Questions tagged [balanced]
The balanced tag has no usage guidance.
55
questions
6
votes
2
answers
264
views
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 ...
- 561
1
vote
1
answer
79
views
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.
...
- 137
0
votes
0
answers
84
views
Single PIN photodiode in comparision with dual PIN photodiode configuration of balanced detectors
A typical balanced photo detector configuration to tackle background noise is depicted below:
There are configurations which use a new terminology and configuration like below:
Which configuration ...
- 592
0
votes
0
answers
68
views
Unbalanced output to balanced input
I have a common mic preamp scheme based on ina217. Balanced part works, but I would want to add hi-z input (ub_buf), with gain control still done via ina217. ub_buf point is a buffered unbalanced ...
- 101
1
vote
2
answers
193
views
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 ...
- 23
1
vote
1
answer
49
views
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 ...
0
votes
1
answer
140
views
Building a metal detector to detect 3mm particles
I am trying to build metal detector to
detect some stainless steel and copper and iron particles with size approximately 2~3 mm embedded on circular food product. Its diameter about 2 cm and width ...
0
votes
0
answers
368
views
How to solder two 3.7 V LiPo batteries in series and then balance charge them
For a project, I need to power an Arduino Nano 3.3 V BLE. The Nano accepts 5-21 V on its VIN pin and then regulates that voltage down to the 3.3 V it needs. To do ...
- 101
1
vote
1
answer
154
views
Symmetric audio signal output on single voltage circuit
How to implement a symmetric audio output on a small audio device using a single supply battery voltage only.
I like to drive symmetric XLR inputs, and use a symmetric connection for noise suppression ...
- 551
-3
votes
1
answer
348
views
How can I design a low cost fully differential op amp using a generic op-amp (audio purpose) [closed]
can I replace this fully differential Op-amp (OPA1632) with a generic op-amp based design ( Figure 2: Using NE5532).
The Application area is audio signal handling.
Input: Differential input / ...
- 13
0
votes
2
answers
263
views
THAT1646 Distortion on output signal
I am working on an audio project using the THAT1646 balanced output driver (project is a hi-fi mixer for studio insert gear). The project uses a bipolar +/-15V supply.
I am experiencing distortion on ...
- 425
0
votes
3
answers
538
views
Balance metal detector sensitivity for smaller pieces of metal
As suggested by Andy in these posts proximity sensor technology, range of 150mm, Metal detector "Head sensor" and How can I drive an LC tank circuit to get a nice and clean sine wave?, I ...
- 1
0
votes
0
answers
225
views
Balanced Mono XLR output to Unbalanced Stereo Input
I have an Allen & Heath ZED-10 mixer with a balanced XLR output. All signals coming into this mixer are mono and therefore we were going to use a single balanced mono XLR main output (Left channel)...
- 101
0
votes
2
answers
955
views
XLR phantom power microphone mute, redux
Wall of text? Feel free to jump to the four related questions towards the bottom!
I had a previous post discussing how to build a pop-free, electronically controlled mute circuit that goes inline in a ...
- 5,660
2
votes
2
answers
256
views
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 ...
- 425
0
votes
0
answers
611
views
Balanced to unbalanced circuit not working correctly?
I've tried to build a balanced to unbalanced signal converter with an TL072. The problem is that if I put a balanced sine signal into it I only get the bottom half of the sine as unbalanced signal out ...
- 1
0
votes
0
answers
36
views
3 phase 208v leg balance and observed KVA
I have a cluster computer system in a small server room, fed by an 80 kva capable double conversion (480v 3-phase in, 208v single phase out) UPS. This UPS has an LCD display showing voltage, leg ...
- 131
0
votes
1
answer
151
views
RS485 unmatched line - what will be the impact?
I am doing an experiment where I have a computer with an rs485 transceiver on it and data rate of 1Mbs.
an rs485 30m long with Z0 of 120ohm (also have one with Z0 100ohm).
at the end of the cable I ...
2
votes
1
answer
985
views
'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 ...
- 167
0
votes
2
answers
3k
views
balanced to unbalanced audio switch
I have an audio source input, that I am putting through the circuit below to create a balanced audio signal.
There will be one of these for each channel, left and right.
I have been asked to provide ...
- 167
2
votes
1
answer
91
views
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\...
- 541
2
votes
3
answers
15k
views
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 ...
- 527
0
votes
2
answers
551
views
Op - Amp and Unbalanced Input Differential Signal
Let's consider for instance an Open Loop Op-Amp (for instance with double power supply: VDD and -VDD), which is a good comparator circuit.
The sign of its input differential signal (Va - Vb) ...
- 3,340
3
votes
0
answers
979
views
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 ...
- 131
1
vote
1
answer
191
views
How to invert one channel of phone output?
I want to connect phone output to a car radio. It has + and - inputs. When I connect left channel to the + input, there is good quality sound, but it's not as loud as CD player. If I invert right ...
- 11
3
votes
2
answers
410
views
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 ...
- 401
1
vote
3
answers
208
views
DC Power Limiting Circuit
I would like to know how to build a power limiting circuit.
The goal is to be able to combine two PSU's with the same voltage in parallel in order to increase the Power output.
From what I've tested,...
- 11
0
votes
3
answers
140
views
Balanced Charging of ZOP 2s lithium ion battery
Good day everyone,
I recently purchased a “ZOP Power 7.4V 2200mAh 2S 35C Lipo Battery T Plug” for a project. I have designed a circuit to charge the battery, but now I am wondering if it is necessary ...
- 33
0
votes
1
answer
1k
views
Soldering XLR Cables together
I'm aware that the structure of a balanced cable is an integral part of maintaining signal quality.
If I was to solder two XLR cables together in an effort to make one longer XLR lead, what would be ...
- 123
0
votes
2
answers
147
views
Does this audio amplifier do differential filtering?
I was looking at this schematic for a two-channel audio power amplifier.
The amp supports a bridged mode by means of an XLR connector and a switch. When the switch is in the XLR position, pin 2 (...
- 161
2
votes
1
answer
362
views
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?
...
- 545
1
vote
1
answer
92
views
Balance charging connection for 2 cell li-ion
I am designing a circuit powered using two 18650 li ion cells in series, I will wish to charge it with an imax b6 charger with balance output. Is it enough to connect the 3 terminals of the charger to ...
- 79
-1
votes
1
answer
158
views
Need to convert unbalanced to differential input OPAMP
I have the following filter after the DAC chip (currently with unbalanced outputs) working very well, but I need now to change the DAC chip. The new source has differential outputs.
Is there a ...
- 401
0
votes
1
answer
64
views
Adafruit USB LiIon/LiPoly charger - v1.2, charging multiple batteries with series output WITHOUT switch?
On their documentation page, Adafruit offer a tutorial for using it with 2s li-ions. However that also required a 3pdt switch, which would have to be manually thrown. Since in my project I will not ...
1
vote
2
answers
5k
views
Why is neutral required in three phase charging of electric vehicles?
Talking about both three-phase AC as well as DC fast charging (wherein 3 phase AC is converted to DC) in EVs, I think that the 3-phase rectifier represents a balanced 'load'. Why is then a neutral ...
user172541
0
votes
2
answers
187
views
Is there such a thing as a fully differential line driver?
I'm looking to find something similar to the TI drv134 (http://www.ti.com/lit/ds/symlink/drv134.pdf), but then with differential inputs instead of single ended.
Is there even such a thing? I can't ...
- 161
1
vote
2
answers
479
views
What are the limitations of "fake" balanced audio cables?
I have an AV receiver providing amplified outputs and preamp outputs.
The pre-amp outputs are in the form of (unbalanced) RCA jacks. My speakers are amplified and have a balanced input.
I was looking ...
- 1,306
0
votes
2
answers
281
views
Balanced star 3ph system
I have balanced star three phase generator 380V with junction point is connected to ground
And current through from junction point to ground is I0=0 for that clearly say it is balanced system
when i ...
0
votes
1
answer
43
views
Calulating the total thermal power in three phase system
In my book I have following task that actually has a solution. However I do not understand the solution idea and that's why I'm asking you guys to help me understand that if possible.
Why I do not ...
- 101
0
votes
0
answers
779
views
When is it safe to ground DC- (specifically audio output)?
With regard to audio devices, if all equipment is unbalanced and there are no DC- connections to earth ground, equipment will generally operate hum/noise free despite large common mode voltages ...
- 365
1
vote
1
answer
6k
views
BMS without a balance option?
I recently received a Li-ion BMS which has a checkbox called:
Balance function: with / without
Apparently the BMS does NOT have a balance function. I want to use it with 18650 cells, the ...
- 887
0
votes
1
answer
85
views
Troubleshooting Noise/Quirks in Audio Circuit
I am working on a project that takes in a single line-level audio channel and outputs 2 balanced/unbalanced +/- outputs from that channel. I have read a number of the excellent published articles ...
- 365
0
votes
1
answer
748
views
How does noise affect an unbalanced signal on a balanced cable?
With regard to audio and balanced signals with XLR connectors, how does noise affect an unbalanced signal on the same cable that normally carries a balanced signal?
To give some background, I have a ...
- 1,649
0
votes
1
answer
62
views
Using cat5 and mic cables within same DMX512 universe
I understand that I'm not suposed to use mic cable for DMX sygnal. And that's the reason why the standard mandates 5-pin XLR connectors.
I also know that in practice 20 out of 20 events I've witnessed ...
- 184
1
vote
1
answer
157
views
Lithium Battery Pack Discharger
I'm trying to build a circuit that balance each cells from lipo battery by discharging them until all of the higher voltage cells are the same voltage as the cell lowest in voltage. Most of the time ...
- 309
2
votes
1
answer
869
views
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, ...
- 8,868
0
votes
3
answers
1k
views
Crosstalk between Wires in a single Twisted Pair
I was reading about the Twisted Pair Cables, and how they implement Balanced Line methodology to cancel out all the noise. All fine and good.
However, I just couldn't grasp this one simple doubt:
...
- 186
0
votes
1
answer
598
views
Hum Cancelling Circuit
Consider the following circuit:
I was just thinking about how connecting consumer grade unbalanced electronics together has a tendency to generate hum. For example, I have a little mixer that has an ...
- 1,440
1
vote
1
answer
3k
views
Single supply differential balanced preamp
I'm trying to build a single supply balanced preamp for an electret mic. To further complicate matters, I'd like to impedance balance the mic output to take full advantage of the preamp's noise ...
- 11
0
votes
2
answers
762
views
make a buffer balanced
i am still new to electronic and i probably have a stupid question..
i am trying to build a buffer for a piezo microphone following the project on this site:
http://www.scotthelmke.com/Mint-box-...
- 1