Chip A, in my opinion, is the best of the currently existing integrated power amplifiers. With such important indicators as output power and harmonic content of it far outperforms other commercially available integrated amplifiers. The proposed stereo USC based A has a low harmonic distortion and high output power.
Parameters USC Output power, W - at PH=4 Ω 2 × 180 - when RL=8 Ω h Harmonic distortion,% not more than 1 The voltage, V ± 22
On the chip DA1 assembled pre-amplifier, tone controls, volume and balance. Resistors R1 and R2 are used to adjust volume and balance, respectively, a, R3 and R4 is to adjust the tone. Further, the signal CC is on the chip DA3, DA4, "rock" transistors VT1 ...VT4. They should be mounted on heatsinks. Diodes VD1...VD4 can be any medium power. The received signal CC high power is supplied to the load BA1 (BA2). The power of the speaker should be at least 200 watts at 4 Ohms and at least 100 watts at 8 Ohms.
This USC can be used in discos, for scoring large areas or rooms.
P SYCH, p. Orekhovsky, Brest region
(RL 3/99)