  We explicitly construct a family of ${\cal N}=4$ superconformal mechanics of
dyonic particles, generalizing the work of Anninos et
al.\,\cite{Anninos:2013nra} to an arbitrary number of particles. These
mechanics are obtained from a scaling limit of the effective Coulomb branch
description of ${\mathcal N}=4$ quiver quantum mechanics describing D-branes in
type II Calabi-Yau compactifications. In the supergravity description of these
D-branes this limit changes the asymptotics to AdS$_2\times $S$^2\times$CY$_3$.
We exhibit the $D(1,2;0)$ superconformal symmetry and conserved charges of the
mechanics in detail. In addition we present an alternative formulation as a
sigma model on a hyperk\"ahler manifold with torsion.
