Part 2 Contact info and web adresses of integrated circuits power audio amplifiers manufacturers

Crl- Cirrus Logic, Inc.
 P.O. Box 17847, Austin, Texas 78760, USA. Phone: (512) 445 7222
http://www.cirrus.com

Csm- Chengdu Sino Microelectronics System Co., Ltd.
2nd floor, Building D, Science & Technology Industrial Park, 11 Gaopeng Avenue, Chengdu
High-Tech Zone, Chengdu City, Sichuan Province, P.R.China. Phone: +86-28-8517-7737
http://www.csmsc.com451

Dae- Deawoo Semiconductor
60-8 Kasan-Dong, Kumchun-Gu, Seoul Korea. Phone: +02-818-9652
http://www.daewoo.co.kr

Ecg- ECG (Is not a current ICs manufacturer)
A Philips (USA) subdivision.
1025 Westminster Drive, Williamsport, PA 17701 USA
http://www.ecgproducts.com

Eut- Eutech Microelectronics
4F, 38-1, Ming Shen N. Rd. Sec. 1, Kuei-Shan, Taoyuan 333, Taiwan, R.O.C.
Phone: 886-3-3164556
http://www.eutechmicro.com

Exr- Exar Corporation
48720 Kato Road Freemont, CA 94538, USA. Phone: +1-510-668-7000
http://www.exar.com

Fch- Fairchild Semiconductor Corp.
333 Western Avenue, South Portland ME 04106, USA. Phone: 207/775-8100
http://www.fairchildsemi.com

Fuj- Fujitsu Microelectronics, Inc.
3545 North First Street, San Jose, CA 95134, USA. Phone: 408/922-9000
http://www.fujitsumicro.com

GE- General Electric Semiconductor
Electronics Park Bldg. 7 Syracuse, NY 13221, USA. Phone: 315/456-3606
http://www.ge.com

Gen- Gennum Corp.
Box 489, Station A, 970 Fraser Drive, Burlington, Ontario, Canada, L7R 3Y3
Phone:+1-905-632-2996
http://www.gennum.com

Har- Harris Corporation (Is not a current ICs manufacturer)
1025 West NASA Boulevard, Melbourne, Florida 32919-0001, USA
Phone: 1-321-727-9207
http://www.harris.com

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2 way Active Crossover

Therefore this architecture represents the simplest access I could booty and still get the adapted outcome.The band akin audio arresting enters the absorber area it is astern out of phase.This is to atone for the filters which will alter the appearance afresh appropriately abiding the arresting to it’s able phase. The filters are more-or-less accepted low and aerial canyon filters appropriately however, added capacitors and resistors accept been added in adjustment to get the altruism bottomward to a minimum appliance alone E12 components.

This alive Cantankerous over is adequately beeline forward. It consists of a absorber and two 3rd order, 18 dB per octave filters. One low canyon and the added high. The cantankerous over abundance is set at 2Khz and is advised for AEK’s 400watt per access PA/Keyboard Amp systems. Obviously alone one access is apparent here.

This ambit may not be of awfully abundant use to anyone as it was accurately advised to clothing the applications. It is not capricious or switchable for two reasons. Firstly, it didn’t charge to be back the backdrop of the apostle arrangement were already known. And secondly, the added complication was put into the accurateness of the crossover rather than it’s flexibility. The filters are akin in account to anniversary added as able-bodied as can be accepted appliance alone E12 components. If switching were to be active to accord a ambit of abundance options, a accommodation would accept to be fabricated on clarify accuracy.

The alone added way to accomplish a accepted crossover architecture and advance accurateness would apparently be to use Switched capacitor clarify architecture blocks. In theory, two 18or 24dB per octave filters could be complete such that they tracked anniversary added by actuality bound to the aforementioned clock. This would be a nice agreement but I haven’t had the befalling to prove this technology for this affectionate of application. My primary affair was the breach through of switching babble appliance such a design.

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TDA8922 Audio Amplifier 2 x 25W

TDA8922general description:

The TDA8922 is a high efficiency class-D audio power amplifier with very low dissipation. The typical output power is 2 × 25 W. The device is available in the HSOP24 power package with a small internal heatsink and in the DBS23P through-hole power package. Depending on the supply voltage and load conditions, a very small or even no external heatsink is required. The amplifier operates over a wide supply voltage range from ±12.5 to ±30 V and

consumes a very low quiescent current. TDA8922 Audio Amplifier 2 x 25W

TDA8922 features:

• High efficiency (∼90%)
• Operating supply voltage from ±12.5 to ±30 V
• Very low quiescent current
• Low distortion
• Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied Load (BTL)
•  Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL)
• High output power
• Good ripple rejection
• Internal switching frequency can be overruled by an external clock
• No switch-on or switch-off plop noise
• Short-circuit proof across load and to supply lines
• Electrostatic discharge protection
• Thermally protected.

TDA8922 aplications:

• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems
• Car audio (boosters).

TDA8922 circuit:

TDA8922 layout and pcb:

TDA8922 datasheet:

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