Handbook for Sound Engineers

372 Chapter 13 device and have good thermal conductivity across its entire area. The specific thermal resistance U of inter- fac ...

Heatsinks and Relays 373 For a triac, VD is about 1.5 V; for SCRs, about 0.7 V. For transistors it could be from 0.7 V to more t ...

374 Chapter 13 may be used to switch a number of other circuits at the same time or in sequence from one input. Relays may be el ...

Heatsinks and Relays 375 Crosstalk (Crosstalk Coupling). When applied to multichannel relays, the ratio, expressed in dB, of the ...

376 Chapter 13 (13-11) where, Vt is the transmitted voltage, Vi is the incident voltage. Latching Relay. A bistable relay, typic ...

Heatsinks and Relays 377 Shield, Magnetic. An optional plate or shell constructed of magnetically permeable material such as nic ...

378 Chapter 13 (13-15) When using a rectifier, the rectifier is an open circuit to the power source because it is reverse biased ...

Heatsinks and Relays 379 tromechanical relay contacts and destroy solid-state relays. 13.2.3.1 The Effects of Various Loads Inca ...

380 Chapter 13 mechanical arrangement of the contacts may be such that when the relay is at rest, certain circuits are either op ...

Heatsinks and Relays 381 current in the actuating coil. As a result, there is always enough pull on the armature to hold it in t ...

382 Chapter 13 ating in close proximity. The potential for magnetic coupling must be taken into account when installing densely ...

Heatsinks and Relays 383 meet. The capsule, surrounded by an electromagnetic coil, is made of glass and filled with a dry inert ...

384 Chapter 13 13.2.5.5 Mercury-Wetted Contact Relays Mercury-wetted contact relays are a form of reed relays consisting of a gl ...

Heatsinks and Relays 385 Insertion and Other Losses. In the past, the typical parameters used to quantify RF performance of reed ...

386 Chapter 13 a simple first-order low-pass filter. The rise time is approximately (13-17) Substituting into the equation for t ...

Heatsinks and Relays 387 higher, plus, the breakdown voltage at these pF•ȍ levels is much lower than that of a reed switch. The ...

388 Chapter 13 Fig. 13-20 shows three methods of operating a reed switch using a coil. Fig. 13-21 shows four ways to operate a r ...

Heatsinks and Relays 389 Short-circuit and high-surge current protection is performed with fast blow fuses or series resistors. ...

390 Chapter 13 (13-24) 13.2.6.4 Low Load Current Protection If the load current is low, it may be necessary to take special prec ...

Heatsinks and Relays 391 many solid-state systems to achieve very high power gain—1000 to 10,000 or more. Now marketed in single ...