a near-identical sibling does not, so you have to check the exact datasheet and option list rather than assume from the family name. Our advice is to look at the rear panel for a second BNC and check the manual’s block diagram before buying anything.

Built-in generators are fine for sine, square and triangle at low frequencies, which covers many first projects. They rarely give you two independent channels, deep arbitrary waveform memory, a sweep you can trigger, or remote control from a PC. Those four gaps are exactly where the standalone units below pull ahead.

If your scope has no generator and you are still choosing one instrument, our hobbyist microscope guide covers the other tool that ends up on the same bench.

1. Siglent SDG2042X – 40 MHz Dual Channel With 16-Bit Resolution

The SDG2042X is the strongest overall pick in this group because it combines real laboratory features with the widest owner record here. At 4.7 stars across 154 ratings it also carries far more user evidence than most of the boxes on this list, which matters when you are trusting something to feed a signal into a circuit you care about.

The 16-bit vertical resolution is the headline spec. Compared with the 14-bit parts further down this list, that extra resolution gives you a quieter noise floor, which means smaller signals stay usable when you are characterising a filter or hunting ripple on a power rail. The capacitive touch screen makes dual-channel setups far quicker to change than a row of buttons.

Owners upgrading from older bench units describe it as a professional workhorse and use it for ham radio alignment, SSB two-tone testing and IF injection. TrueArb handles arbitrary waveforms and Easy Pulse handles fast edges, so pulse-shaped work does not fall back to the slow square wave output.

USB and LAN let you script the generator from a PC alongside your scope, which turns a frequency response sweep from a hand-cranking exercise into something you can automate. That single capability is why this unit earns the top spot for anyone doing serious filter or amplifier work.

Who this suits

If you restore amplifiers, build filters, or run any experiment where you want your generator and scope on the same computer, this is the one. Sixteen bits of resolution and remote control are the two features you will miss on everything cheaper here, and 40 MHz of sine covers audio, LF radio and most digital timing work without straining.

Who should skip it

Skip it if your work is purely audio and you have no plan to script anything. The bundled EasyWave software is Windows only and reviewers repeatedly single it out as the hardest part of the instrument, and the manual barely explains the difference between DDS mode and TrueArb mode. Budget that learning time before you buy.

2. Koolertron 15 MHz DDS – Dual Channel With the Biggest Review Base

The Koolertron is our best value pick and the most proven unit on this list. At 473 ratings averaging 4.4, it has roughly ten times the owner history of the premium instruments here, and that body of feedback is consistently positive about stable output and useful measurement functions.

Storage is where this box quietly outshines dearer rivals. It holds 99 groups of instrument state so you can recall an exact setup later, plus 60 user-defined waveform slots at 2048 points each. For someone calibrating the same amp across several days, storing a setting is worth more than another 15 MHz of bandwidth.

Buyers treat it as a general-purpose bench DDS unit for audio, amplifier and filter work. The FPGA-based architecture with an active crystal oscillator reference keeps the output steady, and the linear sweep runs up to 999.9 seconds with a logarithmic option for frequency response checks.

The built-in frequency, period and pulse width measurement functions mean you can sanity check a signal without reaching for the scope first. It weighs just over 2 pounds, so moving it between the bench and the shelf is not a problem.

Who this suits

Pick this if you want a dependable dual-channel unit for amplifier alignment, filter sweeps and general electronics projects, and you would rather buy something with a long owner record than the biggest spec sheet. For most hobby benches this is the unit we would buy first.

Who should skip it

Skip it if you work above about 10 MHz, because 15 MHz is the lowest sine ceiling among the dual-channel models here. Some listings also ship without a printed manual, and the panel gives you little on-screen guidance while you set parameters.

3. OWON DGE2070 – 70 MHz Dual Channel in a Slim Portable Case

The DGE2070 is the odd one out in this lineup on bandwidth. Seventy megahertz across two channels at 300 MSa/s is more raw capability than units costing several times as much, and OWON has squeezed it into a case 2.9 by 7.87 by 2.7 inches.

That thinness is the reason it earns a place. If you take measurements away from a fixed bench, or your bench space is measured in inches rather than feet, a 1.85 pound unit with a 3.6 inch LCD changes what you can carry in one trip. The display shows the waveform shape while you adjust, which is more helpful than a numeric readout alone.

This model has no customer photos on file, so judge it on the specification sheet. Five standard waveforms plus 150 built-in arbitrary waves cover most of what a hobbyist needs without scrolling through menus. AM, FM, PM and FSK modulation sit alongside sweep and burst functions, so you can automate a filter response measurement without a separate signal source.

At 4.6 stars from 25 ratings with no one-star reviews, the feedback is uniformly positive on output quality and layout. The sample is small, so treat it as a well-documented instrument rather than a proven one, and download the manual from OWON before the box arrives.

Who this suits

This one fits hobbyists who need genuine bandwidth, either for digital work or because they want headroom above the audio band without a large instrument. It also suits anyone whose bench cannot swallow a full-depth benchtop box.

Who should skip it

Skip it if you need USB or LAN remote control, because PC software control here is limited compared with the Siglent and Rigol units. Some users also found accuracy below a comparable UNI-T model, and the menu structure needs a few sessions before it stops slowing you down.

4. Siglent SDG810 – Single Channel With Full Modulation for Radio Work

The SDG810 is the pick for vintage radio and audio restoration, and the reason is modulation rather than bandwidth. It covers AM, DSB-AM, FM, PM, FSK, ASK and PWM, and owners aligning AM and FM receivers consistently name the AM capability as the deciding feature.

At 125 MSa/s with 14-bit resolution and Easy Pulse for low-jitter edges, the output is accurate enough to inject a known signal into a receiver and work down the alignment chain. Reported frequency accuracy is high enough that owners treat it as a reference in their own right.

Store and recall is more useful than it sounds on a repair bench. When you come back to a half-finished alignment after a week, pulling up the exact injected frequency and level saves real time, and 46 built-in arbitrary waveforms including DC cover most bench stimulus needs.

Two negative reports stand out among 29 ratings: units that stopped responding after a short period, and slow support response from the manufacturer. Some reviewers also mention a blank display that a Utility menu setting resolves, so check that setting if it happens to you.

Who this suits

This suits anyone restoring AM or FM receivers, aligning audio gear, or testing transducers where one clean output channel is all you need. For those jobs the modulation suite is the deciding factor and the 10 MHz ceiling is irrelevant.

Who should skip it

Skip it if you want two independent outputs to compare a signal against a reference, or if you work anywhere near digital timing above 10 MHz. It is also single channel by design, so it cannot do the differential work many embedded developers need.

5. Rigol DG1022Z – 160 Built-In Waveforms and USB, Device and LAN

The DG1022Z is the pick for anyone who wants a large library of ready-made waveforms without building them by hand. One hundred and sixty built-in waveforms including sine, square, ramp, pulse, noise and harmonic shapes mean most stimulus you would want to try is a button press away.

Its interface set is the real differentiator. USB Host, USB Device and LAN together mean the generator can sit on a bench and be driven from a script, which is what makes it useful for repeated measurements where you want identical conditions across every run.

Who this suits

This fits hobbyists doing embedded work and repeated measurement runs who want remote control and a deep built-in waveform library. SiFi II synthesis keeps the output stable, and a built-in counter covers quick verification.

Who should skip it

Skip it if you care about the published 16-bit resolution figures you see elsewhere in this price class, because this is a 14-bit part at 200 MSa/s. The review record is also thin at 7 ratings, all of them positive, so long-term reliability is not proven by user evidence here.

6. Rigol DG822 Pro – Two Independent Channels at 16 Bits

The DG822 Pro is the strongest teaching pick in this lineup. Two fully independent channels let a student drive an amplifier on one output and a reference on the other, which is how you demonstrate phase shift and frequency response in a class instead of describing it.

Seven modulation types plus sweep, burst and harmonics cover almost every bench demonstration you would want to run. At 16-bit vertical resolution and 200 MSa/s, the output is smooth enough to show small-signal behaviour rather than the generator’s own noise floor.

Who this suits

This suits classroom labs, university teaching benches and hobbyists building anything that needs two signals at once. Rigol positions it for benchtop use and automated setups, so it drops into a shared lab workflow without argument.

Who should skip it

Skip it if you want a large user record to lean on, because 8 ratings is the second smallest sample here and there are no critical reviews at all. Note also that the product title lists 625 MSa/s while the specification list states 200 MSa/s, so confirm that figure with the seller before you rely on it.

7. UNI-T UTG962E – Palm-Sized 60 MHz That Runs From USB Power

The UTG962E answers the complaint that shows up again and again in hobbyist forums, which is that the affordable dual-channel boxes are all the same size as a small suitcase. This one is 7 by 3 by 4 inches and weighs 14.1 ounces, which is closer to a handheld meter than a bench instrument.

USB power is the detail worth knowing about. Running from a 5V supply lets you isolate the generator from house mains, which removes a ground loop from the measurement when you are working on audio gear that hums or on a circuit that picks up noise from the bench supply.

Who this suits

This suits hobbyists with a cramped bench, a shared space, or a habit of taking measurements to the object rather than bringing the object to the bench. Reviewers use it for amplifier response, filter troubleshooting, counter verification and vintage radio alignment, and near-silent operation matters in a listening environment.

Who should skip it

Skip it if you need deep arbitrary waveform memory, because 4 Kpts is thin against the 2048-point-per-slot units and the deep libraries on the Rigol. A perfect 5.0 average across 9 ratings is promising rather than proven, so treat it accordingly.

8. UNI-T UTG932E – 30 MHz Dual Channel With Channel Combining

The UTG932E is the pick for ham radio alignment, and channel combining is the feature that justifies it. Being able to combine Ch1 and Ch2 on one output is unusual at this level and useful when you need one combined signal instead of two separate ones.

The accessory package is unusually complete for this class. You get a power adapter, USB cable, power cord, BNC cable, a BNC cable with alligator clips, a paper manual and an eManual, which saves the usual hunt through online documentation before your first session.

On paper it is a strong feature list: six modulation types including Line and Log, 24 groups of non-volatile waveform storage, 200 MSa/s at 14 bits, 1 Hz full-band frequency resolution and a 6-digit counter with TTL level output. Owners working on turntable refurbishment and pro audio measurement report solid results once they have learned the menus.

The real-world reports are less flattering than the specification sheet. Two problems dominate: audible switching supply noise that can reach the output, and glitching on nearly every change of frequency, amplitude or phase. At 4.1 stars, this is the only unit here where one-star ratings come close to matching five-star ratings.

Who this suits

This suits hobbyists doing ham radio alignment or small-lab measurement who need the bundled leads and a channel combining option. If your listening environment is quiet and you work close to home mains, the supply noise is worth testing before you commit.

Who should skip it

Skip it if clean low-noise output matters more than the accessory bundle, or if you change settings frequently and cannot tolerate the output restarting. Compare it against the Koolertron, which covers similar ground with a much longer owner record and a better average rating.

9. Seesii JDS6600 – 60 MHz Dual Channel With a Bundled Frequency Meter

The JDS6600 is the budget pick, and it answers the most common argument in hobbyist forums about whether the cheap 60 MHz boxes are worth buying. Sixty megahertz across two channels at 200 MSa/s for this money is genuinely capable rather than a toy.

Feature coverage is broad: 99 groups of instrument state storage, 60 user-defined waveform slots, independent per-channel duty cycle adjustment, frequency and pulse width measurement, plus linear sweep to 999.9 seconds and a logarithmic sweep for response work. Bundled waveform software builds custom waves offline and the result runs standalone once loaded.

Buyer opinions split usefully. Hobby and student owners call it a great general-purpose instrument, and one long-term owner reports three years of steady service in vintage audio repair. The critical reviews concentrate on the noisy bundled power supply, the light chassis and the missing sweep trigger output.

That last point matters more than it looks. Without a sweep start trigger, your oscilloscope cannot be synchronised to the sweep, so capturing a clean frequency response trace takes a different technique. Plan for manual triggering if you rely on sweeps.

Who this suits

This suits students and hobbyists who want real dual-channel bandwidth without spending near the middle of this list. If you already have an external clean supply or work on short sessions, the noise complaint largely goes away.

Who should skip it

Skip it if amplitude accuracy under load matters, since output amplitude drops noticeably once the circuit you drive draws current. The lightweight chassis also slides on hard bench surfaces, and one owner reported a unit that burned in after extended daily power-on.

10. DOMINTY FY6900 – 60 MHz Dual Channel Built for Students

The FY6900 is the most straightforward unit here for a first bench, and it ranks in the Function Generators category at number 21, which tells you how many people have bought exactly this kind of box. Sixty megahertz, two channels and 250 MSa/s is a lot of capability for a first instrument.

Two design choices stand out for correctness. Output switching noise is attenuated at the driver stage rather than injected at the input, which keeps the output cleaner than some boxes in this class. The AC ground is also properly bonded to the BNC shells, so you avoid the floating-ground faults that cause confusing faults when probing a live circuit.

Who this suits

This suits students and first-time buyers who want a capable learning tool instead of a shared lab bench. Owners describe it as easy to pick up without reading documentation, and the built-in frequency meter plus linear and logarithmic sweep cover most coursework stimulus.

Who should skip it

Skip it if you will adjust parameters often, because the output restarts on nearly every knob or button change, which makes fine work frustrating. The screen is also very small and hard to read during selection, the case is flimsy, and there is no trigger output in sweep mode for synchronised scope work.

Which Function Generator for Which Hobby Project?

Matching a generator to a project is more useful than matching it to a spec sheet. These are the jobs we see most often on hobbyist benches, and the picks map cleanly onto them.

Amplifier and filter characterisation. You need a sweep across the band of interest and enough amplitude headroom to drive the input. The Siglent SDG2042X suits this best because USB and LAN let you automate the sweep and log the response against your scope.

Vintage radio alignment. A stable low-frequency sine plus AM modulation is the working requirement. The Siglent SDG810 is built for exactly this, and the Koolertron covers the same ground if you want two channels.

Synth and pedal calibration. Biasing circuits usually means a known sine at a known amplitude into a high impedance input. For that, the Koolertron or the OWON DGE2070 both give you the frequency stability and stored setups to repeat the job.

Embedded and MCU testing. You need fast edges and accurate timing, which means low jitter. The Siglent SDG2042X with Easy Pulse or the SDG810 with its own Easy Pulse implementation are the two to look at here, and the Rigol DG822 Pro adds the second channel.

Field work and shared benches. The UNI-T UTG962E is small enough to carry and runs from USB power, which lets you isolate it from house mains when chasing noise.

Teaching and demonstration. Two independent channels let an instructor drive a device and a reference simultaneously. The Rigol DG822 Pro is built for lab demonstration, and the DOMINTY FY6900 covers the same ground for student benches.

For other bench tools that share this workspace, our guides to resin curing stations and airbrush spray booths cover the curing and finishing side of a small workshop.

How to Choose a Function Generator

1. Bandwidth against your real work. Almost all hobby electronics work stays under about 15 MHz. Higher bandwidth only matters for radio work, digital timing above that, or giving yourself headroom. Do not pay for 60 or 70 MHz if you are aligning an audio amplifier.

2. Channels. Single channel is fine for one stimulus. Dual channel is the first thing you will wish you had, because it lets you compare an input against a reference, or drive two inputs of a circuit at once. Check whether the two channels can be combined as well as set independently.

3. Vertical resolution and sample rate. Resolution in bits sets the noise floor, so 16-bit parts give you cleaner small-signal work than 14-bit parts. Sample rate in MSa/s determines whether high frequencies are reproduced cleanly or aliased. Both figures only mean something together, so read the datasheet test conditions.

4. Arbitrary waveform depth. Points of memory decide how detailed a custom shape can be. A few thousand points covers most audio and control work; tens of thousands lets you import a captured waveform from a real circuit.

5. Modulation, sweep and burst. AM, FM, PM and FSK cover radio and modulation work. Sweep gives you frequency response testing, and burst gives you repeatable pulsed stimuli. Check for a sweep trigger output, because without it your scope cannot synchronise to the sweep.

6. Connectivity. USB and LAN let you script the generator and pair it with a scope on one computer, which is the single biggest upgrade for repeated measurement work. USB Host ports also let you save setups to a stick.

7. Output amplitude reach. This is the trap most people fall into. The headline amplitude may only be available into a high impedance load, and many cheap units cannot deliver their full output into a real circuit. Check what the output gives you into 50 ohm before committing to a project that needs a specific voltage.

8. Reliability and the owner record. Review counts matter more than spec sheets. A unit with hundreds of ratings averaging above 4 has a track record, while a perfect score on nine ratings tells you very little. If you can, add the new bench instrument to our benchtop tool guide shortlist too.

Jargon Glossary: DDS, Arb, Vpp, Jitter and the 50 Ohm Load

DDS means direct digital synthesis. A clock drives a phase accumulator that indexes a waveform lookup table, and a converter turns the result into an analog signal. Almost every modern generator uses it, and it is why cheap units are now competent.

Arb is short for arbitrary waveform: a shape you define yourself and upload, rather than one of the built-in sine, square, triangle, pulse, sawtooth, noise or staircase options.

Vpp means volts peak to peak, the total height of a waveform from its lowest point to its highest. If a circuit needs 6 Vpp, check the generator can actually produce that into your load.

Jitter is the tiny timing wobble between the intended edge and the real one. Low jitter matters for pulse timing work and hardly at all for audio.

Rise time is how quickly an edge goes from low to high. Faster edges let you test bandwidth and ringing, and matter for digital work.

50 ohm load is the impedance most RF and video outputs expect. A generator with a 50 ohm source will deliver half its open-circuit voltage into a 50 ohm load, which is the usual reason a signal arrives at half the amplitude you expected.

Frequency resolution is the smallest step you can dial in. 1 Hz full-band resolution on the UNI-T UTG932E is unusually fine for this class, while 1 microHz on the UTG962E suits low-frequency work.

Sweep and burst. Sweep moves the frequency across a range, typically for response testing. Burst repeats a set number of cycles at a fixed frequency.

Frequently Asked Questions

Final Verdict

The Siglent SDG2042X takes the top spot among these best function generators for hobbyists because 16-bit resolution, two independent channels and USB plus LAN control are the three things you will keep using years after the novelty of a new waveform wears off. For most hobby benches the Koolertron 15 MHz DDS is the smarter first buy, with the longest owner record here and dual-channel output that covers amplifier, filter and audio work.

Work out your job before you buy. Radio and audio alignment want the Siglent SDG810, cramped spaces want the UNI-T UTG962E, teaching wants two independent channels from the Rigol DG822 Pro, and tight budgets get a genuinely capable 60 MHz box in the Seesii JDS6600. Check whether your oscilloscope already has a generator output first, then pick the one that matches the project in front of you.