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Old 7th January 2013, 02:28 PM   #301
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Hi LC,

Do you have an objection for little ccs board that could be plugged on 15K place? As for TSSA 2N5462 can do that job i think. Have you a target value for ccs resistor?

Marc
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Old 7th January 2013, 02:36 PM   #302
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OK, CCS's in/out pins will be aligned, so small CCS module PCB can be installed.

Target value is around 2 k, depends on Vgs/Id curve of 2N5462.
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Old 7th January 2013, 02:50 PM   #303
Bigun is offline Bigun  Canada
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It's looking good
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Old 7th January 2013, 02:54 PM   #304
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Quote:
Originally Posted by Lazy Cat View Post
VSSA 1.4 Schematic final version
I don't understand the caps after the current sources...
I don't like parallel film caps with electrolytic neither unless some inductance or resistance between them to dump the resonance..
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Old 7th January 2013, 03:04 PM   #305
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I think the caps are necessary for AC feedback.
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Old 7th January 2013, 03:07 PM   #306
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Quote:
Originally Posted by Esperado View Post
I don't understand the caps after the current sources...
I don't like parallel film caps with electrolytic neither unless some inductance or resistance between them to dump the resonance..
These capacitors form feedback AC ground, without them amplifier is not working properly. Two in parallel to cover bandwidth currents in low Z.
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Old 7th January 2013, 03:15 PM   #307
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Originally Posted by Lazy Cat View Post
These capacitors form feedback AC ground, without them amplifier is not working properly. Two in parallel to cover bandwidth currents in low Z.
So, you have a current source for DC only ?

Do not believe that paralleling film and electrolytic caps reduce the Z at HF, it is exactly the opposite.
They make a resonant circuit with the inductance of the electrolytic situated inside the bandwidth of the amp. One of the reason some found SSA was sounding better without the film.
And, may-be, why you have this hard to dump ringing with capacitive load ?
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Old 7th January 2013, 03:20 PM   #308
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Quote:
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It's looking good
Yes indeed, it also measures very good and it is unconditionally stable. I intentionally overloaded it with 2,2 uF at 100 kHz squares without load's real component and it survived with distortions only. No output noise noticable.
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Old 7th January 2013, 03:26 PM   #309
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Quote:
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So, you have a current source for DC only ?
No it handles every possible micro current mudulations, the ones resistor cannot at least to such low levels. Tested.

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why you have this hard to dump ringing with capacitive load ?
Capacitor on output leads is sort of a short circuit linearly going down to zero with frequency rising. Since squares are row of harmonic structure, capacitor's impedance slowly eliminates high order harmonics and the result is distorted squares. Perfectly normal plot result.
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Old 7th January 2013, 03:49 PM   #310
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Perfectly normal plot result.
You had no protective inductance and resistive load when you did the square test ?
About // capacitances, some useful links:
Some useful links:
http://www.hagtech.com/pdf/snubber.pdf
http://www.ti.com/lit/an/sloa069/sloa069.pdf
http://www.n4iqt.com/BillRiley/multi...ypass-caps.pdf
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