Dimmer für Taschenlampe

The basic principle of a current dumping amplifier has been de-scribed previously in Elektor (see Elektors 8 and 21). To recap briefly, the circuit exploits the fact that, due to the effect of the four passive com-ponents, R2, R3, L and C shown in figure 1, the non-linear characteristic of the output stage becomes unim-portant. Thus it is possible to use a Class-B output stage (i.e. the output transistors are biased to their cut-off points so that there is no quiescent output current) with all the advan-tages and none of the disadvantages (crossover distortion) of that con-figuration.