As a newbie I was wondering how to make a connection for a headphone on the A40 power amp, is there a quick fix?
It doesn't need to be an audiophile solution as long as I can keep listening.
It doesn't need to be an audiophile solution as long as I can keep listening.
Hi,
I built an A-40 and use it every day on speakers of my own and I'm happy with it.
the point is:
1) Do you need 40W per channel on headphones ???
2) Don't forget you will get the noise associated with the PSU requied to feed a 40W class-A amp. In my sense, maybe too much noise to be a good thing.
Why don't try the nice SDS Labs Headphone amp. I drive a pair of 32 Ohms Grados with it. Sounds very good and dead quiet at idle...
I built an A-40 and use it every day on speakers of my own and I'm happy with it.
the point is:
1) Do you need 40W per channel on headphones ???
2) Don't forget you will get the noise associated with the PSU requied to feed a 40W class-A amp. In my sense, maybe too much noise to be a good thing.
Why don't try the nice SDS Labs Headphone amp. I drive a pair of 32 Ohms Grados with it. Sounds very good and dead quiet at idle...
I do want to use it for normal speaker (dynaudio diy) but I also want a headphone connection just to use when my girlfriend is watching telly or something
Same answer,
the A-40 is a power amp and you barely need 1X or 2X line level (ie 2-4V RMS). A well buffered opamp based design should cut mustard like a purpose built mustard cutter for you. If I was you, I may be looking elsewhere that modifing the A-40, at least for the purpose. 🙂
the A-40 is a power amp and you barely need 1X or 2X line level (ie 2-4V RMS). A well buffered opamp based design should cut mustard like a purpose built mustard cutter for you. If I was you, I may be looking elsewhere that modifing the A-40, at least for the purpose. 🙂
Thank you for the complement, it's to bad dynaudio is not into diy anymore.
The SDS amp. looks like a fine and cheap amp, am already ordering the parts, did you make your own print or can you buy one already made.
Ralph
The SDS amp. looks like a fine and cheap amp, am already ordering the parts, did you make your own print or can you buy one already made.
Ralph
Resistors in series with the speaker outputs is all you need. Value depends on your headphone impedance. Try 100 ohms to start if you have low-impedance (32 ohm) cans.
Using a dedicated headphone amplifier may get you better sound, but it is not necessary.
Using a dedicated headphone amplifier may get you better sound, but it is not necessary.
paulb answer seems to be something really acceptable but I wonder if you really get rid of the noise in this case.
For the SDS Labs little amp, I have had the print made for me for this project. Just check if the pcb transformer holes are at the right distance from each other. I remember I've had some problems with that... IRF610 and 9610 could be a better pick from their lower gate capacitance but IRF620 and 9620 are making great music in mine.
Good luck!
For the SDS Labs little amp, I have had the print made for me for this project. Just check if the pcb transformer holes are at the right distance from each other. I remember I've had some problems with that... IRF610 and 9610 could be a better pick from their lower gate capacitance but IRF620 and 9620 are making great music in mine.
Good luck!
- Status
- Not open for further replies.