KMTech 7.1 Surround Power Amp TDA7851A 8 x 40With72W install in PC drive bay v2.03

  

From KMTech Design - a 7.1 channel surround power amplifier that installs inside your 5.25computer drive bay. (MOST NEWER COMPUTERS SHOULD BE 7.1 COMPATIBLE). A 10cm x 10cm 4-layer circuit board, designed in the UK and made of FR4 self-extinguishing material. Extremely affordable - a quality 7.1 power amp for less than the cost of a stereo equivalent. Compact and tidy - fits into a 5.25 drive bay, practically invisible.

Powerful - 8x40W (up to 8x72W with 2 ohm speakers). Fill your entire room with 8 channel surround sound! Also compatible with 5.1/2.1/2.0 games/movies. Superior quality sound - uses a pair of ST Microelectronics TDA7851A MOSFET quad bridge power amp ICs that are fitted to high-end automotive equipment.

A really great little low-noise surround system! This is a compact, high-quality and innovative eight-channel surround sound solution especially developed to complement today's demanding gaming and multimedia computers. This amplifier has been designed to install inside a 5¼ drive bay of a personal computer tower system. Most towers have at least one drive bay free for this purpose. The amplifier takes its power from the +12V DC rail of the computer power supply unit, and a Molex power connector is fitted to the board for this purpose. The amplifier sports 2 x 40W high-efficiency 4-channel amplifiers. As far as distortion is concerned, a THD+N figure of around 0.1% should keep the most discerning gamers happy. The TDA7851A is a breakthrough MOSFET technology class AB audio power amplifier, designed for high-power car radio. The fully complementary P-Channel/N-Channel output structure allows a rail-to-rail output voltage swing.

This, combined with high output current. And minimized saturation losses, sets new power references in the car-radio field, with unparalleled distortion performance. Useful attributes in road vehicles, these characteristics are also valuable in that other well-known electrically harsh environment, the PC computer with it's switch-mode power supplies.

Fitted with a heavily finned 50x20x10mm aluminium heatsink and a 20mm square 12V fan. The assembled device is mounted on a 5.25" to 3.5" converter bracket as shown in the photographs. The simplest way to connect a subwoofer is to use a passive sub. Alternatively you can use an active sub with speaker lever inputs, or a speaker level to line level convertor. This amplifier must be fitted inside a computer tower system with the following specifications.

Free 5¼ drive bay, preferably with two inches clearance below the bay for future cooling fan installation. HD surround processor (audio chipset) capable of 7.1 channel audio (check your user manual if you are not sure). 3.5mm stereo jack socket outputting line-level front left/right audio signals. 3.5mm stereo jack socket outputting line-level side left/right audio signals.

3.5mm stereo jack socket outputting line-level rear left/right audio signals. 3.5mm stereo jack socket outputting line-level centre/LFE (subwoofer) audio signals. 8A overhead on the computer power supply +12V DC rail (if not using auxiliary DC socket). This amplifier board needs a 12V DC power supply, of minimum 8A. This can be taken from the computer power supply unit using one of it's Molex plugs. There is a 4-way connector fitted to the rear of the amplifier main board for this purpose. If the power supply unit on the host computer does not have 8A spare capacity, then there is facility for an auxiliary power connector on the rear of the board into which wires can be soldered, or 5mm terminal blocks can be used. Of course upgrading your PSU to a 500W or 750W is another option. Again, any power supply connected to the auxiliary power socket must be rated at 8 Amps minimum.

There is an onboard capacitor for bypassing noise produced by the power supply. Connect this amplifier to your PC you will also need.

4x 1m 3.5mm stereo TSR male-to-male patch cable. 7x 2-8 ohm minimum 50 Watt speakers. Minimum 50 Watt passive subwoofer (or active sub with speaker level inputs). 8A "wall wart" power supply if not powering from PC supply.