It is interesting to listen to your favorite music on a stereo system. It may be probably more interesting if you can watch the dancing lights along with the music. An effort has been made to try this idea with the help of a small circuit. The circuit is working satisfactorily for the last few months.
The circuit is described for one channel of the stereo amplifier. The other channel will of course be identical to it. A parallel point from loudspeaker of one channel is connected to the input of the three transistors! Fig. I). With 4.7k preset, the bias of T1, T2 and T3 is adjusted such that: (a) at low level of music only Tl conducts, (b) at medium level of music Tl and T2 conduct, Cc) at high level of music Tl, T2 and T3 conduct.
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