loudspeaker peak indicator

7-08 — elektor july/august 1981 loudspeaker peak indicator Nowadays, any decent loudspeaker unit is, fortu- nately, pretty resistant to rough treatment. However, problems can arise in the living room when the volume is turned up high enough for clipping to occur. At that point substantial distortion and higher harmonics can be generated. This does not figure 1. Its power supply is derived trom capacitor C1 which is charged via R1 and D1 from the speaker output of the amplifier. Half-wave rectification was considered suitable since "normal" 45 V transistors can be used. With no signal input all transistors are switched off and therefore current drain from C2 is virtually nil. When the input signal level exceeds a certain value (dependent on the setting of P1), the voltage at the junction of R2 and R3 will reach a point at which T1 will start to conduct. This switches on T2 Al Resistor R7 has been causing C1 to charge rap included to prevent the maximum permitte collector current ...