Novel hybrid BTL amplifier 02

shown (only one
channel is drawn). vl and V2 form a typical
SRPP preamp circuit, which has a higher gain to compensate for the loss of the signal
caused by the attenuated tone
circuit behind it . There are two reasons for choosing the attenuated tone circuit: first, because the circuit is simple, stable, and does not require debugging; second, because the attenuated tone circuit will not cause adverse phase shifts to the original signal, making the final output signal well positioned. V3 is an inverting stage, outputting two signals with opposite phases to drive the BTL power amplifier circuit composed of Icl and 1C2 respectively. IC1 and IC2 use the high-performance and high-power integrated circuit LM3886 launched by the National Semiconductor (NS) Company of the United States. , this circuit adopts advanced overvoltage, undervoltage, short circuit and other protection circuits. A BTL circuit composed of two such power amplifier integrated circuits can provide a continuous average power of more than 100w for an 8n load under the condition of 30V power supply. .