My Clone is dual mono (include PSU) and use single OPA.
I think its a better way
Agreed....looks great...
What's the gain of your amplifier? I can't find a schematic for this circuit.
You can lower the gain if using a HA as a preamp.
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)
Hanky-Panky?
LOL...that's the funniest thing I've read today.
@Wayne, thanks for posting the updated schematic.
hopefully, due to hanky-panky reasons ?
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 !
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.
Last edited:
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Pass Labs
- New PassDIY Headphone Amp (now available)