Questions about designing electronics for measuring, processing, and amplifying audio signals.
2
votes
1answer
120 views
Emitter resistor - why?
I was told to add an emitter resistor to the transistor T1. I'ver been researching the subject and could only find vague info about the E resistor and now I'm utterly confused. The transistor here ...
0
votes
1answer
42 views
Loudspeaker transducer FCC certification?
Is FCC certification necessary for speaker transducers that are sold as assembled units in their housings?
I found information on active speakers needing fcc certification, but what about passive ...
-1
votes
0answers
67 views
Solid state relay like switch
I'm asking this question because I want to implement a switching system in my guitar effects pedals.
What I want is the closest thing to a mechanical switch but that can be controlled by electronic ...
0
votes
1answer
45 views
Bandpass audio filter in combination with PGA2311 analog ouput pins
I am working on modular preamp and I have Digital&Analog Power Supply, motherboard with CPU and Volume Control daugtherboard. On Volume Control Daughterboard there is an PGA2311 Volume Controller ...
4
votes
4answers
63 views
How are speakers matched with audio amplifiers? (avoiding overloading either)
I know a similar question title has been asked, but I believe that does not answer my question (and I couldn't think of a better way to phrase the question).
I'm a bit confused by how exactly an amp ...
1
vote
2answers
38 views
Mobile microphone input data throughput via audio jack?
does anyone know how much data could be transferred through audio jack for app to process into bytes?
I'm wondering how many different buttons could be mapped and processed using mic input? (Many ...
0
votes
0answers
73 views
Control audio volume with a micro controller
I have an old amp that has no remote control. I already played with arduino IR library and it was pretty easy in using a IR module.
I want to control the input level before it goes to the amp input, ...
0
votes
2answers
62 views
How do I Implement Soft Clipping in an Audio Circuit? Or should I just Attenuate the Signal?
I am designing an audio circuit that takes in line-level audio, amplifies the audio using an amplifier (most likely this 3.1w amp - http://www.ti.com/product/tpa6211a1#parametric) and outputs the ...
0
votes
2answers
70 views
Matching Audio Amplifier with Speaker (Watts Rating/Output)
Background
When selecting an amplifier and speaker, you are usually provided ratings or output in watts. For a speaker you get maximum and nominal watts rating, while for an amplifier you get output ...
1
vote
1answer
37 views
Stereo line level to mono microphone level
I need to find a simple (preferably passive) way to take a stereo consumer line-level output, mix it to mono, and reduce it by 40dB to be used in a microphone level.
Following this answer: ...
0
votes
0answers
31 views
Average flux density in a standard pair of headphones? (AC fields only)
I don't have a teslameter to measure it, so can someone with expertise give an approximate as to what the flux density may be next to one speaker elements in a normal pair of studio earphones (not ...
1
vote
2answers
94 views
Does this type of amplifier, IC or component exist?
I am developing a circuit that has as an input a line-level audio signal, it then boosts the signal using either an op amp or transistor so that line-level (which is around 1.6v) is boosted to what my ...
0
votes
2answers
43 views
Unamplified AND Amplified input on the same speaker
I would like to at night use just my (unamplified) phone as signal for two speakers.
However, I also want to use them with an amplifier. To do so, would I need to just switch between the + cables, ...
2
votes
1answer
107 views
Simple circuit to boost line-level audio
I am looking for suggestions or pointers to a simple circuit that boosts line-level audio, so that it is strong enough to use with the ADC peripheral on my MCU.
I am aware and have seen many that use ...
2
votes
1answer
47 views
Amplifying a Piezo with an Op-Amp
I am trying to use a piezo as a speaker.
(I know that a piezo has a bad frequency-response. However, In my application it is better to use one instead of a speaker, since normal speakers don't like ...
