I have no idea of the gain of this HA but its driving a pair of F5t monos which are 15db of gain. I have no issues with gain (normal listening, the vol knob is at 12:00 o'clock)
The schematic is in an earlier post (with some notes)
After a day or two with the OPA627 (I thought it was good but a little foreword in the mids) then swapped it out for the LM4562 ....along with a pair of Quricap XO's. Now all is as it should be,, great soundstage, clarity and imaging.
Happy bunny...
Happy bunny...
Just some sort of flu or cold nothing fun. I try to follow orders she is a nurse after all I don't argue medicine with her she is always right.
Hanky-Panky?
LOL...that's the funniest thing I've read today.
@Wayne, thanks for posting the updated schematic.
LOL...that's the funniest thing I've read today.
@Wayne, thanks for posting the updated schematic.
Amp up and working, about 16mV dc-offset on both channels.
Amp power is crazy high into my he400s, pot around 10 clock is already high volume. I am using Auricap xo capacitors as suggested from a member and NE5532AP opamp. The sound quality is excellent.
Got my case from modushop, now the final touch and a panels.
Amp power is crazy high into my he400s, pot around 10 clock is already high volume. I am using Auricap xo capacitors as suggested from a member and NE5532AP opamp. The sound quality is excellent.
Got my case from modushop, now the final touch and a panels.
Another Member that discovers that not reading the Forum article on system gain results in a vol pot with a very restricted useful range.
Headphone amps do not need much, if any gain. sensitivities like 90dB/mW to 110dB/mW tell you that !
Headphone amps do not need much, if any gain. sensitivities like 90dB/mW to 110dB/mW tell you that !
Guilty as charged.... Where is the article 😀?
This one?
http://www.diyaudio.com/forums/diyaudio-com-articles/186018-what-gain-structure.html
Yes, that article.
It does not specifically deal with headphones, but the philosophy can be directly applied.
The absolute maximum input voltage to many headphones is 5vac or 5Vpk.
But with most that level will almost blow your eardrums.
Expect maxima during loud reproduction to be <1Vac and average levels <50mVac
Try measuring the average levels of music/audio after setting your vol pot to a comfortable listening level.
Now try a low listening level and measure averages.
Now try a short period of high levels that you probably should not use for long nor often and measure the average level.
You can now use those typical levels for your headphones in that article to assess your required gain.
It does not specifically deal with headphones, but the philosophy can be directly applied.
The absolute maximum input voltage to many headphones is 5vac or 5Vpk.
But with most that level will almost blow your eardrums.
Expect maxima during loud reproduction to be <1Vac and average levels <50mVac
Try measuring the average levels of music/audio after setting your vol pot to a comfortable listening level.
Now try a low listening level and measure averages.
Now try a short period of high levels that you probably should not use for long nor often and measure the average level.
You can now use those typical levels for your headphones in that article to assess your required gain.
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