Tagged Questions
1
vote
1answer
80 views
Can I convert audio signals from an iphone to electrical signals to control another device?
I wish to design a mobile app that will allow me to touch parts of the screen, generate a music tone that will be converted to an electrical signal to move part of a toy. By touching different parts ...
4
votes
3answers
483 views
80's Cassette Line to Microphone Level for iPhone
This is a followup question to this one: Using an iPhone as a cassette recorder for 80's home computer
I'm trying to record from an 80's home computer (a Microbee) into an iPhone. Although I ...
4
votes
3answers
979 views
IR to audio converter (frequency and level)?
What kind of IR detector and converter circuit could be used to down-convert an IR remote signal (in the neighborhood of 35 to 45 kHz) into audio frequency signals (0.1-20 kHz) of the appropriate ...
4
votes
1answer
7k views
What is the voltage range of a standard headphone jack from a phone?
I want to connect the output from the audio jack of an iPhone to an Arduino.
What voltage range can I expect to see on the audio lines from the iPhone? I assume that turning the volume up on the ...
1
vote
2answers
401 views
How can extend the cable distance from a condenser microphone to the ADC without loosing fidelity?
I am new here so please forgive me for a vey basic question. I have a TASCAM iM2 in my possession. This is a stereo condenser microphone coupled to an ADC that connects to the the latest iPhone models ...
1
vote
1answer
251 views
Mobile phone TRS output to microcontroller digital input?
How should a mobile phone headphone audio output (such as the jack on top of an iPhone) be interfaced to a microcontroller digital input? (3.3V controller. Assume no audio frequency capable A/D is ...
4
votes
2answers
2k views
Digital input to mobile phone headset port?
This seems to be a common smartphone project, but I haven't seen circuit diagrams with explanations.
What filter network (or resistor network, or other buffering circuitry) should be used to connect ...
3
votes
1answer
402 views
Data modulation over Bluetooth headset profile?
What kind of data modulation schemes might be suitable for sending data to/from a Bluetooth audio headset? e.g. What kind of data modulation would likely survive the audio compression schemes and ...
1
vote
1answer
1k views
How to wire sennheiser headphones to an iphone headphone cable
I have a pair of these (or something very similar) :
The plug failed so I chopped it off and was hoping to wire it to a plug on a spare pair of iPhone headphones I had kicking around. Both sets of ...
1
vote
1answer
2k views
How could you detect a microphone attached to a smartphone?
I've a circuit that makes sounds through an a standard audio jack (3.5mm) and I would like to connect it to a smartphone (let's say iPhone).
When I connect it to an iPhone, it will be detected as ...
7
votes
2answers
1k views
Transfering data using ultrasound
Yamaha InfoSound and ShopKick application use technologies that allow to transfer data using ultrasound. That is playing an inaudible signal (>18kHz) that can be picked up by modern mobile phones ...
3
votes
1answer
1k views
line-level audio into an iPhone headset jack?
What level and/or impedance matching (or pre-amp) circuits should be used to send a line-level audio signal into the mic input ring of an iPhone headset jack with minimal distortion and/or loss?
