OMG so close! But I need your approval!
Mar 2, 2006 at 6:28 AM Thread Starter Post #1 of 8

tilt

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Supra Wrote:
"it's quite easy- I just cut the link to pin 3 of the opamp. There's some spare holes to connect a pair of 220uF Bi Polar Blackgates in Super E style from the output of the DAc (after the 270 ohm I/V resistor) direct to the output socket. Disconnect the wires from the opamp to the output socket, put a 100K resistor across output socket"

what does "super E style" mean? Anyway

like it said, just cut the lead to pin 3, then run a wire from the end of r35 with the 220uf cap to the output? with a 100k resistor.

My grasp of what he said:
bypass.JPG

I think i forgot the 100k

Schematic
http://www.fadeout.ca/images/Dac/dacs.jpg

Pic of the inside of the dac: *Large*
http://www.fadeout.ca/images/Dac/dac3%20Large.jpg
 
Mar 2, 2006 at 6:50 AM Post #2 of 8

tilt

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r35 and r36 are the I/V
 
Mar 2, 2006 at 6:57 AM Post #3 of 8

tilt

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like this?

this.GIF
 
Mar 2, 2006 at 9:16 PM Post #5 of 8

tilt

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?
so the long leg would be goiong to the rca jack on the red, and the short leg on the blue would be going the other rca jack?

I thought non-polar caps had the same length legs ?

Left:
_____
220uf|---- <--Wire
_____|-------- <--rca

Right:
_____
220uf |------- <--Wire
_____|---- <Rca

Ugh, please forgive my ignorance
frown.gif
 
Mar 2, 2006 at 9:48 PM Post #6 of 8

MisterX

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http://www.percyaudio.com/Catalog.pdf

From page 7:
Quote:

Additional performance can be obtained from the N/NX/NH
non-polar types by configuring them as an “L Canceling Pair”.
This involves paralleling two identical capacitors so that the
starting foil lead of one is connected to the ending foil lead of the other and vice versa. This arrangment lowers the ESR, cancels
the internal inductance, and eliminates resonance, allowing
the Black Gates to function as pure C into the GHZ range.
This combination is the “Super E-Cap”.


Translation:
Parallel two N series caps with the polarity's reversed and get Super E.
wink.gif

(each cap should be half the value of the cap you are replacing)
 
Mar 2, 2006 at 10:06 PM Post #7 of 8

tilt

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Like one of these?
123.GIF



bg4533 wrote:
"I found the best mod to be to bypass the output stage. No output stage is used in many TDA1543 amps. To bypass the output stage I disconnected the RCAs from the output, hooked a Blackgate NX and resistor to the RCAs, and ran a wire from a hole at the output of the TDA1543s to the Blackgates. The mod is very easy and only cost a few dollars."

In a follow up
dsavitsk wrote:
"Do as BG suggests and take the output right from the TDA1543. (You will be using a passive I/V. The TDA1543 is unique in being able to pass a usable level signal with just a resistor based passive I/V. To many of us, the sound is very improved by doing this.) To do this, you will need 5 resistors and 2 capacitors. The setup looks like this
IV.jpg


It looks like there is no bias in this situation, just two outs.
 
Mar 2, 2006 at 11:43 PM Post #8 of 8

tilt

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Hurray! BG4533 Pm'ed me with what to do.

Thank you everyone for you help! Guzzler, Mr. X and of course bg4533!
biggrin.gif
 

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