Post pics of your builds.... - Page 18 - Head-Fi: Covering Headphones, Earphones and Portable Audio

Toody · 12-23-2004, 06:32 PM

from the begining i planed for a crossfeed filter, volyme pot, output buffer...

But when i didn't find any cases with the right size i just stayed with the basics. I could not even fitt a led telling if the power is on in that case.

I am happy with the sound but there is some white nosie when using high sensetivity headphones. I dont know if is becouse the input offset currents are not properly balanced but is something to work on for the next version.

Next version will probably not be portable and will include all the gadjets i could not fitt in this tiny case.

setmenu · 12-31-2004, 05:35 PM

Here are some pics of my latest creations, two made for presents and one
for myself.

They are basically three channel amps based on the pimeta schematic.
Opamps are Ad8620 and 8610, the buffers EL2001.
All amps are biased into class A with cascodes.
The batt monitor shows 5 levels and is switch operated.
The battery packs are 8x 300mah 2/3 aaa nimh cells.
The amps quiescent current draw is a about 14.5 ma.
the power indicator led fitted to the amp module is a
Luxeon item and is very efficient producing a high levels
of illumination at .5ma, the colour is cyan, very nice

Additional features are the inclusion of jumper positions in
the feedback network to add bass boost modules and
further jumper positions on the buffer outputs to adjust
source impedance.

Setmenu

ble0t · 12-31-2004, 06:59 PM

Wow :lambda:

That is some very nice work as well as some skilled soldering!

Tim · 12-31-2004, 10:23 PM

Here are some pictures of a meta42 that I built about two years ago.

The enclosure is a tin that Fossil watches come in. This is the second tin I used. I drilled the holes all wrong on the first one.

pne · 01-02-2005, 05:29 AM

here is a cmoy i just finished over the holiday break. My first amp build, definately wont be my last. :allteeth:

strogg · 01-04-2005, 06:55 AM

the K-12M from S5 electronics in a custom aluminum enclosure painted... an odd color and then clearcoated. even though the electronics part took me just one day to complete, the case and some tweaks/improvements took the whole holiday break!!!

the amp drives my akg's like a dream. it put enough bass in those things to make me completely satisfied with both the quality and the volume of bass! unbelievable, no?

the power recepticle is a 5 amp EMI filter i picked up at hsc, which goes to shielded (thanks aerius) transformers to a cheaply tweaked out board in triode mode, then out again on the cheapest rat shack jack i can find (yeah... i'm cheap) with a pair of 5 ohm wirewound resistors to sort of match the impedence. all of this is switched on and off by a heavy duty 15 amp switch (just so it can make a loud clicky sound

)