Tagged Questions

-2
votes
1answer
134 views

Easiest Way to Split Audio [closed]

I'm looking for the easiest way to split audio, and I couldn't find a splitter ic. I'm using an msgeq7 that combines the two channels, and I like to have a splitter before its combined so that I can ...
3
votes
1answer
255 views

Low-pass filter on microcontroller output

I'm producing a signal which contains 7 frequencies using a microcontroller with a DAC. the frequencies are 16.5kHz 16.7kHz 16.9kHz 17.2kHz 17.4kHz 17.6kHz 17.8kHz. and sampling frequency (at the ...
4
votes
2answers
240 views

Removing DC wander in the offset of a DC-biased audio signal

I'm trying to read an audio signal from an Android phone as a serial input to an MSP430G2553, adapting this design to use the MSP430's onboard comparator module instead of an LM324. The Android code ...
0
votes
1answer
185 views

USB ground on MSP430 Launchpad interfering with Comparator_A input voltage

I'm trying to read an audio signal from an Android phone as a serial input to an MSP430G2553, adapting this design to use the MSP430's onboard comparator module instead of an LM324. The Android code ...
1
vote
2answers
124 views

converting lots (100+) of analogue audio sources to RTP/UDP/'IP packets'?

I was 50/50 posting this here or another board.. hopefully it's in context and maybe I can get some help! Basically I have a scenario where I'll have just over 100 analogue audio sources (50 in and ...
2
votes
1answer
1k views

How to read data from a 3.5mm headphone jack?

I was searching for a way to read data from a 3.5mm hack using an Arduino, but I couldn't find a well-detailed, beginner-friendly, tutorial on how to make this, at least how to wire everything and ...
0
votes
2answers
195 views

Simulate Headphone Load

I'm working on a low power (portable) audio mixing console, fed by audio signals from MP3-Players and mobile phones. There should be an option to monitor the sound, but as soon as I route one sound ...
-1
votes
2answers
1k views

Convert an analog audio signal to digital with a PIC and send the data through serial to a PC

I want to convert an analog audio signal to digital signal and send it to serial input in my computer. How can I do this? Microcontroller used: PIC18f452
1
vote
1answer
87 views

Audio Capacitor Values

I'm looking to stock my capacitor drawers and I was just looking through trying to find standard values or some kind of list for them and I couldn't find a really good list of standard values for ...
6
votes
3answers
1k views

How can one pair of headphones be connected to two audio sources?

I'd like to connect one pair of headphones to the headphone jack on two audio sources simultaneously. I realize I can't just wire two audio sources in parallel since they'll then be driving each ...
1
vote
2answers
252 views

How does audio get transmitted from my iPod to speakers?

I need some help understanding a simple concept. I understand that my iPod/any other audio device sends electrical signals to my speakers/headphones. From my research so far, an analog signal is ...
3
votes
1answer
197 views

How do i switch small AC signal on/off electrically

Suppose, i have an audio signal source. I want to connect and disconnect it to amplifier electrically (for example controlled by another source, like microcontroller, sensor, 555, etc). I don't want ...
1
vote
1answer
165 views

What potentiometer should I use for this phono pre-amp?

Please consider this DIY phono pre-amp. The text states, that resistors R9 and R22 may be exchanged for potentiometers for gain control. Since the circuit uses 1.2kΩ resistors for R9 and R22, I ...
2
votes
2answers
1k views

Phone line to 3.5mm audio line

I need to splice out the audio feed from the hand set line (4P4C jack) to a 3.5mm audio port on a computer to interoperate the call via speech recognition. I do not meddle around too much with analog ...
1
vote
1answer
153 views

How is it possible to feed the output signal back to input using a TRRS connector

I want to be able to "play" the output signal back to the device (in my case an XPERIA X10 which i think uses a standard TRRS plug) so that everything that is output by the device comes back to it. ...
2
votes
2answers
158 views

Low voltage 2 channel stereo analog switch

I am looking for a ultra low voltage 2 ch stereo analog switch. I have two headphone audio sources that I need to switch between. It is very important that the chip can run of a 1.2v rechargeable cell ...
3
votes
1answer
923 views

Is there any way to feed a signal (line-in) into a mobile phone?

My first post here, so please point out if I say anything silly. I'm working on an audio application for mobile phones. At this point in time I'm trying to measure audio latency of a mobile device by ...
5
votes
3answers
502 views

Cheapest reverb to stick in analog audio circuitry?

What are the cheapest (<$5 in large quantities) reverb implementations you can think of for interfacing with analog audio circuitry? It can be crappy but, of course, better is better.
8
votes
6answers
2k views

Inexpensive solid-state variable resistor

I have an analog audio project I'm playing around with designs for and it will need about 150 solid-state variable resistors. I plan to control these from a micro controller so a digitally controlled ...
3
votes
3answers
458 views

Analog, discrete component fade-in

This is probably a very easy question, but I've been trying for several weeks now to create a simple circuit that "fades in" some LEDs using only discrete components like resistors, capacitors, ...