Balanced Audio Line Driver Circuit

Op amps in line driver and receiver circuits part 2.

Balanced audio line driver circuit.

Open in new find other audio line drivers description. The response graph shows the measured frequency response with the differential feed a balanced line driver figure 1 and receiver figure 2. Balanced line drivers vs. The first article in this series analog dialogue 26 2 covering general line driving and buffer design considerations gave examples of video line driver and receiver designs.

If one of the cores is grounded as in the cheaper type of balanced driver. The chief advantage of the balanced line format is good rejection of external noise when fed to a differential amplifier. However in some cheaper balanced line drivers one core does not carry any signal but is grounded instead. Floating balanced line drivers.

This balanced audio driver consists of high performance op amps with on chip precision resistors. A balanced line driver ssm2142 features transformer like balanced output drives 10 v rms into a 600 v load stable when driving large capacitive loads and long cables. The audio input should be an unbalanced professional 4dbu line level audio signal. The drv134 and drv135 are differential output amplifiers that convert a single ended input to a balanced output pair.

The mini board converts unbalance audio signal into balance audio signal the project is based on ssm2142 or drv135 ic which are differential output amplifier that converts a single ended audio signal input to a balanced output pair. In this article we consider audio line drivers and receivers. They are fully specified for high performance audio applications. These balanced audio drivers consist of high performance op amps with on chip precision resistors.

The signal is 1db down at 10hz and 30khz which is pretty good considering the overall simplicity of the circuits. By walt jung and adolfo garcia download pdf. There is nothing to grumble at but there is one essential difference between an output like the described one and a transformer coupled one. Goes to the next circuit s audio input or ts tip ground unlabeled on pcb goes to the next circuit s audio ground or ts sleeve balanced output.

The following data taken from the thd test circuit on an audio precision system one using the internal 80 khz noise filter demonstrates the typical performance of a balanced. You can wire the balanced output directly after an unbalanced circuit or to a ts 2 pin 1 4 jack. So in this case amplifier 2 is left out and the left hand side of resistor r2 is grounded. The common mode output resistance a common voltage applied to the output will cause a considerable common mode current into the.