112 watt amplifier for subwoofer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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The power supply consists of a 48V midpoint transformer, a bridge rectifier and filter capacitors. The rectified and filtered output voltage is about ±35 V. The supply voltages for op-amp IC1 are stabilized at ±15 V by Zener diodes D1, D2 and resistors R19, R20. The input circuit consists of a mixer and a voltage divider formed by resistors R1 and R2, a potentiometer R3 and a buffer follower on IC1-a. Potentiometer R3 is used to set the output signal of the subwoofer to the desired level. On the operational amplifier ICl-b, capacitors C2, C3 and resistors R5, R6, a high-pass filter with a slope of 12 dB per octave is assembled.
The cutoff frequency of this filter will be l/2pRC (about 34 Hz at the indicated ratings). Resistors R8 and R7 determine the gain and quality factor of the filter. Capacitor C1 and resistor R4 constitute an additional high-pass filter with a slope of 6 dB per octave and a cutoff frequency of approximately 20 Hz. On the operational amplifier 1C 1st, capacitors C4, C5 and resistors R9, R10, a low-pass filter with a slope of 12 dB per octave is assembled. The values shown in the figure define a cutoff frequency of 72 Hz. The gain and quality factor of this stage are determined by resistors R11 and R12. The two filters described above, connected in series, form a band pass filter.
When operating from a supply voltage of ±15 V, the output voltage of the ICl-d op-amp can reach 10 V to drive transistors Q1 and Q2. Resistors R17 and R18 form a local negative feedback circuit and determine the gain of the output stage, which is approximately 3. Thus, the output voltage peaks can reach 30 V. If superbeta transistors of this type are used, then the peak output power into an 8 ohm load will be 30 x 30 / 8 = 112,5 watts. General the gain is determined by resistor R13 and common feedback resistor R14.
Publication: cxem.net
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