Headbanger headphone amp

[pejinm]

Hi guys,

I build this headphone amp with 4 stereo channels oredered by my friends (musicians),
they will use it like some kind of in ear monitor on rehearsals. Anyway here are some pics...
What do you think?

Cheers

 

[pejinm]

2

 

[pejinm]

If anyone interested I will post PCB and schematic...

 

[karahara]

Hi. Nice work, useful thing for musicians.
I'd like to see the pcb&schematic, maybe I built one for my band too.

 

[pejinm]

PCB...

The amp is based on NationalSemiconductor LM386N op amp which can work with 6-12V supply.
The PCB layout for 4 stereo chanels attached...

Regards.

 

[pejinm]

...and tracks...

I hope you can use this resolution because I can't post larger pic.
Cheers

 

[karahara]

Allright, thank you.
Thougt of that 386, perfect for such a "Low-Fi" environment.

 

[pejinm]

You welcome,

Please post the pictures of your work when you finished, I would like to see it...

Good Luck

 

[EWorkshop1708]

Awesome little amp.

That's a LOT of 386 chips, hehe.

They work great for small speakers, and real good for headphones.

I made a super listening mic amp and used a 386 on the output, and it's real loud.

I noticed you used large 10uf input caps and 470uf output caps. Very nice.

Also, the box looks real clean.

And by what I see, is the volume is determined by the input source?

 

[pejinm]

Hi EWorkshop1708,

Glad you like it!
Yes there is no pots because most of quality headphones have volume control on them (and I have't got much space left in case he,he...)

Regards

 

[EWorkshop1708]

Hi EWorkshop1708,

Glad you like it!
Yes there is no pots because most of quality headphones have volume control on them (and I have't got much space left in case he,he...)

Regards

What gain are the chips set to since no volume control is used??

 

[pejinm]

Gain

The gain is set by 18k resistor and it's about 20dB...
I'm thinking to put one pot on input just in case if signal gets too high.

Chiao