Tone blocks of high-quality stereophonic bass amplifiers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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The timbre blocks of high-quality stereophonic bass amplifiers can be made using the circuits shown in Fig. 5 and 6. In the first of them (Fig. 1), a passive bridge regulator is used to change the frequency response, and the microcircuit serves to compensate for the losses introduced by it at medium frequencies, in the second (Fig. 2) the bridge regulator is included in the OOS circuit covering the microcircuit ( active controller).
Ris.1
Ris.2
The range of tone control at frequencies of 40 and 16 Hz of the first device is +/-000 dB, the second is at least +/- 15 dB. The transfer coefficient of both devices when the resistor sliders are set to the middle position is 12, the uneven frequency response in this position of the sliders depends on the deviation of the parameters of the elements from those indicated in the diagram and, if this deviation does not exceed +/-1%, is approximately +/-5 dBV frequency range 1...20 20 Hz.
The advantage of an active tone control is the possibility of using variable resistors of group A (in the regulator according to the circuit in Fig. 1, they should be of group B). For normal operation of both devices, the output impedance of the previous stage must be small (no more than 2 kOhm).
The examples considered, of course, do not exhaust the possibilities of using the K548UN1 chip in sound recording and playback equipment. With no less success, it can be used in mixing consoles, active filters, multi-band tone controls, etc.
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