Balanced Audio Line Driver Circuit

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Balanced audio line driver circuit.

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. These balanced audio drivers consist of high performance op amps with on chip precision resistors. They are fully specified for high performance audio applications. 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. 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. The common mode output resistance a common voltage applied to the output will cause a considerable common mode current into the. Balanced line drivers vs.

Balanced unbalanced converter for audio work. There is nothing to grumble at but there is one essential difference between an output like the described one and a transformer coupled one. The response graph shows the measured frequency response with the differential feed a balanced line driver figure 1 and receiver figure 2. The line driver rod describes in his article is quite simple too.

This balanced audio driver consists of high performance op amps with on chip precision resistors. Op amps in line driver and receiver circuits part 2. You can wire the balanced output directly after an unbalanced circuit or to a ts 2 pin 1 4 jack. The chief advantage of the balanced line format is good rejection of external noise when fed to a differential amplifier.

The audio input should be an unbalanced professional 4dbu line level audio signal. By walt jung and adolfo garcia download pdf. The drv134 and drv135 are differential output amplifiers that convert a single ended input to a balanced output pair. Floating balanced line drivers.

So in this case amplifier 2 is left out and the left hand side of resistor r2 is grounded. However in some cheaper balanced line drivers one core does not carry any signal but is grounded instead. 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. The signal is 1db down at 10hz and 30khz which is pretty good considering the overall simplicity of the circuits.