A recently proposed method [K. Pyragas, Phys. Lett. A 181 (1993) 203]
of synchronizing outputs of two chaotic systems by small time continuo
us feedback perturbations is realized experimentally in a circuit impl
ementation. The effect of the difference in the parameters between the
two systems on synchronization has been investigated. The experimenta
l results are interpreted in terms of calculated conditional Liapunov
exponents.