how can i improve this headphone amp

bluegrass · 29th March 2011, 08:01 AM

I have a Rolls HA43 headphone amp which is simple and cheap. Looking inside, it would seem simple to improve a few components/opamps. Has anyone got any tips on what to swap out? I include a link to the circuit diagram

www.rolls.com/pdf/M_HA43.pdf

...Thanks for any help

bluegrass · 29th March 2011, 01:46 PM

Here is a link to a picture of the actual circuit board

Photo on 2011-03-29 at 15.07 | Flickr - Photo Sharing!

jaycee · 29th March 2011, 02:05 PM

Swap the opamps for NE5532. There isn't really much past that. Better opamps are not worthwhile in this circuit. Maybe swap the 10uF input capacitors for some better capacitors, polyester ones if you can get them.

Fenris · 29th March 2011, 02:50 PM

Ewwww. Variable gain by feedback through a pot? No bypass caps? Not sure much can be done with this circuit.

29th March 2011, 08:01 AM	#1
bluegrass diyAudio Member Join Date: Mar 2011 Location: stockholm	how can i improve this headphone amp I have a Rolls HA43 headphone amp which is simple and cheap. Looking inside, it would seem simple to improve a few components/opamps. Has anyone got any tips on what to swap out? I include a link to the circuit diagram www.rolls.com/pdf/M_HA43.pdf ...Thanks for any help

29th March 2011, 02:50 PM	#4
Fenris diyAudio Member Join Date: Jun 2004 Location: The last frontier	Ewwww. Variable gain by feedback through a pot? No bypass caps? Not sure much can be done with this circuit. __________________ Listen to the music through the stereo, not the stereo through the music.

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29th March 2011, 01:46 PM	#2
bluegrass diyAudio Member Join Date: Mar 2011 Location: stockholm	Here is a link to a picture of the actual circuit board Photo on 2011-03-29 at 15.07 \| Flickr - Photo Sharing!

29th March 2011, 02:05 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Swap the opamps for NE5532. There isn't really much past that. Better opamps are not worthwhile in this circuit. Maybe swap the 10uF input capacitors for some better capacitors, polyester ones if you can get them.

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