Mixed connection of acoustics to combined amplifiers (2 options). Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Mixed connection of acoustics to combined amplifiers (2 options). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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The amplifier of these radio tape recorders can be used in two versions - as a two-channel bridge with a maximum power of 2x25 W or as a four-channel with a conventional load connection and a "virtual ground". The power in this case is 4x7W. The most famous representative of this family is Sony 1253/1853. To work with a subwoofer, you must also use a two-channel configuration.

Rice. 2 (click to enlarge)

The choice of switching circuit, as in the previous case, is made taking into account the sensitivity of the heads. For option А capacitors C1, C2 play the role of HPF. They can be abandoned if the used heads provide undistorted reproduction of low frequencies. The separation of the DC component is carried out by the internal capacitors of the radio. However, for the option Б it is obligatory to have two high-pass filters for stereo channels and a low-pass filter for the sum channel. Their task is to exclude the parallel operation of the heads at low frequencies. Because the drivers have almost equal DC impedance at low frequencies, the absence of filters can lead to an overload of an amplifier designed for a 4 ohm load. For stereo channels, filters of the first order (C1, C2) are used, for the total - of the second (C3L1R1).

Another variant of mixed load connection is also possible, but already within the same amplifying channel. It is convenient for connecting a two- or three-way speaker system. For the woofer, a bridge connection is used, and for the midrange / treble or treble - the usual one. The mode switch is set to the position for a four-channel configuration.

Rice. 3 (click to enlarge)

The dependence of the power supplied to the heads on the position of the fader is shown in Fig. 3.b. In the process of regulation, the power on the bridge load is reduced by a maximum of 6 dB (4 times), since in the extreme positions of the fader the circuit is reduced to the usual one ("the amplifier arm left without a signal" acts as a "virtual ground"). It should be taken into account that in the zone of joint action of the heads they are connected in parallel, but since these frequencies are already affected by the increase in the load impedance due to the inductance of the voice coil, there is no real overload of the amplifier.

Author: A. Shikhatov; Publication: bluesmobile.com/shikhman

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