Analog vs digital delay
The repeats sound different for a reason that is mechanical rather than mystical, and the ceiling on delay time is published.
Fret & Fuzz earns a commission when you buy through the links on this page. It costs you nothing and it does not decide what we rank. How we’re funded.
We have not played this gear. Every pick below is chosen from published manufacturer specifications and the arithmetic set out in how we research, which you can re-run yourself.
Analog delay passes your signal through a chain of capacitor stages, losing a little high-frequency content at every transfer — so the repeats darken progressively, and the maximum delay time is short (600 ms on an MXR Carbon Copy). Digital delay converts the signal to numbers, so time is effectively unlimited and the repeats stay clean unless a mode deliberately degrades them.
That is the whole mechanical difference, and every practical consequence follows from it.
01Why analog repeats darken
A bucket-brigade device is a long chain of capacitors that hands the signal from one to the next, one clock cycle at a time. Every hand-off loses a little accuracy and a little high-frequency content. To produce multiple repeats, the output is fed back to the input, so each additional repeat has been through the whole chain again.
The practical value is that a darkened repeat sits further behind the dry note. In a busy arrangement, a clean digital repeat competes with what you are playing now; a darkened one does not. That is a real musical difference and it is a consequence of the mechanism, not of any inherent superiority.
Which delay you actually need
| # | Product | Best for | Price |
|---|---|---|---|
| 01 | No photo MXR Carbon Copy Analog Delay 600 ms of bucket-brigade delay whose repeats darken progressively as they decay. | Repeats that sit behind the guitar | |
| 02 | No photo BOSS DD-8 Digital Delay Eleven modes and up to 10 seconds, including an analog-emulating mode. | One delay for every job | |
| 03 | No photo Donner Yellow Fall Analog Delay A genuine analog circuit in a mini enclosure, with a short ceiling to match. | Analog character at the lowest price |
Rows link to the full write-up further down this page. Prices come from the live price layer only — where there is no live figure the button reads “Check price” rather than showing a remembered number.
03The comparison
| Analog | Digital | |
|---|---|---|
| Maximum delay time | Typically under 600 ms | Seconds — the DD-8 publishes 10 |
| Repeat character | Darkens progressively | Clean unless a mode degrades them |
| Tap tempo | Rare | Standard |
| Modes | One | Eleven on the DD-8 |
| Stereo | Rare | Common |
| Presets | None | Available on several |
| Current draw | Low | 100 mA on the DD-8 |
| Best at | Slapback and short rhythmic repeats | Ambient washes and tempo-synced parts |
MXR Carbon Copy Analog Delay
Repeats that sit behind the guitar
The number600 ms maximum. Dunlop publishes no current-draw figure.
Each repeat passes back through a long chain of capacitor stages and loses a little top end on every trip. That progressive darkening is not a tolerated flaw — it is the reason to buy an analog delay, because a darkened repeat stays out of the way of the note you are playing now.
600 ms is the published ceiling and there is no tap tempo. This is a slapback and short-repeat pedal.
True bypass, an all-analog signal path, and two internal trim pots setting modulation width and rate.
| Maximum delay | 600 ms |
|---|---|
| Controls | Delay, Mix, Regen, plus a modulation footswitch |
| Modulation | Two internal trim pots set modulation width and rate |
| Signal path | All-analog bucket-brigade delay |
| Bypass | True bypass |
| Power | 9 V battery, Dunlop ECB003 adapter, or a DC Brick / Iso-Brick supply |
| Current draw | Not published by Dunlop |
| What it does not do | 600 ms is the ceiling — there is no tap tempo, no presets, and no way to get a long ambient wash out of it. Repeats darken by design and cannot be made bright. |
Specs from MXR Carbon Copy product page. We have not used this unit.
BOSS DD-8 Digital Delay
One delay for every job
The number100 mA — roughly thirty times what an analog fuzz draws.
Memory is cheap, so delay time is effectively unlimited and multiple algorithms can share one pedal. BOSS publishes eleven modes covering analog-style, tape, reverse, shimmer and a looper.
Tap tempo, a Carryover switch so repeats ring out past bypass, and true stereo in and out with three output configurations.
The cost is 100 mA, which on a previously all-analog board is very often the moment a daisy chain starts to hum.
| Modes | 11 — Analog, Standard, Tape, Warm, Reverse, +RV, Shimmer, Mod, Warp, GLT, plus Loop |
|---|---|
| Maximum delay | Up to 10 seconds, with tap tempo |
| Controls | Mode, Time, Feedback, E.Level, Carryover switch, pedal switch |
| Current draw | 100 mA |
| Battery life | Approx. 3.5 hours on alkaline |
| I/O | True stereo in and out, with three selectable output modes |
| Weight | 440 g including battery |
| What it does not do | No adaptor included. At 100 mA it is not a pedal you daisy-chain casually, and the 3.5-hour battery figure means battery power is a backup, not a plan. |
Specs from BOSS DD-8 specifications. We have not used this unit.
Donner Yellow Fall Analog Delay
Analog character at the lowest price
Analog delay circuits are cheap to build, and this is a real one rather than a digital emulation — three knobs and repeats that darken.
The maximum delay time is short even by analog standards, which puts it firmly in slapback territory.
No power supply, no battery compartment, and no published electrical data, so you cannot plan a shared power output around it without measuring.
| Controls | Echo, Feedback, Time |
|---|---|
| Circuit | Analog delay in a mini enclosure |
| Power | 9 V DC center-negative — no battery compartment |
| Electrical data | No current-draw or impedance figure is published for this pedal, so none is stated here. |
| What it does not do | No power supply included, no tap tempo, no modulation. Maximum delay time is short — this is a slapback and short-repeat pedal, not an ambient one. |
Specs from Donner guitar effects range. We have not used this unit.
04Digital pedals that emulate analog
The BOSS DD-8 has an Analog mode that models bucket-brigade degradation. That is worth being precise about: it is a model of the behavior rather than the behavior itself. Whether the difference is audible is a listening judgment, and it is not one we have made — how we research is explicit about where that line sits.
What we can say is that the emulation gives you the darkening AND the long delay times and tap tempo, which no analog circuit does. If flexibility matters more to you than mechanism, that settles it.
05Which to buy
- You want slapback and short repeats, and nothing else. Analog. It does that job beautifully and costs almost nothing to power.
- You want ambient washes or repeats locked to tempo. Digital, and budget 100 mA for it.
- You want one delay and are not sure yet. Digital. An analog mode covers the first case; nothing covers the second on an analog pedal.
- Your board is on a daisy chain and quiet. Be aware that adding a digital delay is the classic trigger for hum — see isolated vs daisy chain.
Frequently asked questions
+ Is analog delay better than digital?
+ How long can an analog delay be?
+ Can a digital delay sound analog?
+ Why does adding a delay make my board hum?
Sources
Related on Fret & Fuzz
Best delay pedals
Maximum delay time and current draw settle most of this category. Four delays on their published figures.
Best Delay pick: BOSS DD-8 Digital Delay
Delay time and tempo: the arithmetic
60,000 divided by the tempo. The full table for quarter, eighth, dotted-eighth and sixteenth notes.
Top pick: BOSS DD-8 Digital Delay
Analog vs digital pedals
The label predicts your power budget reliably and your tone unreliably. Published draws across two orders of magnitude.
Top pick: MXR Carbon Copy Analog Delay
Isolated power supply vs daisy chain
Two topologies, two failure modes. The mechanism behind the hum, and the point at which a daisy chain stops being enough.
Top pick: Truetone 1 SPOT
