By Bob Cordell
Master the paintings of audio strength amplifier design
This finished ebook on audio strength amplifier layout will attract participants of the pro audio engineering group in addition to the hobbyist. Designing Audio strength Amplifiers starts off with energy amplifier layout fundamentals amateur can comprehend and strikes throughout to in-depth layout suggestions for the very refined audiophile audio strength amplifier fashion designer. this is often the one top resource of information for somebody who desires to layout an audio strength amplifier, even if for enjoyable or revenue. enhance and hone your audio layout abilities with in-depth insurance of those and different themes:
* fundamentals of audio energy amplifier layout
* MOSFET strength amplifiers and mistake correction
* Static and dynamic crossover distortion demystified
* knowing destructive suggestions and the debate surrounding it
* complicated damaging suggestions reimbursement ideas
* refined DC servo layout
* Audio measurements and instrumentation
* missed assets of distortion
* SPICE simulation for audio amplifiers, together with an educational
* SPICE transistor modeling, together with the EKV version for strength MOSFETs
* Thermal layout and using ThermalTrak transistors
* 4 chapters dedicated to type D amplifiers
Supplemental fabric to be had at www.cordellaudio.com includes:
* Ready-to-run amplifier simulations
* Key transistor versions
* different bonus materials
Uploader's note: seems to be a retail copy.
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Extra info for Designing Audio Power Amplifiers
A 2N5551 VAS transistor biased at 10 mA and having no emitter degeneration will have an output resistance on the order of 14 kΩ at a collector-emitter voltage of 35 V. This would correspond to a signal output voltage of 0 V in an arrangement with ± 35 V power supplies. The same transistor with 10:1 emitter degeneration will have an output resistance of about 135 kΩ. At a collector-emitter voltage of only 5 V (corresponding to a -30-V output swing) that transistor will have a reduced output resistance of 105 kΩ.
Power amplifier design is introduced by describing a very basic design. That design is analyzed and then followed through many stages of improvements. The explanation 3 4 Audio Power Amplifier Basics of the reasons for and results of the improvements illustrates how to think about amplifier design and understand many of the trade-offs. Actual simulated distortion results are presented at each stage of the evolution of the design. Once you are made comfortable with amplifier design and analysis, Part 2 delivers the meat of high-performance design and a much deeper understanding of performance-limiting factors and sources of distortion.
Current Gain If a small current is sourced into the base of an NPN transistor, a much larger current flows in the collector. The ratio of these two currents is the current gain, commonly called beta (β) or hfe. Similarly, if one sinks a small current from the base of a PNP transistor, a much larger current flows in its collector. The current gain for a typical small-signal transistor often lies between 50 and 200. For an output transistor, β typically lies between 20 and 100. Beta can vary quite a bit from transistor to transistor and is also a mild function of the transistor current and collector voltage.