Sanken for SR200
And this is 3 pairs Sankens that I want to use
they look great
kang Naf do you know what the meter says...
B=beta Uf=...?
No... I will make ordinary but hand made EI trafo spesial for it, no SMPS for now.@Bli John... i know what you prepare for supply
And this is 3 pairs Sankens that I want to use
they look greatkang Naf do you know what the meter says...
B=beta Uf=...?
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Witch value R11 is on your circuit?No... I will make ordinary but hand made EI trafo spesial for it, no SMPS for now.
And this is 3 pairs Sankens that I want to use
kang Naf do you know what the meter says...
B=beta Uf=...?
Hi my friend, you got PM...
R11 on my circuit is 15k, & all part just like in this schematic:
To Mr. Mile ...
may I change input transistor to 2SK170 ?
(have been mentioned in old post but no one make it)
If can, please tell us what need to be changed...
Regards
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sr200 studio refer.
Look at this.
I use this Elektor published curve tracer.
Keep in mind that with all theese circuits you can match small signal transistors only.
It's not recommented to match power transistors with that's circuits.
For power transistors matching you need high current and high voltage devises.
I see circuits like this in Elektor but i haven't made something like this yet.
Thanks my friend.
Look at this.
I use this Elektor published curve tracer.
Keep in mind that with all theese circuits you can match small signal transistors only.
It's not recommented to match power transistors with that's circuits.
For power transistors matching you need high current and high voltage devises.
I see circuits like this in Elektor but i haven't made something like this yet.
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59.6V on R14 .... This value is with or without servo?
63mV bace to ground Q2 is with or without servo?
Hi Mr Adrew R33=220R
This time haven't circuit diagramme on my hands (where i has write some measurments) i come back in a few minutes.
Thanks for all.
V R33=1.2V
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sr200 studio refer.
Dit you believe that raising power supply voltage affect the offset ?
O no just now i remember that asymmetric presents with servo also even if offset is zero.
Dit you believe that raising power supply voltage affect the offset ?
O no just now i remember that asymmetric presents with servo also even if offset is zero.
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Hi brother!! sorry my mistake...wrong written, I mean 10pf not 20pf...
I have some of 10pf caps but no 20pf caps. It is stated that 18 pf cap should put in the amp as compensation cap. So, which is the best practice? install 10 or 20 pf...if 20pf is the best I will put 2 X 10pf in parallel...
Thank you.
Best Regards...
This is the reason why the design was changed to a triple emitter follower for SR800
Hi Mr. Mile,
SR800 is not for share, but can we optimize this SR200?
Can I changed the resistor that AndrewT said not optimal...
I want more driver current for feeding the Sanken's(100mA bias or more)
What need to be changed please help
sr200 studio refer.
Everything starts from here.
This modification is the cause of the problem.
Today early in the morning about 5.30 o'clock i examined the amplifier again.
But this time I was sure for the pcb because it passed the point to point test.
As changing transistors and matchig didn't solve the problem, having in mind that the others' amplifiers didn't have the problem,i decided to return to the original circuit.
So i put at R11 the original value 15K.and that was all!
Thanks everyone for trying to help .
Especialy thanks Mr AdrewT who advised me to stabilize the LTP without servo.
Thanks a lot to John Balli for your instant reply in mine request for measurments.
Last but not least thanks overall feedback for his atempt to help.
Thanks again Mr.Mile for this excellent amplifier.
I also attach this hopping that it will be useful
Everything starts from here.
This modification is the cause of the problem.
Today early in the morning about 5.30 o'clock i examined the amplifier again.
But this time I was sure for the pcb because it passed the point to point test.
As changing transistors and matchig didn't solve the problem, having in mind that the others' amplifiers didn't have the problem,i decided to return to the original circuit.
So i put at R11 the original value 15K.and that was all!
Thanks everyone for trying to help .
Especialy thanks Mr AdrewT who advised me to stabilize the LTP without servo.
Thanks a lot to John Balli for your instant reply in mine request for measurments.
Last but not least thanks overall feedback for his atempt to help.
Thanks again Mr.Mile for this excellent amplifier.
I also attach this hopping that it will be useful
Attachments
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18pf is always on the board as you request for it.My post #769 from 28th July 2012
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18pf is always on the board as you reqest for it.
Replace R7,8,9,10 with 1k instead 2k2, voltage on zeners must be about 15V
Regards