Intermediate sound card amplifier. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Computers

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A necessary part of a modern computer is the Sound Blaster. It allows you to get sound accompaniment of programs. Most of the sound cards (boards) for computers of the IBM family in the world have recently been produced without a powerful final amplifier and are designed to connect active speakers or any amplifying complex. This allows for better sound quality and avoids overloading the computer's internal power supply.

Having little experience working on a personal computer, it is easy to purchase and install a sound card in any free slot of the corresponding connector on the motherboard (inside the computer case). There is a large selection of sound cards in stores - from complete ones in a set that includes speakers to individual units. Buying a set is much more expensive than buying the same separately. And not everyone is able to satisfy the complete set of the set with the quality of the components, for example, the incoming speakers. But by purchasing all the components separately, there is a risk of incompatibility of nodes. So, having bought a good sound card from "Creative" and excellent-sounding speakers SP-690 (50 W) from "Advance", when they were connected together, two drawbacks were discovered. Firstly, the signal from the sound card is insufficient in level to get maximum power from the speakers. The second drawback was a strong click in the speakers when the computer was turned on.

The circuit shown in fig. 1. The nodes of the amplifiers US1 and US2 are identical. Each channel provides 7,5 times amplification in the frequency band 20...100000 Hz. Capacitor C4 in the base circuit of the transistor VT3 gives a smooth increase in the supply voltage to the amplifiers - this eliminates the passage of a pulse surge from transients. The intermediate amplifier can be powered from the computer power supply, for which you need to install a miniature X12 connector on the rear wall of the case, connected to the +4 V circuit of the power source. The current consumption of the circuit is not more than 6 mA.

The circuit used parts: capacitors C1 ... C4 type K53-1B, resistors of any type. The X1 plug must fit the sound card connector, the X2 socket of the ONP-VG-68-8/16, 5x14-R or similar type, for connecting the plug of active speakers, XZ - any small-sized one. The topology of the printed circuit board and the arrangement of elements on it are shown in fig. 2. Setting up the circuit consists in obtaining the same gain in the channels by selecting the value of the resistor 1R6 (2R6) within 200 ... 1500 Ohms (the value of negative feedback is adjustable).

Publication: cxem.net

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