stereo hearphone amp project

[blanik]

hi all, my friend (a drummer) asked me to make him a small stompbox sized stereo amp for his earphones, he's hooked to a metronome but complains that he almost loose the click during some songs... it's at the limit of comfort for him... so he just want to have a little more room to play with... it has to work on a 9V battery and not eat up too much power...

i was thinkig about the stereo mirco amp from Senior Pena at Tonepad... it's based on the MXR+ but in stereo
would this be loud enough to drive earphones?
(and what is the multiplicative of this amp? i.e.: 2X the input, 3X, 10X?)

http://www.tonepad.com/getFile.asp?id=51

R.
PS on the tonepad project there's 2 pots, is there a way to hook this on one pot and keep it stereo or i have to use a dual pot?

PPS if you have other suggestions for a simple, stereo mini amp circuit that work a long time on a 9V please feel free...!

[Noplasticrobots]

This is the first project that comes to mind:

http://www.fixup.net/tips/pktamp/original.htm

This one uses two 9v:

http://tangentsoft.net/audio/cmoy-tutorial/assy.html

[blanik]

the CMoy is interesting, but i guess the microamp will do a similar job on only one opamp... i also figured that i could leave out the two pots at the outputs and just put a regular pot at the input (prolly a switching pot to include power) so the thing would only have one pot and nothing else (not even a LED since it won't be bypassed anyway...)

it's mention that the CMoy has a gain of 11 (is it 11 times the inpust signal?) if so that would be enough i guess...
the stereo microamp works on a single 4558, what gain would that have?

R.

[Gilles C]

I built one with a 5532 that works well for me, but he may need one based on a LM386 for more power.

http://seanm.ca/stomp/headphone.html

http://www.minidisc.org/headbanger.html

http://www.headphoneamp.co.kr/bbs/zboard.php?id=diy_sijosae&no=225

http://www.paia.com/headbuff.htm

Gilles

[blanik]

this is what i was wondering... does the 4558 or similar opamp gives out enough power? (the signal coming might be a little aplified too...)

R.

[MetalUpYerEye]

My friend plays his bass through a modified Ruby I built for him. He plugs those crappy "stock" Sony headphones that you get with a discman into it and it sounds great.

[Laus]

Do the Ruby from ROG and GGG for the Zobel network. Could use another buffer instead of the FET but that´s your own choice.

[TheBigMan]

Variation on the Microamp theme.  Bear in mind that I haven't verified this layout though.   

[blanik]

wow, i've never seen those vero layouts BigMan... very interesting stuff there  !

the little gem
the EZ buit headphone amp (the LM386 is often mentionned in this kind of application)
and the Microamp look all very interesting!!!!

now i can't choose... 

are the ll gem and the EZ tested?

R.

[vortex]

I just built a headphone amp this weekend!

I needed something to drive in ear monitors and decided to try this Headbanger project.

http://www.minidisc.org/headbanger.html

The Headbanger runs on  9V and is based on the LM386 chip.

I only needed mono in and stereo out so I only built one half of the headbanger amp. I must say that it sounds very good and is frightneningly powerful.

[lumpymusic]

I just built a headphone amp this weekend!

I needed something to drive in ear monitors and decided to try this Headbanger project.

http://www.minidisc.org/headbanger.html

The Headbanger runs on  9V and is based on the LM386 chip.

I only needed mono in and stereo out so I only built one half of the headbanger amp.
I must say that it sounds very good and is frightneningly powerful.

What kind of signal are you driving it with? Line level? Speaker level?

Lumpy

[Mark Hammer]

Don't raise the bridge.  Lower the river.

Try this out as a way of achieving audible metronome tone without resorting to overdriving your eardrums with your drums.

http://www.headwize.com/projects/noise_prj.htm

[vortex]

Quote from: vortex on Today at 02:08:20 AM
I just built a headphone amp this weekend!

I needed something to drive in ear monitors and decided to try this Headbanger project.

http://www.minidisc.org/headbanger.html

The Headbanger runs on  9V and is based on the LM386 chip.

I only needed mono in and stereo out so I only built one half of the headbanger amp.
I must say that it sounds very good and is frightneningly powerful.


What kind of signal are you driving it with? Line level? Speaker level?

Lumpy

Hi Lumpy, the headphone amp is being driven by a line level signal.

[TheBigMan]

wow, i've never seen those vero layouts BigMan... very interesting stuff there  !

the little gem
the EZ buit headphone amp (the LM386 is often mentionned in this kind of application)
and the Microamp look all very interesting!!!!

now i can't choose... 

are the ll gem and the EZ tested?

R.

Lil Gem is, the EZ isn't but if I got that one wrong I'll give up now!