  We suggest an operating scheme for the deliberate generation of
spin-entangled electron pairs in a normal-metal mesoscopic structure with fork
geometry. Voltage pulses with associated Faraday flux equal to one flux unit
$\Phi_0=hc/e$ drive individual singlet-pairs of electrons towards the beam
splitter. The spin-entangled pair is created through a post-selection in the
two branches of the fork. We analyze the appearance of entanglement in a Bell
inequality test formulated in terms of the number of transmitted electrons with
a given spin polarization.
