Handbook for Sound Engineers

772 Chapter 22 (22-20) where, R 1 is the series resistor in ohms connected on the side of the larger impedance; R 2 is the shunt ...

Attenuators 773 (22-24) where, R 1 is the terminating resistor in ohms, N is the number of branch circuits, Z is the circuit imp ...

774 Chapter 22 require no calculation. This network is designed to work between impedances of equal value only. The contact arms ...

Attenuators 775 When the impedances are unequal values, the resis- tors are calculated with the following equations: (22-36) (22 ...

776 Chapter 22 (22-42) where, , The value of K is taken from Table 22-1. Any U pad may be balanced to ground by connecting a gro ...

Attenuators 777 and one end connected to the load, Fig. 22-20. The volume control should be a high impedance with respect to the ...

778 Chapter 22 (22-49) Normally, volume controls have a logarithmic taper, so the first 50% of the pot only represents a change ...

Attenuators 779 has 100% feedback. Increasing the value of R 2 decreases feedback, consequently increasing gain by the ratio of ...

780 Chapter 22 22.2.15 Mixers A mixer is a device used to mix two or more signals into one composite signal. Mixers may be adjus ...

Attenuators 781 amplifier is –91 dB and out of the booster amplifier is –58 dB [–110 + (+33) + (–14) + (+33)]. The mixer noise g ...

782 Chapter 22 the source impedances at the inputs. To illustrate the method of calculating interchannel isolation, refer to Fig ...

783 Chapter 23 Filters and Equalizers by Steven McManus 23.1 Filter and Equalizer Definitions................................... ...

784 23.3.1 Filter Topologies..................................................................... 794 23.3.1.1 Sallen-Key....... ...

Filters and Equalizers 785 23.1 Filter and Equalizer Definitions A filter is a device or network for separating signals on the b ...

786 Chapter 23 23.1.8 Order The order of a filter is determined by the number of reactive elements in the circuit. These can eit ...

Filters and Equalizers 787 The impedance may be represented as a single complex number where the real part is the resistance and ...

788 Chapter 23 23.2.1.2 Inductive Networks The inductor has impedance that approaches an open circuit at high frequency and a sh ...

Filters and Equalizers 789 impedance of the inductor Eq. 23-12 and the capacitor Eq. 23-7 vary with frequency and are chosen suc ...

790 Chapter 23 (23-25) (23-26) where, fc is the cutoff frequency, Z 0 is the line impedance. 23.2.3.3 Parallel Resonant Elements ...

Filters and Equalizers 791 23.2.3.5 Bandpass The impedance characteristics of the series and parallel resonant elements can be u ...