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Here’s an interesting problem: how do you create a delayed duplicate of a sound without recording it to some sort of storage medium? Back in the days before digital signal processing and cheap, abundant memory, this was a prime engineering issue. Until two Engineers named Sangster and Teer came up with a deceptively simple solution: the bucket brigade delay.

In this video, I attempt to reverse engineer the architecture of a classic BBD, recreate a bare bones version on the breadboard – and then use a proper BBD chip to design a simple DIY audio delay. If you want to build along, here's the bill of materials:

BILL OF MATERIALS

RESISTORS
2M2 x1
100k x8
82k x1
56k x1
51k x1
47k x1
39k x1
22k x3
10k x2
6k2 x1
4k7 x1

CAPACITORS

1 uF x2
10 nF x1
1 nF x1 (more if you want to build the discrete component BBD!)
220 pF x2

TRANSISTORS & DIODES

1N4148 (small signal diode) x5
J113 (NCH JFET) x1 (more if you want to build the discrete component BBD!)

POTENTIOMETERS

100k (A104) x1
100k (B104) x3
10k (B103) x1

CHIPS

TL072 (dual op amp) x3
V3205SD/MN3205 (BBD 4096) x1
4046BE (PLL) x1

SWITCHES

SPDT (Single pole, double throw) x1

Chapters
00:00 BBD Overview
01:43 Analog Sampling
10:09 Sample Transfer
16:28 Buffering & Listening
19:50 Dual Tap Reconstruction
23:01 More Stages with the V3205
27:55 Reconstruction Sampling
33:26 Dry/Wet Mixing
34:41 Feedback
36:04 Flanger Mode
41:43 Inhibit CV
42:59 Sound Demo & Outro