Название: The Audio Circuits Cookbook: Building Blocks and Tools to Design Professional Audio Devices
Автор: Ethan Winer
Издательство: Routledge
Год: 2025
Страниц: 288
Язык: английский
Формат: epub (true)
Размер: 26.7 MB

The Audio Circuits Cookbook is a comprehensive collection of high-quality audio circuit modules―“building blocks” ―that readers can arrange to create complete audio devices. More than 80 featured circuits cover every aspect of audio, from basics such as active rectifiers, peak followers, and oscillators, to complete professional quality devices including compressors, equalizers, preamps, and an analog synthesizer.

Offering a range of tutorial advice that covers capacitor selection, multi-layer PC board design, and more, each circuit in this book is also provided as an LTspice file, ready to be copied into your projects. It includes detailed explanations of every type of active filter commonly used for audio, along with a spreadsheet that calculates their component values, as well as Ohm’s Law and Decibels spreadsheets.

The LTspice circuit simulation program is used to demonstrate the various examples and modules in this book. Before getting to specifics about semiconductors, it’s worth mentioning that LTspice offers many types of diodes, transistors, and op-amps. For simplicity I generally use only one type for all my circuits. The first time I add a small signal diode I immediately change it to a 1N4148. Then I can copy that diode around when I need more. This diode works well, and is very popular and inexpensive. For transistors I change the default NPN to a 2N3904 and the PNP to a 2N3906, again copying as needed rather than going through the steps to select and replace repeatedly. For op-amps, most audio circuits will use the LTspice Universal Op-Amp 2. This is described more fully in Chapter 3, which explains more about the op-amps you’ll actually buy and use when you build these circuits for real.

Note that semiconductors are temperature sensitive. The forward voltage drop of diode and transistor junctions varies with ambient temperature. In fact, a semiconductor junction can be used as the sensor in an electronic thermometer. A transistor’s inherent gain also varies, dropping at lower temperatures. In some circuits dual transistors built onto a single substrate can be used for temperature compensation, or to ensure equal gain when that’s needed. Dual transistors are used in the log converters in Chapter 4, and also for the bottom transistor pair in the Moog VCF ladder filter in Chapter 7. When needed, a temperature compensating resistor called a thermistor can be added to counter the temperature shift of a semiconductor’s junction voltage.

Providing practical explanations of both simple and sophisticated audio circuits using minimal math and theory, this is an ideal manual for intermediate audio professionals, hobbyists, and students coming to audio electronics from non-engineering backgrounds. Professional engineers will find much of value as well in the complete and tested circuits.






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