If you build it cap coupled it would be cheaper still. That said, I don't think it would do well with the T1's as cap coupled... to me the highs were bit troubled with the cap coupled build which wouldn't seem a good match with the hot treble on the T1. Transformer coupled it might do pretty well!
Eddie Current DIY amplifier "Monolith" - Page 10
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Ive solved the PSU problem. It's pretty dumb I connected +out to +in, -out to gnd and gnd to -in.
I wired outputs to 2 XLR/TRS combo jacks and tested with a single end earbuds.
I dont have a balanced output dac so I made my own RCA-XLR cable connecting 1 and 3 to gnd, 2 to pos (my monolith is built with transformer).
In the testing I got little bit music from the L channel on the + phrase, no sound otherwise.
And the right side of the earbuds gets hot pretty fast.
Any hint where should I start debugging?
updates: I swapped earphone out and put two 10ohms 25w load on each channel. Im getting 6v dc on each. And the op near L+ gets hot others are pretty cool.
Edited by mcluxun - 10/8/13 at 10:39pm
I finally started laying things out on the chassis getting ready for the mill... but I managed to try the 800's. Pretty impressive. I have to agree, super wide open, very precise and clean. Definitely not for anyone looking for "warm and syrupy".
Pics as soon as the chassis is done.
Nice knob! The whole deal is looking good. Where's your Eddie Current badge?
Yes, I'm noticing some channel imbalance at the very bottom, but I think it's below volumes I would want to listen at. I also don't seem to ever get full attenuation, there is always a little something bleeding through, even with the pot all the way down.
I am looking forward to having it boxed up, it does better with the HD-800 than I expected!
It was fun. It is pretty straight forward/easy putting the boards together.
Not a lot of options to play with, but plenty of options on casing it up. In fact, it's a great beginners build except that you need to figure out how you want to box it up, but that's not too hard.
I definitely recommend going with the transformers, even though it pushes the build cost up a little, and while you can set it up for singled ended it's best suited for balanced. IMHO anyway.