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Old 19th March 2007, 12:00 AM   #21
Ciu is offline Ciu  France
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Default X10D Mods

Hello Tube_Dude !

Not shure to have understood :
For a gain of 6, the resistor change from 1.5k to 22k : OK
So the ratio for resistors is 15 (not 5)

Now for the // cap : change the original 220pF (on attached scheme) for a smaller one with a ratio of 15 ? No ?
220 pf / 15 = 15pF

So sorry for my ignorance !
R.C.
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Old 22nd March 2007, 08:08 PM   #22
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Default Re: X10D Mods

Quote:
Originally posted by Ciu
Hello Tube_Dude !

Not shure to have understood :
For a gain of 6, the resistor change from 1.5k to 22k : OK
So the ratio for resistors is 15 (not 5)

Hi Ciu

Sorry for the delay I have been to busy...


The gain is given by the formula I give in my previous post.

Imagine (all the people..... ) that you change the 1k5 resistor for a 1 Ohm resistor , we have:

1+ (1/ 4k7 ) that give

1+ (0,0002 ) or a gain of ~ 1

Now if you change the 1k5 for a 4k7

we have

1+(4k7/4k7 ) that give a gain of 1 +(1)= 2

Remark, that we have passed from a feedback rsistor value of 1 to 4.700 (4.700 times greater ) and the gain of the stage only have become the double .

Then for a gain of 6 the value of 22 k is absolutely correct.

I hope to be clear now...


Regards


PS: In your last schematic the 4k7 resistor become 8k2 , so for a gain of 6 the 1k5 resistor must become ~41k or a more normal value of 39 K
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Old 23rd March 2007, 10:20 PM   #23
Ciu is offline Ciu  France
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Default X10D Mods

Hello Tube_Dude


For a gain of 6 you must change the 1.5 K resistor for 22 k. As the resistor is 5 times greater , the // capacitor must be ~ 5 times smaller for the same time constant

That was the beginning of my trouble ! 22k /1.5k = 5 ?

In my study case, for a gain of 6, the resistor changes from 1.5k to 39 k, OK !

And the value of the cap, how to calculate, where do you find the ratio ? Any recommanded technology for the cap ? Voltage (>= 30v ?)

Many thanks for your patience !
R.C.
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Old 1st April 2007, 05:44 AM   #24
arvin is offline arvin  United Kingdom
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Does anyone have schematic for versions 2 & 3 please?

In the schematic for version 1, what are the transistors used in the psu section?

cheers.
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Old 26th November 2007, 08:45 AM   #25
dzkh63 is offline dzkh63  Hong Kong
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Dear Tube_Dude
The Musical Fidelity X-10D I can't find a 4.7k resistor.I want to learn how to adjust the gain,can you tell more detale.Thank You
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Old 26th November 2007, 09:04 AM   #26
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Quote:
Originally posted by dzkh63
Dear Tube_Dude
The Musical Fidelity X-10D I can't find a 4.7k resistor.I want to learn how to adjust the gain,can you tell more detale.Thank You

Is your schematic , the one in post # 21 ?
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Old 26th November 2007, 11:52 AM   #27
dzkh63 is offline dzkh63  Hong Kong
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Dear Tube_Dude
Yes,it's post#21
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Old 26th November 2007, 10:57 PM   #28
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Quote:
Originally posted by dzkh63
Dear Tube_Dude
Yes,it's post#21
Hi ,

The overall gain is given by:

1 + ( R106 / R 104 )

in the case of post #21 we have

1 + ( 1,5K / 8,2k ) = 1. 18

For a overall gain of 2 you can use R106 , 8,2 K

For a gain of 3 use R106 , 16,4 K .........................

Greetings
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Old 27th November 2007, 11:49 AM   #29
dzkh63 is offline dzkh63  Hong Kong
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Thank You ! Tube_Dude
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Old 5th January 2008, 04:10 PM   #30
niksh is offline niksh  Malaysia
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Default XD10

Hi RC,

I have a clone XD10. I am interested to know the ouutcome of your mods if you dont mine sharing. I have change all the supply cap with panasonic FC 2200uF/35V, change the diode with ultra fast soft recovery and bypass the diode with 0.1uF caps. All the transistors in the power supply removed/bypass. I also upgraded all the caps in the circuit. Did u manage to inxrease the gain?
Thanks
NikS
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