What Is a Balanced Circuit?

The balanced circuit is a two-conductor circuit. In a balanced circuit, the impedance of the two wires and all the circuits connected to it is equal to the impedance of all other wires. A typical balanced circuit is a differential amplifier.

A balanced circuit refers to two

As shown in the schematic diagram, U1 is a voltage detection IC, U2 is a field effect transistor, and R3 and R4 are equalizing resistors. When the battery voltage reaches

Advantages of balanced circuits

1. The balanced circuit makes the noise picked up on the two wires equal. Under balanced conditions, the noise picked up by the two wires is a common mode signal that can cancel each other out in the load. The use of balance technology to suppress noise is very economical. In some applications, balance is often used instead of shielding to become the main noise suppression method.

2. Because of the relationship between the same and inverting signals, the conversion rate of the fully balanced circuit is twice that of the single-ended circuit, which is relatively beneficial to the sound quality.

3. High signal-to-noise ratio. Because the inductive signal is canceled at the circuit or load side, the ability of the balanced circuit to suppress inductive noise is unmatched by single-ended circuits. This is particularly evident in environments with long transmission distances and severe electromagnetic interference.

Disadvantages of balanced circuits

1. Under normal household conditions, the advantages of balanced transmission are not obvious because of weak electromagnetic interference and short transmission distance.

2. Due to the practical application of the balance circuit, the gain, input impedance, and phase characteristics of the same and inverting circuits cannot be completely consistent. An improperly designed balance circuit may even generate some new noise or distortion, so the main suppression of noise is Depending on the design and processing accuracy, well-made products can control various errors within a very low range.

3. Because the load of the fully balanced circuit has not changed, the output circuit has doubled, which is equivalent to reducing the load impedance of the single-ended circuit by half. Therefore, the damping coefficient and control force of the fully balanced circuit are not as good as the same configuration (power components , High-current devices such as transformers, single-ended circuits.