Softswitching - improvement to the High Com

Soft switching elektor december 1982 — 12-41 Soft improvement to the High Com based on information from the Telefunken Television and Radio Company, Audio Development In case the title of this article could be misinterpreted, the purpose of this circuit is not to replace the noisy toggle switches that are typically used in home-made equipment. tortion in the audible range. To quote actual figures: the distortion content of the first harmonic of a sinusoidal 20 Hz signal is reduced by about 6% and that of the second harmonic by 3.5%. The total distortion factor with the new version is only 3.31%, compared to 10.38% with the old version. The im- provement was achieved by increasing the decay time which is effective during the holding time. 2. Interference caused by very short pulses, such as electrostatic discharges when playing records, is now eliminated by modifying the response time of the circuit. The network for this function now contains two time constants in- stead of one. ...