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Delay2008· MXR / Jim Dunlop (USA)

MXR Carbon Copy Analog Delay

All-analog bucket-brigade delay — dark, warm repeats up to 600 ms.

⏳
Schematic pending verification

We don't ship reference schematics until they've been hand-authored against authoritative sources (manufacturer service docs, ElectroSmash analyses, GEOFEX writeups) and reviewed in the simulator. Until then, the BOM, signal chain, controls and mod notes below are accurate, and you can still add this pedal to a project — it just won't include a circuit yet.

About

Built around two MN3205 BBD (bucket-brigade device) chips clocked by an MN3102. Repeats roll off the high end progressively, producing the warm, slightly-degrading echoes that defined analog delay before DSP. A modulation switch adds subtle chorus-like wobble to long repeats.

Signal chain preview

6 stages
Input
Input buffer + pre-emphasis filter
Compander encoder (compress before BBD)
MN3205 BBD pair clocked by MN3102
Compander decoder (expand after BBD) + de-emphasis filter
Feedback (Regen) and wet/dry mix op-amp
Optional LFO modulates BBD clock
Output

Quick facts

  • All-analog signal path — no A/D conversion, no clock noise leakage.
  • Two cascaded MN3205 BBDs (4096 stages each) give up to ~600 ms of delay.
  • Modulation toggle adds LFO-driven clock variation for tape-style wow & flutter.

Controls

  • Regen (100k log)
  • Mix (10k linear)
  • Delay (50k linear)
  • Mod (SPST)