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opa 627bp in MHZS cd33

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1#
kk_ho 發表於 2007-2-16 15:02:29 | 顯示全部樓層
Windwss,

Respect to GND measurement or rail to rail ?

If respect to GND measurement :
+24 at Pin 8
0
-24 at Pin 4

If rail to rail
+12 at Pin 8
0
-12 at Pin 4

Meaning is dif.
There are many new DIYer beginner here, so please confirm.

KK.Ho
2#
kk_ho 發表於 2007-2-16 23:13:13 | 顯示全部樓層
Windwss,

Ask you one question.

How many TL072 in your application ?

If one IC for both channel, I suggest discrete solution.
Discrete HDAM FET driver, will send the pic to you later.

Un-believeable sound

KK




[quote:af18ab7c35="WINDWSS"]Kk sir,
Thanks for remind me.....

It is rail to rail +12.38 &-12.38, mean total diffrences 24.77V at V+ when refer to V- .

so it is +12.38,0,-12.38-->total 24.77V difference.

Since i put probe at point V+ (pin 8) & point V- (pin 4)

Dear KK sir,

from your experience, which OPA is suit to replace the TL072 in this 8000A.
(i wish to increase slightly clear, natural & stronger but good control of bass, warmer vocal in 8000A)
In my mind got 3 choice --> 1) AD 8066 (since it's bass better than opa2132/34   2)OPA 2132/34  3) AD 8620 (i worry this too agresive)

i know most people will suggest opa627 : ) but this it is expensive in malaysia at least 2x-3x the price as the item 1,2,3 above. And main issue is taht i don't know how to build the circuit to pair up the opa627 with coupling cap : (


ahrader,
had check, octave sell AD8066 at rm85 (include the panel, BG cap), farnell sell TI opa2132 (dip) at ~rm25.
TL071 is single channel, u may just get a opa 627 (dip) ....since it can support +/-15v (typ)-->total=30v[/quote]
3#
kk_ho 發表於 2007-2-21 10:12:18 | 顯示全部樓層
Windwss,

HDAM circuit here:

Red circle area is MUTE, you are no need to do that part.

Wish you complete it soon.

Any problem, please let me know, I have PCB !!!

KK.Ho @ HK

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4#
kk_ho 發表於 2007-2-21 10:18:40 | 顯示全部樓層
WindWSS,

One more, Marantz PM17 amplifier with HDAM buffer

KK

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5#
kk_ho 發表於 2007-5-4 18:14:29 | 顯示全部樓層
WINDWSS, newfan,

Remember check your MHZ-33/66 have no bug (waveform distortion) before starting your mod.

KK.Ho
6#
kk_ho 發表於 2007-5-31 16:37:43 | 顯示全部樓層
How about HA5112 from Harris ?
7#
kk_ho 發表於 2007-6-19 02:05:48 | 顯示全部樓層
107574 people viewing this post

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8#
kk_ho 發表於 2007-6-19 02:07:39 | 顯示全部樓層
When I back to work in hififever after Oct.

I think the first teaching class is

CD modification for MHZ 33,66

Any comment ?
9#
kk_ho 發表於 2007-6-22 00:40:01 | 顯示全部樓層
Inspect your CD player.........

They are Hi-Fi Lo
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