Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [balanced]

55 questions
6
votes
2 answers

RF transformer design rules

I am reading a book about building a HF transceiver. This book gives instruction about how to build, but not so much about the theory behind. In particular, I am exploring the following balanced modulator circuit: In the instructions there is the…
Enrico
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Convert 3V unbalanced microphone to 48V phantom balanced

I have the following circuit in an existing product, which has a microphone, power switch, LED indicator, and is powered by 2 AA batteries: simulate this circuit – Schematic created using CircuitLab The LED and power switch are nice features, and…
Eric Lindsey
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3
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2 answers

Grounding balanced secondary isolation transformer for EMI suppression

simulate this circuit – Schematic created using CircuitLab Which is the best secondary connection to clean the main line power from EMI, line noise and HF harmonics by using an isolation 1:1 230/230VAC transformer with balanced outputs: 1) A…
Gianluca G
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1 answer

Consistent failure of THAT 1646 line driver IC. What could be the cause?

I work with audio electronics in the touring concert realm and I've been seeing a gross failure of a certain balanced line driver IC, the THAT 1646. Main symptom is no output and most common failure mode is the OUTPUT pins latching to the supply…
disorder
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1 answer

How to match the length of wire for a symmetrical circuit?

I am new to my current job and one design inherited from my predecessor was as follows. I am wondering if this is the best practice to make a symmetrical circuit. I was told that the two wires (R+ and R-) should keep the same length to make a…
Peng Peng
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2
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2 answers

Driving Multiple Balanced Audio Runs Off Single Differential Op-Amp Circuit

I am working on an audio project that needs to drive 16 balanced xlr cable runs with stereo differential audio. For this purpose I am using the following op-amp circuit to produce a low impedance differential output: In this circuit R20 functions…
Emmett Palaima
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2
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1 answer

'true' balanced audio?

I was working on the below circuit, to create a balanced audio output. But have been told this creates a differential audio output, not a 'true' balanced audio output. "A true balanced output would couple interference on one leg to the other,…
R2D2
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1 answer

In what situation,we should consider the balanced bridge when we calculate the equivalent capacity?

Question: Find the value of the equivalent capacitance between \$a\$ and \$b\$ Solution:Because of the balanced bridge,so the circuit become So \$C_{ab}=30 \mu //[(4\mu // 6\mu)+((6\mu // 9\mu))]=5\mu\$ Honestly,when i see there is a \$\Delta\$…
shineele
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How to properly convert a balanced (line level) audio signal to unbalanced?

I want to connect a balanced line output of a pro grade mixer to a consumer grade power amp that only accepts unbalanced RCA aux in connectors. The mixer has balanced TRS (tip-ring-sleeve) 1/4 inch output sockets, one for each channel. If I connect…
Yudhi G.
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Shielded twisted pair balanced transmission line implementation

I want to send a signal from board 1 to 2 through 20 cm line. I have four channel in differential, First I add them, can I send them through shielded twisted pair like this: Do I need a buffer? why? Is R14 and R13 needed, since obviously the…
mohammadsdtmnd
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1 answer

How does the CMRR of a fully differential amplifier change with input impedance imbalance?

Most pro-audio microphones provide a balanced output -- this is intended to provide improved noise rejection, and provided the output and line impedances are appropriately balanced, it does. However, with conventional differential-to-single-ended…
ThreePhaseEel
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how to hard-bypass the input of a line driver with a switch?

I want to use a balanced line driver of the type DRV134 or THAT1646. With a bypass switch I want to bypass the IC and send the signal to another circuit instead. In order to null the output of the driver IC in case the switch is in the bypass…
jilski
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Decoupling Positive and Negative to Earth and Chassis Connection Layout

Very stupid question but I need to ask. I'm doing the following. The two capacitors are supposed to be used for balancing the impedance to a common ground so that the common mode noise can be reduced. I'm doing the same at the outputs. My question…
Tony
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In which direction is the microphone signal transported?

So I understand the general principle of how the audio signal is transported. I also understand that audio signals can be distinguish between AC and DC. But let's say we have a TRRS Jack like below. I will use the names in the pictures to explain. I…
Koala
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1 answer

TRS balanced audio jack insertion indicator

I'm transmitting analog audio signal from BM20 bluetooth module (it has single ended audio out L + R), to amplifier TPA3118D2. I wish to add two TRS 1/4 balanced audio output jacks (separate for L and R channels). I'm controlling AMP mute/unmute via…
Mateusz Kusmierz
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