All Questions
213
questions
7
votes
3
answers
514
views
Audio amplifier for school project
For a school project, we have to explain this design of a audio amplifier. We have only been able to understand to parts marked with colored rectangles.
The design comes from the book audio power ...
- 79
0
votes
3
answers
122
views
Why is there a greater lag in Bluetooth headphones compared to wired?
The Usual Answers and Responses:
Encoding, Compression, and Buffering
The typical answer to this on the internet is because Bluetooth headphones require the conversion of one form of data information ...
- 111
0
votes
0
answers
73
views
Automatically Vary LFO Speed Resistance Value
I have a basic tone generator circuit with LFO speed controlled by a 50K pot (variable resistor). I would like this resistance to fall (or rise, but I guess fall might be easier) after the circuit has ...
- 1
0
votes
1
answer
41
views
Can I connect two speakers to a mono analog input Class-D audio amplifier
I am using LM4670SD/NOPB in my design. The chip supply voltage is 5 V. My question can I connect two speakers to this amplifier as shown below. If yes what are the things to be taken care.
- 2,593
0
votes
1
answer
48
views
Earphone audio level quiet and microphone not working
I am trying to connect wired earphones to a SIM800 GSM modem so the user can talk over phone calls. After a successful test with a terminal block and hand-soldered connectors, a PCB was designed. The ...
- 5
0
votes
0
answers
72
views
Why does the ES8374 have 5 pins to receive input from a microphone?
I am using a ES8374 codec for an audio application. I am not able to make out how to connect my analog condenser mic (which has two pins) to the ES8374 mic pins. (Refer to pictures from the datasheet)
...
4
votes
2
answers
267
views
Amplitude inversion circuit
I am a beginner in electric circuit building and I am trying to build a specific circuit aimed for audio transformation (guitar efx pedal, euro rack etc). I have built a number of implementations of ...
- 41
0
votes
4
answers
240
views
How can I remove DC from an audio signal?
I am trying to "isolate" an audio signal that is transmitted on top of a 24V (DC) power supply voltage.
This construct is used in door intercom systems from TCS.
The audio signal is the ...
- 141
0
votes
0
answers
67
views
Capture audio from TCS Intercom BUS
I try to monitor and capture audio on a TCS Intercom.
There a several projects out there who have revers engineered the bus protocol.
I got it working to see activity on the bus when someone rings the ...
- 141
0
votes
1
answer
120
views
Do we need to guard the input traces of an audio power amplifier?
This is a continuation of this question. I am using an LM4670SD/NOPB in my design. The IC has a 5 V supply.
The input of the power amplifier (+IN & -IN) comes from a smart module from Quectel.
...
- 2,593
0
votes
2
answers
72
views
Audio Power Amplifier Layout clarifications
I am using LM4670SD/NOPB in my design. The IC is working at 5 V supply.
This IC requires an 8 Ω speaker.
My first question is,
In that case do the lines Vo1 and Vo2 needs a differential impedance of ...
- 2,593
0
votes
0
answers
35
views
Impedance matching: headphones out / hijacked op-amp pin -> guitar input
I have a Vox "amplug" pocket amp which has a female 1/4" mono input, it's supposed to be dangling directly from the guitar's output jack, and has 3.5mm TRS headphones out. I'd like to ...
- 113
2
votes
2
answers
106
views
Something about the impedances of charge amplifiers
it is my understanding that due to the effect of virtual grounding, the input impedance of a charge amplifier is basically zero. If that's the case, then is there any reason to even worry about the ...
0
votes
0
answers
75
views
Fine-Tuning a Circuit After changing VCA (SSM2641 to SSI2164)
A friend's accident led to a fried SSM2641 VCA in an Eurorack audio module. Determined to give it a new lease on life, I'm diving in, though VCAs are not my forte.
After searching for hours, it seems ...
1
vote
1
answer
44
views
Audio Crossfade MN Taper-like solution
I'm trying to find a solution for the following problem:
I have a RETURN section of a circuit that has to mix a DRY and a WET audio signals.
The circuit is Stereo.
The tricky part is that i want the ...
- 53