Post pics of your builds.... - Page 397

scooter,

welcome to the end of your wallet scooter, I see you trading in a phoenix for a b22 just like ipod!

Too true... looks like once you get bit by the DIY bug, the b22 is the inevitable end result.

and then there's the dynafet, the kgss, and the blue hawaii, and then there's designing your own gear, and then there's handwinding your own transformers...

I saw a video of a guy making his own tubes.

ladies and gentlemen, I present you my latest build: a dual-mono discrete CMoy.

I followed the original Chu Moy schematic which I found at Headwize, except that I'm using discrete Audio-gd Moon OPAs to drive both channels.
other specs include: Dale RN60 resistors, Elna Cerafine 1000uF 25V rail caps, Wima MKP10 0.22uF input caps, 24ga silver teflon wiring, 1/4" headphone jack, RCA input jacks.

power comes from wallwart only, I'm not planning to power it with batteries, since I'm gonna be strictly using it as a bedside setup anyway.
currently I'm using my laptop's 19.6V 3.42A DC adaptor for testing purposes, LOL


pictures:

Here's my first post on this forum as well as the first photos of my finished Spdif-switch.

The switch has 6 inputs (2 coax & 4 optical) and two outputs (coax/optical).

It can switch any of the six inputs to both outputs individually. Meaning that it can switch input 1 to the coax output, and input 4 to the optical output at the same time.

It has taken influences of off Linuxworks spdif-switch's hardware and has its own software(which is still being "developed").

To control the switch I have a knob and 6 dual color led's (amber/blue). The leds are of the size 0603 and were a royal pain to solder. But the result was very pleasing. I still have some IO-pins to use and might be implementing an IR-receiver to control the switch in the near future.

Cheers! Pictures galore! (And sorry for the pictures quality)

Any idea of the schematic ?

bidoux,

The schematics to the amplifier can be found at Headwize, while the schematics for the OPAs can be found at Audio-gd's website. I beg your apologize for not being able to provide you with links at the moment, I'll get you the links and add them to this post as soon as I have access to my computer (I'm online through my blackberry at the moment).

Basically the amplifier follows exactly Chu Moy's schematic, except that instead of using OPA134s which Chu specified at his schematic, I'm simply using the discrete opamps from Audio-gd. I bought them for about $13 each (directly from Audio-gd), they're single-channel opamps, and I used two of them to drive L and R channels. Just plug and play

I received my front panel from Cam-Expert today and I am very pleased with the quality of their work. The 14.5"x4.5" panel had a fair amount of machining on the front and back of the panel including a cavity around the entire outside perimeter of the panel. All milled edges were clean and the panel was manufactured precisely to my drawing.

Communications was great. I was quoted just 1 week to make the panel. A couple of days after I pulled the trigger I received an email informing me of an unexpected 3 day delay because of material shortage. 1 week following I received shipping notice, right on time.

I hope my experience was not unique and Cam-Expert has corrected the issues others have had.

Looks cool dhaninugraha! How does it sound?

It sounds... Very lively, fun, musical...
It is dynamic, makes you go headbanging and toetapping, but it delivers the sound in a rather smooth manner... It is never lethargic, sterile, nor dull in any way.
It has good low end extension; full, smooth, and slightly laidback mids; treble is detailed but without any stridency.

It even drives HD580s and HD650s effortly. Both sang out loud with the volume knob at 9 o' clock, and at 10 o'clock they sound overly loud.
The HD25-1 was VERY loud at 8 o'clock, and at 9 o'clock it began to distort. Ouch.
(I suspect that the amp's monstrous gain of 11 has something to do with this. )

And it only costed me around $60 to build it

Gain of 11 is way too much for most headphones. Thanks for your answer, I didn't know Audio-gd give their schematic away.

bidoux, here's the link to Audio-gd's page regarding the OPAs:

н¨ÍøÒ³ 1

It's not, I've had nothing but excellent service from them and I believe that they rectified Marshall's situation swiftly and to his satisfaction as well. My latest order from them turned out great.