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Despite being analog in their representation of individual signal voltage samples, these devices are discrete in the time domain and thus are limited by the Nyquist–Shannon sampling theorem; both the input and output signals are generally low-pass filtered. The input must be low-pass filtered to avoid aliasing effects, while the output is low-pass filtered for reconstruction. (A low-pass is used as an approximation to the Whittaker–Shannon interpolation formula.)
==Euro==
{| border="1" cellpadding="8"
! Manufacturer !! Module !! Width !! Power !! Comment !! Product Page
|-
|[[Doepfer]]
||[[A188-1]]
||14hp
||80mA
||[[BBD]],128, 256, 512, 1024, 2048 or 4096 stages
||[http://www.doepfer.de/A1881.htm A-188-1]
|-
|[[Doepfer]]
||[[A188-2]]
||30hp
||120mA
||[[BBD]] tapped delay Module
||[http://www.doepfer.de/A1882.htm A-188-2]
|-
|[[The Harvestman]]
||[[Tyme Sefari]]
||15HP
||~80mA
||Digital 8 bit delay/[[sampler]]
||[http://www.theharvestman.org/1973.htm Tyme Sefari]
|}
==5U==
{| border="1" cellpadding="8"
!Manufacturer !! Module !! Width !! Power !! Comment !! Product Page
|-
|[[Modcan]]
||[[Digital Delay 59B]]
||2U
||
||
||[http://www.modcan.com/bseries/ddelay.html 59B Digital Delay]
|-
|[[Synthetic Sound Labs]]
||[[Voltage Controlled Digital Delay 1310]]
||1U
||+15V @ 35ma, -15V @ 8ma
||
||[http://www.steamsynth.com/m_DigitalDelay.aspx Digital Delay 1310]
|-
|[[Club Of The Knobs]]
||[[C1680 Voltage Controlled Analog Delay]]
||
||
||
||[http://www.cluboftheknobs.com/modules.html C1680]
|-
|
||
||
||
||
||
|}
==Frac==
{| border="1" cellpadding="8"
! Manufacturer !! Module !! Width !! Power !! Comment !! Product Page
|-
|[[Blacet Research]]
||[[Time Machine]]
||
||
||
||[http://www.blacet.com/cool.html Time Machine]
|}
==References==
|