Search found 6 matches

by brodave38
Fri Nov 21, 2008 1:53 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

[quote="CeaSaR"]brodave38, I remembered that most consumer gear has an Aux Input rated at 300 mV. So, shoot for the magic number (600 mV total, +300 to -300). I'm not sure about the input impedance. 10k? 50k? 100k? It has been a long time since I've read component specs, and most don't come with the...
by brodave38
Fri Nov 21, 2008 1:26 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

Revised Schematic

To Bigglez:
Please provide a revised schematic for adjustable gain preamp.
Thanx a whole bunch!
BroDave38
by brodave38
Wed Nov 19, 2008 5:13 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

Thanx to you all for the GREAT info! I will build the device you showed me, Bigglez , with 10K pots (audio taper?) as suggested by CeaSaR , because one thing I am concerned about is over-driving any device I plug the unit into! I have the Radio Shack Phono preamp referred to by frhrwa and I was conc...
by brodave38
Mon Nov 17, 2008 5:37 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

Thanx for the info, Bigglez! If you would be so kind as to show me a schematic, I would"roll my own"! The kit you showed me appears to have an 8 ohm output. What I think I'm looking for is a device that has a linear gain of 10, matched to a standard(?) earphone input of about (50?)mV with an output ...
by brodave38
Mon Nov 17, 2008 2:31 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

Stereo Headphone Output Levels

Thanx for the fast reply, Externet! Please bear with me, but The output device is a cell phone with no gain controls. I believe that the outputs are 50 mV and aren't Line Level Inputs 500 mV minimum? And isn't the characteristic impedance of earphone outputs a complete mismatch with Line Level imped...
by brodave38
Mon Nov 17, 2008 2:03 pm
Forum: General Discussion
Topic: How to amplify Stereo Headphone Outputs
Replies: 31
Views: 9481

How to amplify Stereo Headphone Outputs

Is there a low-cost way to amplify stereo headphone outputs (50mV?) to
Line Level Inputs (500mV?) with a portable device powered by 3-14V DC?
It doesn't need to have gain controls, but should be a good impedance match. Thanx,
Bro. Dave38