  We present a simple electronic circuit which produces negative group delays
for base-band pulses. When a band-limited pulse is applied as the input, a
forwarded pulse appears at the output. The negative group delays in lumped
systems share the same mechanism with the superluminal light propagation, which
is recently demonstrated in an absorption-free, anomalous dispersive medium
[Wang et al., Nature 406, 277 (2000)]. In this circuit, the advance time more
than twenty percent of the pulse width can easily be achieved. The time
constants, which can be in the order of seconds, is slow enough to be observed
with the naked eye by looking at the lamps driven by the pulses.
