PC Audio Amplifier With Sub Woofer

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Maurice Riley
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1 PC Audio Amplifier With Sub Woofer User s Manual (need rev 2 photo) Revision 2.0 Thursday, March 27, E. S a w g ra s s R d S a ra s o ta, F L (9 4 1 ) F A X(9 4 1 ) Copyright(c) by ACS, Sarasota, FL ALL RIGHTS RESERVED

2 Overview: Thank you for purchasing the ACS PC Audio Amp w/sub Woofer Module; be assured that it will provide you with thousands of hours of trouble free, solid-state operation. The ACS PC Audio Amp w/sub Woofer Module is designed to provide a cost effective speaker drive system for embedded PC applications. Although it can be used with any line level audio signal, its 5-1/4" disk drive power & 1/8" stereo input connectors allow direct connection to most PC motherboards. The 4 pin.1" pitch header and individual volume controls, allows direct audio connection to CD & DVD ROM drives. Features: The ACS PC Audio Amp w/sub Woofer Module incorporates the following features: Disk Drive style connector for external 12V DC power input 1/8 phone plug stereo input and output connectors. 4 position 0.1 header for stereo input. Individual volume controls. 6 position 0.1 header for speaker outputs. 10 position 2-piece terminal block connector for power input and speaker outputs Connections The ACS PC Audio Amp w/sub Woofer Module receives its power from the disk drive style connector PWR or the terminal block connector TERMBLCK. Two different input connector styles are provided: a 1/8 stereo phone jack LINE_IN and a 4 position 0.1 pin header AUDIO. The speaker outputs are available on a 6 position 0.1 pin header SPKR, or the terminal block connector TERMBLCK. Additionally, the Left and Right speaker outputs are provided on a 1/8 stereo phone jack AMP_OUT. See the Mechanical section for connector locations. Pin number 1 is denoted by the silkscreen markings and/or the use of a square copper pad for the pin. Power The ACS PC Audio Amp w/sub Woofer Module uses an external power supply. The required supply is 12 volts direct current provided via the PWR input connector or by the first two pins on the TERMBLCK connector. The connector style is the mating connector for the PC power supply disk drive connections. DC 1 +12VDC 2 GROUND 3 GROUND 4 +5VDC 2

3 Outputs The ACS PC Audio Amp w/sub Woofer Module provides three speaker outputs. The RIGHT and LEFT channels are amplified versions of the RIGHT and LEFT inputs respectively. The WOOF channel is a composite signal from both the RIGHT and LEFT inputs that is low pass filtered at 160Hz. The SPKR connector is a 6 position, 0.1 pin header. The pinout is shown in the following table: 1 RIGHT + 2 RIGHT - 3 WOOF + 4 WOOF - 5 LEFT + 6 LEFT - The TERMBLCK connector is a 10 position, piece terminal block connector. The pinout is shown in the following table: 1 +12VDC 2 GROUND 3 LEFT + 4 LEFT - 5 WOOF + 6 WOOF - 7 RIGHT + 8 RIGHT - 9 n/u 10 n/u The AMP_OUT connector is a 1/8 miniature stereo phone jack. The pinout is shown in the following table: TIP RING SLEEVE LEFT SPEAKER RIGHT SPEAKER GROUND Inputs The ACS PC Audio Amp w/sub Woofer Module provides left and right stereo inputs. The LINE_INPUT connector is a 1/8 miniature stereo phone jack. The pinout is shown in the following table: TIP RING SLEEVE LEFT INPUT RIGHT INPUT GROUND The AUDIO connector is a 4 position, 0.1 pin header. The pinout is shown in the following table: 3

4 1 GROUND 2 RIGHT 3 GROUND 4 LEFT Amplifier The ACS PC Audio Amp w/sub Woofer Module uses the National Semiconductor LM1875T amplifier IC. There are three amplifiers, one each for RIGHT and LEFT channels, and a third for the WOOF channel. There is a trimpot style volume control provided for each channel. The LM1875T can deliver up to 20W into a 4 or 8 ohm load with a larger power supply. When using the PC's 12V power supply, the LM1875T can deliver about 3.5 watts per channel to an 8 ohm speaker. Louder volumes can be achieved by using 4 ohm speakers. An electronic crossover is used to mirror any frequencies below 160Hz from both the RIGHT and LEFT channels to the additional WOOF channel. Larger diameter speakers with a properly designed enclosure are required to take advantage of the Sub-Woofer channel. Power filtering and conditioning is performed on the PC's 12V, to reduce background noise levels. 4

5 Mechanical Maximum component height is 1.2 at the three vertical heatsinks. 5

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