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Old 1st April 2012, 09:17 PM   #2301
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by MiiB View Post
This could be a suggestion....
Very very close to the circuit of my Mirand A1 V1.1!?!!
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Old 1st April 2012, 09:19 PM   #2302
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Quote:
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Very very close to the circuit of my Mirand A1 V1.1!?!!
I thought you work together.
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Old 1st April 2012, 09:21 PM   #2303
sonnya is offline sonnya  Denmark
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Yes but i haven't seen this mod.
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Old 1st April 2012, 09:23 PM   #2304
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MiiB is fast hehe, I'm sure he's up to something or just experienced the sound of SSA.

It would be really nice to see the whole sch.
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Old 1st April 2012, 09:26 PM   #2305
sonnya is offline sonnya  Denmark
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We are two different types of engineers.

We have both been listening to it. Ask him what he thinks!
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Old 1st April 2012, 09:27 PM   #2306
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I think the basic topology is tremendous. You have attacked the output in a unique manner..where you aim to remove the P to N differences. I have fitted a current dumping error correction circuit on the version I have built. which by the way sounds rather ok...

Now to the house keeping. I do believe that the weakest part of this fine circuit and the very reason why it does not simulate particularly well is the poor relations between the impedance of the current drive and the feedback currents. The basic amp is basically fed from a 1Kohm current source..which is way too low to prevent the feedback currents from modulating the drive-current. This is the main source of error in the circuit and by fitting high (very high) impedance current-sources specs are terrific. I will not show my housekeeping here....But I'am quite sure you catch the direction.
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Old 1st April 2012, 09:28 PM   #2307
sonnya is offline sonnya  Denmark
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By the way. Good you replaced the zeners by LM431!!! The Zeners mess things up!
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Old 1st April 2012, 09:28 PM   #2308
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We are two different types of engineers.

We have both been listening to it. Ask him what he thinks!
OK , MiiB what's your opinion regarding SSA sound? What was the sch you'd experienced?

Last edited by Lazy Cat; 1st April 2012 at 09:43 PM.
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Old 1st April 2012, 09:39 PM   #2309
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By the way. Good you replaced the zeners by LM431!!! The Zeners mess things up!
Yeah, I knew that from begining, TL431 makes much more stable current supply to the bridge, unaffecting the fixed cascodes base potential, still current sources puts relations to another level. OK, tracking cascodes at input and VAS again another story, so all together combined I'm not surprised it is tremendous.

Sound?
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Old 1st April 2012, 09:51 PM   #2310
sonnya is offline sonnya  Denmark
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The use of tracking cascode should be done with care as i have seen oscillations just above or in conjuction with 180 degree phase shift.

But if remember right, then there is a lot of measurements/simulation of different type of VAS stage floating around in here done by a french guy 7 - 8 years ago.
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