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Old 5th August 2005, 04:31 AM   #1
thanh is offline thanh  Viet Nam
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Default Carlos! This is my amp

My amp still has a problem which need to be solve . If volume is set at high level and then I turn on the pre-amp , DC protection circuit will operate .
Perhaps overload-protection-circuit operated after I had turned on pre-amp .Then offset voltage got high and enough to activate DC-protection-circuit .
I had to buy new power transistors for many times before .
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Old 5th August 2005, 08:45 AM   #2
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Default Thanh, this new picture...hummmm, the avatar....oh!..oh!...oh!... what a pretty lady!

Well thanh...old friends we are, can you send me some pictures of that lady..the one in the avatar.... a hell pretty lady!.....if not your wife, of course!

nanabrother@yahoo.com

Thank you very much Thanh, very king to show me your schematic, and those problems with switch on or even switch of, can be solved with big caps to delay the voltage rise into the differential emitters.... resistor and electrolitic may delay enougth.

Maybe if you create some loss in Vas voltage, installing some rail resistors followed by condensers may help.

Did you not apreciate the charge suckout condenser in parallel with your 100 to 330 ohms (tone adjustment and output bias adjustment float resistor)... sometimes it help a lot... try 100N or 220N there...just as a research.

Very good schematic, fully simetrical, remember Leach amplifier, but better in my idea.

As you are using a simulator Thanh, inform us some technical specifications, despite this is not the guarantee of good sonics, have some interesting informs to many data guys.

To me, please, tell me how is the sound.

regards,

Carlos
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Old 5th August 2005, 08:50 AM   #3
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Default Your amplifier is great, but, she is really....

L-o-v-e-l-l-y

Carlos
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Old 5th August 2005, 09:41 AM   #4
SkyChu is offline SkyChu  Taiwan
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Are C3 & C7 NP cap ? If not, Maybe C3 & C7 can connect like attached picture.
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Old 5th August 2005, 10:05 AM   #5
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Carlos, you are old tom - cat . Let beauty sleep, rather make amps .
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Old 5th August 2005, 02:33 PM   #6
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Default Yeah Epupa, near to be a grandfather, better to make amplifiers

I can be better doing that.

hehe.

You are rigth.

regards Epupa
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Old 6th August 2005, 04:02 AM   #7
thanh is offline thanh  Viet Nam
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Quote:
can be solved with big caps to delay the voltage rise into the differential emitters.... resistor and electrolitic may delay enougth.
Oh ! i can't understand .! I don't uses differential emitter resistor .
Quote:
Did you not apreciate the charge suckout condenser in parallel with your 100 to 330 ohms (tone adjustment and output bias adjustment float resistor)... sometimes it help a lot... try 100N or 220N there...just as a research.
I actually don't understand because my dictionary can't work .
Adding a capacitor in parallel with 100//330ohms can't solve the problem .
Quote:
To me, please, tell me how is the sound
I told you about its sound in Mikeb's thread "explendid .... "
Its sound soft . I think that all stage can be improved more so i improved current source . The output impedence of current source will determine CMRR
i think
clean = low noise
low noise = low noise transistors , caps , resistors and CMRR


Quote:
Are C3 & C7 NP cap ? If not, Maybe C3 & C7 can connect like attached picture
Hi Sky Chu !No , they are polarity cap . If C3&C7 are connected in series with each other , " component L " will increase .So i connect like that to decrease "component L" and to increase "component C "
If you have good cap , you dont need do like me



oh ! guys ! my amp has a incomportable to use but i still work and never has any failure
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Old 6th August 2005, 10:45 AM   #8
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Default My suggestion thanh, is to hold one 220N capacitor between your fingers, and play

Music very loud, having metal instruments playing.

Now discharge the 220N capacitor, producing a short circuit with its leads over some metal.

Now, playing music, with your fingers holding the capacitor, touch the 100 to 330 ohms resistor extremes...tell me if you could perceive some difference.

Try to observe the effects in voices and bass too.

Good luck!

regards,

Carlos
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Old 8th August 2005, 05:48 AM   #9
thanh is offline thanh  Viet Nam
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Oh ! thanks Carlos !
I will try to do your comments !
Big problem is that my amp is easy to overload and that capacitor can't solve this problem .
My amp is not similar to Leach amp . It is similar to John Curl 's amp .Why ? because I was born too late
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Old 8th August 2005, 07:34 AM   #10
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Thanh,

You need to have preamp always on. This is regime for audio if you do not have relay delay for settling, or you will have LF pulses go through already on amplifier which will trigger sensitive protection circuits.

Just like horny man will respond ! Way it is, perfectly natural!

Cheers,
Greg
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