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CMoy with Jung multiloop & output buffer? - Page 2

post #16 of 24
1/6/10 at 2:31am
use only one TLE, otherwise you risk the TLEs fighting each other to get dominance of the ground.

There's no direct benefit of using two TLEs for two channels.

Next, the LMH can go up to 300mA, you'll want to have a better ground buffer that can do much better.

For your ground configuration, it's better to put big caps from rail to ground instead of rail to rail.
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post #17 of 24
1/6/10 at 3:33am
Thread Starter 
okay, so it would be better to use just 1 TLE to power both channels...

but I thought tangent said at his site (specifically on the virtual ground article) to use just 1 cap before the TLE, rail-to-rail?

what about adding a couple caps after the TLE, from each rail to ground, but still keeping the rail-to-rail cap before the TLE? would it work?
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post #18 of 24
1/6/10 at 5:04am
Quote:
Originally Posted by dhaninugraha View Post
I thought tangent said at his site (specifically on the virtual ground article) to use just 1 cap before the TLE, rail-to-rail?
Tangent was more equivocal than that. Plus, we did just see, above, that Tangent doesn't know everything.

Whether to place the caps in front of the TLE or after it depends on the circuit. In your case, I'm thinking TzeYang is right, because you only have two channels. This means your TLE is there all alone trying to manage virtual ground; it could use a little help from output caps.

What you have so far is pretty much a MINT. Even with the help of big caps from rail to vground, it was still possible to make the amp sound bad at high volumes, most probably because of an inability to sink ground currents properly. Without the output caps...? Probably really bad. I don't particularly want to dig up a MINT and hack it to see, but you're welcome to try the experiment

Compare the full PIMETA v2, where we have a nice and strong third channel to manage vground, so the big caps can go rail-to-rail.
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post #19 of 24
1/6/10 at 7:26am
Quote:
Originally Posted by dhaninugraha View Post
okay, so it would be better to use just 1 TLE to power both channels...

but I thought tangent said at his site (specifically on the virtual ground article) to use just 1 cap before the TLE, rail-to-rail?

what about adding a couple caps after the TLE, from each rail to ground, but still keeping the rail-to-rail cap before the TLE? would it work?
which is why most of us has been telling you to build the pimeta v2 instead of reinventing the wheel.

If you feel lazy, and do not need the Class A bias, you can omit the circuit. In fact you give yourself some voltage head room too.
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post #20 of 24
1/7/10 at 6:25am
Thread Starter 
allright then, many thanks for the enlightment, guys

it's just that... there's this sort of "DIY complex" I'm suffering, which itches me to improve anything I got on hand... but I guess when I've gone this far, this would be "hacking" rather than "improving", yes?
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post #21 of 24
1/7/10 at 11:01am
Quote:
Originally Posted by dhaninugraha View Post
allright then, many thanks for the enlightment, guys

it's just that... there's this sort of "DIY complex" I'm suffering, which itches me to improve anything I got on hand... but I guess when I've gone this far, this would be "hacking" rather than "improving", yes?
check that out: http://www.head-fi.org/forums/f6/gre...6/#post6291997

"Hacking" can mean improving too !
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post #22 of 24
1/9/10 at 1:40pm


I upgraded my amplifier with BD139 transistor buffers. I cannot hear those, it is pretty odd that piece of silicon doesn't have a sound signature !?
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post #23 of 24
1/9/10 at 2:18pm
Quote:
Originally Posted by dhaninugraha View Post
allright then, many thanks for the enlightment, guys

it's just that... there's this sort of "DIY complex" I'm suffering, which itches me to improve anything I got on hand... but I guess when I've gone this far, this would be "hacking" rather than "improving", yes?
My friend, have you replaced all the capacitors in your CMOY to Blackgate Fs and all the resistors to ultra-high precision mill-spec diamond-coated carbon ones?
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post #24 of 24
9/12/11 at 11:16pm

ultra-high precision mill-spec diamond-coated carbon  ???

where r u buy this resistor?

would u give me some more info about this resistor?

is it same as Texas TX2575 "nude resistor"?

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