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One dimensional Dirac operators $$ L_{bc}(v) y = i 1 & 0 0 & -1 \frac{dy}{dx}+ v(x) y, \quad y = y_1 y_2, \quad x\in[0,\pi]$$, considered with$L^2$-potentials $ v(x) = 0 & P(x) Q(x) & 0$ and subject to regular boundaryconditions ($bc$), have discrete spectrum. For strictly regular $bc,$ thespectrum of the free operator $ L_{bc}(0) $ is simple while the spectrum of $L_{bc}(v) $ is eventually simple, and the corresponding normalized rootfunction systems are Riesz bases. For expansions of functions of boundedvariation about these Riesz bases, we prove the uniform equiconvergenceproperty and point-wise convergence on the closed interval $[0,\pi].$ Analogousresults are obtained for regular but not strictly regular $bc.$

Equiconvergence of spectral decompositions of 1D Dirac operators with regular boundary conditions