$5 cheap headphone amp / stereo buffer board

raidfibre · 5th November 2007, 01:49 AM

About 2 years ago I told my brother in law (who is not an engineer) that I'd help him build a headphone amplifier.
Well, we all know how helping relatives goes. It's usually all talk. And it was, until I decided that I really ought to get something done so he doesn't dislike me over a headphone amp. I drew some boards in Eagle and had them made. The board is very simple, I'm sure anyone could solder it. If I was making it for myself I would have made it half the size and used all SMT components but it's a lot cheaper this way. It's a single sided through-hole wide-track board with two jumpers. It honestly doesn't get much simpler than this board.

Boards are $5 each and $3 shipping for however many boards you want via USPS inside the USA. If there is considerable interest (commitment) I can put together part kits. I have 18 boards to sell. Please PM me if interested, and please ask if you have questions.
If you want more than a couple boards we can work out a price.

Tube_Dude · 5th November 2007, 03:05 AM

Hi

The Op-Amp in the schematic is wrong.

You must connect the inverting input to the junction point of R8 and R7 , and vice versa ...

raidfibre · 5th November 2007, 11:01 AM

how in the hell did I do that?!

well it looks as though I've made a comparator board. crap.

Nordic · 5th November 2007, 11:33 AM

lol, next time, build a prototype first.

raidfibre · 5th November 2007, 12:12 PM

Well it's through hole so you can just swap the leads going to pins 2 and 3. I'll sell them for $2 a piece.

jaste · 13th November 2007, 01:19 PM

Hi, what would the shipping be for Sweden? And are you intrested in sending a board overseas?

raidfibre · 13th November 2007, 01:39 PM

The shipping would presumably be no more expensive than inside the USA. The boards are small and light.

jaste · 15th November 2007, 06:49 PM

What are the dimensions of the board?

raidfibre · 19th November 2007, 05:25 PM

It is less than 4cm x 2cm. I will get the exact dimensions when I go home later today.

5th November 2007, 01:49 AM	#1
raidfibre diyAudio Member Join Date: Jan 2003 Location: Boston, MA, USA	$5 cheap headphone amp / stereo buffer board About 2 years ago I told my brother in law (who is not an engineer) that I'd help him build a headphone amplifier. Well, we all know how helping relatives goes. It's usually all talk. And it was, until I decided that I really ought to get something done so he doesn't dislike me over a headphone amp. I drew some boards in Eagle and had them made. The board is very simple, I'm sure anyone could solder it. If I was making it for myself I would have made it half the size and used all SMT components but it's a lot cheaper this way. It's a single sided through-hole wide-track board with two jumpers. It honestly doesn't get much simpler than this board. Boards are $5 each and $3 shipping for however many boards you want via USPS inside the USA. If there is considerable interest (commitment) I can put together part kits. I have 18 boards to sell. Please PM me if interested, and please ask if you have questions. If you want more than a couple boards we can work out a price.

5th November 2007, 03:05 AM	#2
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Hi The Op-Amp in the schematic is wrong. You must connect the inverting input to the junction point of R8 and R7 , and vice versa ... __________________ Jorge

5th November 2007, 11:01 AM	#3
raidfibre diyAudio Member Join Date: Jan 2003 Location: Boston, MA, USA	how in the hell did I do that?! well it looks as though I've made a comparator board. crap. __________________ -- Martin K

5th November 2007, 12:12 PM	#5
raidfibre diyAudio Member Join Date: Jan 2003 Location: Boston, MA, USA	$2 boards now... Well it's through hole so you can just swap the leads going to pins 2 and 3. I'll sell them for $2 a piece. __________________ -- Martin K

13th November 2007, 01:39 PM	#7
raidfibre diyAudio Member Join Date: Jan 2003 Location: Boston, MA, USA	The shipping would presumably be no more expensive than inside the USA. The boards are small and light. __________________ -- Martin K


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5th November 2007, 11:33 AM	#4
Nordic diyAudio Member Join Date: Sep 2005	lol, next time, build a prototype first.

13th November 2007, 01:19 PM	#6
jaste diyAudio Member Join Date: Dec 2005 Location: Stockholm	Hi, what would the shipping be for Sweden? And are you intrested in sending a board overseas?

15th November 2007, 06:49 PM	#8
jaste diyAudio Member Join Date: Dec 2005 Location: Stockholm	What are the dimensions of the board?

19th November 2007, 05:25 PM	#9
raidfibre diyAudio Member Join Date: Jan 2003 Location: Boston, MA, USA	It is less than 4cm x 2cm. I will get the exact dimensions when I go home later today. __________________ -- Martin K

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