A company of convicts marching to and from their cells bearing their slop-buckets.

- american underworld dictionary - 1950
In the world of electronics, this refers to an analog semiconductor chip that consists primarily of a capacitor "ladder" which passes an analog signal from stage to stage in synchronization with an external clock signal. Bucket brigade chips are used primarily to create analog delay lines which can be used in audio applications such as guitar effects like flanging, delay and chorus.

Unfortunately, the last of these chips (the MNXXXX series from Panasonic) went out of production in 1999, which means no more analog delay effects can be manufactured. Previous incarnations are currently in very short supply and are highly prized, hence expensive.

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