Does anyone know where i can get an Mj earmax clone pcb???? - Head-Fi: Covering Headphones, Earphones and Portable Audio

onform · 05-03-2008, 04:23 PM

I want to build this kit and was wondering if anyone had any boards for sale??? or knows where i can get one..ideally with instructions/parts list but not essential.

Anyone else looking to build the clone of this great headphone amp?

Any help would be greatly appreciated..thanks

dBel84 · 05-03-2008, 04:32 PM

You should look at the tweaked version of the circuit = CJ , I have not built it but I would accept that the changes made were an improvement over the original.

I don't know about pcb's, however this amp should be fairly staright forward to build PTP ( assuming you have experience working with high voltages and tubes? ) ..dB

edit ..... just noticed that you already have the earmax pro ! why not build an amp that uses a different topology?

onform · 05-03-2008, 04:37 PM

Quote:

Originally Posted by dBel84

I don't know about pcb's, however this amp should be fairly staright forward to build PTP ( assuming you have experience working with high voltages and tubes? ) ..dB

This will be my first project so i would ideally get hold of a board.

Uncle Erik · 05-03-2008, 05:05 PM

You might want to ask around at Headwize. I think some members there had PCBs made up at one time. There might be some extras still floating around.

Going point-to-point isn't that much more difficult. It's not as easy as stuffing a board, but how hard is it to loop wire/lead through a hole, squeeze it with pliers, then apply solder? It's a little more involved, but you can absolutely do it. Think of all those people who started out years ago building ST-70s and their own radio gear. They did it and so can you.

nikongod · 05-03-2008, 05:17 PM

there was a smallish group buy for the boards a LONG while back. i dunno if any are still unbuilt.

for whatever its worth, when i consider the difficulties with casework to accommodate a rigidly fixed PCB and associated mounting hardware, building PTP may turn out easier overall.

indikator · 05-04-2008, 02:37 PM

a newbie question,

why is it danger working with tubes and high voltage?
isn't it disconnected from wall socket when we build it?

AndrewFischer · 05-04-2008, 03:13 PM

Quote:

Originally Posted by indikator

a newbie question,

why is it danger working with tubes and high voltage?
isn't it disconnected from wall socket when we build it?

It isn't when you are using it.

If you make an error you could have +400V or more on a volume knob, headphone jack or other exposed component.

If it doesn't work, you may need to troubleshoot it with the power on. Also dangerous if you don't know what you are doing or make a mistake.

By dangerous I mean potentially fatal.

tomb · 05-04-2008, 03:19 PM

Quote:

Originally Posted by indikator

a newbie question,

why is it danger working with tubes and high voltage?
isn't it disconnected from wall socket when we build it?

Andrew is correct, but it's dangerous when disconnected, too. That same high voltage is often stored for long periods in the capacitors. If one of those is accidentally discharged, it could be enough to throw you to the floor - or worse.

onform · 05-04-2008, 07:00 PM

Thanks guys.. I am gonna consider p2p then i can have the layout as i want it. and put the ps in a different enclosure.. has anyone had experience with building this amp??

indikator · 05-04-2008, 08:03 PM

gulp...
you guys freak me out already...
how about sitting on bed, I don't get shock by my computer that way

and then, is it true that a balanced amp is two stereo amp?
can we build this amp balanced?
just imagine it,
earmax + HD650 = sinergy
balanced + HD650 = improvement
=> balanced earmax = heaven like.....

vvs_75 said he did build this amp, why not invite him to this thread?