Compared with voltage negative feedback amplifiers, current negative feedback amplifiers have excellent nonlinear distortion and transient intermodulation distortion characteristics, the frequency curve of the amplifier is flat, and the response of high and low frequency is broadened; more importantly, this circuit will The load impedance is included in the feedback network, so it can compensate for loads such as speakers with sharp impedance changes, and the working performance is stable and reliable, so it has more advantages than voltage negative feedback amplifiers, so current negative feedback amplifiers are widely used In modern high-fidelity audio amplifiers.
The circuit in Figure 1 is a 100W × 2 DC servo current negative feedback stereo power amplifier with excellent performance and perfect design. It is composed of two TDA7294s and has a frequency response of 10 Hz to 100 kHz. Use precision audio dual op amps as two-channel power amplifier DC servo output. The speaker protection special chip μPC1237HA drives the relay to complete the switch mute and the amplifier output DC offset speaker protection. When the AC power supply is plugged in, the relay delays the speaker connection to the power amplifier after a period of time; when the AC power supply is disconnected, the μPC1237HA detects the AC power loss and immediately disconnects the relay from the speaker, so the power amplifier completely eliminates the transition process of power on The impact noise of the speaker.
In actual use, considering that the fluctuation of the mains grid causes the amplifier rectified output voltage ± Vs to fluctuate greatly, in order to avoid damage to the TDA7294 under overvoltage and high temperature conditions (note that the withstand voltage value is at a temperature of 25 ℃, if the operating temperature exceeds At 25 ° C, the withstand voltage of TDA72294 will decrease accordingly). It is recommended that the secondary voltage of the AC power supply transformer be AC26V × 2.
Audition: The speaker uses B & W 601, the CD machine uses Marantz CD-19, and the contrast amplifier is the TDA 7294 voltage negative feedback standard line. The program software is divided into Cai Qin's "Golden Films" to test the vocals, Mute "The Song of the Wanderers" to test the string, RR's "Tutti" to test the dynamics, Rubinstein's "Chopin Nocturne" to test the piano. The results are as follows:
In terms of dynamic speed and other hard indicators, the two power amplifiers are quite close, but the negative current feedback on the timbre is obviously sweeter; the rendering of string software and vocal software has a tendency to be warmer and more detailed; due to the current negative feedback circuit Impedance compensation characteristics, the output of the low frequency band with high impedance has been strengthened, so it has obvious advantages in low-frequency strength and diving depth.
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