Harman Kardon HK 990 Stereo Integrated Amplifier with Digital Room Correction and Dual Subwoofer Bass Management – Part III
- Written by Dr. David A. Rich
- Published on 03 November 2011
- Harman Kardon HK 990 Stereo Integrated Amplifier with Digital Room Correction and Dual Subwoofer Bass Management – Part III
- Page 2: Construction of the Analog Blocks
- Page 3: Volume Control
- Page 4: Power Amplifier
- Page 5: Phono Stage
- Page 6: Headphone Stage
- Page 7: Analog Circuitry Connected to the DACs
- Page 8: Conclusions About the HK 990 Circuit Design
- Page 9: Tape Recorder Outputs and Tape Monitor Details
- Page 10: Proper Connection
- Page 11: Conclusions About HK990 Tape Recorder Functionality
- Page 12: Overall Conclusions
- All Pages
Construction of the Analog Blocks
A textbook by Bob Cordell is an excellent reference. The book is oriented to those interested in audio-electronics design.
During the early 90's, I summarized basic fundamentals in several issues of The Audio Critic and analyzed fully-designed commercial components as case studies. Issues 18 and 20, focus on preamplifiers and power amplifiers, respectively.
Free PDFs of these articles are available at www.theaudiocritic.com.
For those with a limited knowledge of electronics, the classic The Art of Electronics (Horowitz and Hill) is a must-have. Though pricey and heavy (at 1100 pages), the breadth of material well serves the needs of both novices and experts. If you are lucky, it may be in your local library; otherwise, try to secure a copy through interlibrary loan.
Significantly cheaper is the 5th edition (2011) of Teach Yourself Electricity and Electronics written by Stan Gibilisco. I have not reviewed the text, but it has been recommended by others whose opinions I value.