This tag is for questions about designing electronics for measuring, processing, and amplifying audio signals. Questions about debugging or repairing consumer audio players and speaker setups will be closed as off-topic.
1
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3answers
179 views
How do I easily power a “mashed-up” project?
I'm working on a hobby project that involves a Raspberry Pi (with a powered USB hub for reliable wireless), an Arduino (driving a hobby servo, controlling some LEDs, etc.), and an audio amplifier (not ...
1
vote
1answer
71 views
How to choose a capacitor for filtering an audio signal?
I've recently become interested in analog synthesizers and have successfully built this VCO from MFOS.
The VCO outputs a signal that varies from 0 to about 10 or 12V DC at 28mA. I want to bring this ...
3
votes
3answers
81 views
dynamic gain control for active noise cancellation circuit
I'm an entry- to mid-level electronics hobbyist and I've been tinkering around with a simple active noise cancellation circuit (audio frequencies) based in principle on the schematic here: ...
-4
votes
0answers
59 views
DIY audio interface [closed]
I'm wondering if someone could point me in the direction of a manufacturer or kit to enable me to build a USB or Firewire audio interface. In fact, specifically I just need audio out. It needs to be ...
1
vote
1answer
60 views
Where to find a audio tone dry contact device [closed]
I have an older device that receives an audio tone from a telephone line and coverts that signal to control a 120V AC dry contact relay. The old equipment is no longer working and I have confirmed ...
3
votes
1answer
72 views
Good engineering for Audio Amps
Last weekend and the weekend before, I have been trying very hard to get a good small 8 ohm speaker amp with a preamp for a dynamic mic to work with no luck. It seems like every design I try has ...
0
votes
2answers
67 views
How to choose the right earphone?
Based on my study, I found that there are two different type of positioning the contact for the 3.5mm audio plug, and it is depend on the manufacturer (ex. handphone manufacturer). The difference is ...
3
votes
4answers
164 views
What is the best way to make a speaker louder
What are the pros/cons of adding more coils or getting a stronger magnet for a speaker?
Are there other methods to make them louder keeping the power supplied to the speaker the same?
1
vote
1answer
44 views
phone battery usage at various audio volumes [closed]
I was wondering if anyone knows how the power output of my phone varies with the level I set it at. Lets say I plug my phone up to a stereo to play music and I set my phone volume to 5/10 and then ...
7
votes
3answers
100 views
How to build a timed audio switch?
I want to build a simple device with 2 inputs and 1 output, all TRS 1/8" audio jacks. The device picks one of the inputs to pass through to the output depending on the time of day (at night, it ...
2
votes
3answers
104 views
Why is the output volume lower on a 1 transistor preamp
I built the simple common emitter 1 transistor preamp with a 2n3904 from hackaweek (http://hackaweek.com/hacks/?p=327) and hooked it up to my iPod as a test. When I had the small earbuds on my iPods ...
3
votes
2answers
219 views
How to eliminate Bluetooth noise in electric guitar
I am trying to remove noise from an electric-guitar circuit that I have created called the ArduGuitar. My circuit comprises 2 opto-isolated parts: the audio circuit between the guitar pickups and the ...
1
vote
1answer
119 views
1W Push-Pull Power Amp Design
I need a simple single supply amplifier that draws a lot of current when signal is applied. Without going into why, let's just say this is supposed to be part of a compressor. Distortion performance ...
0
votes
1answer
51 views
Combining audio outputs once amplified
I'm familiar of course with the preferable way to mix audio, that is prior to amplification. However, I have a few mobile radios with roughly 1 watt audio outputs, which I would like to send their ...
1
vote
1answer
65 views
Noise from car amp when grounded to the body [closed]
I am busy installing sound in my car. I have installed an amp and have VCC running to the battery and ground connected to the body of the car. I have noticed that there is noise, seems to be a high ...
