High quality and low price 100Wx2 power amplifier circuit

This article introduces a low × 2 power amplifier circuit STK3048A, which uses a preamplifier thick film circuit ST K30 48A (ICl) as the driving stage and a power amplifier thick film circuit STK6153 cicz (cicz) as the power amplifier. It uses high voltage power supply to improve the dynamic range , harmonic distortion is minimal. It eliminates the input capacitor to extend the frequency range with little distortion. In addition, the RC filter in the circuit (pins ⑦ and ⑨ of lcl) can also be changed to a regulated power supply. The input terminal of STK6153 adopts a constant voltage circuit. Take the output power (32V) under 8n load to reduce crossover distortion as loow. Under the action of the internal constant current source of ST K30 48A, the output midpoint voltage does not need any adjustment to meet the working requirements. The midpoint protection is drawn out from point A in the circuit. Readers can install it by themselves according to the circuit principle.