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Old 13th December 2004, 07:25 PM   #21
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Are you willing to mention the kind of bipolars before we are sitting under the Christmas tree ?
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Old 13th December 2004, 08:14 PM   #22
DRC is offline DRC  United Kingdom
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Default Did you consider ...

andrew (anli),
you rejected single ended OP's due to their low efficiency. Did you consider the case of single ended with active current sources (aleph / aleph-x) and their improved efficiency ?

dave
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Old 13th December 2004, 08:41 PM   #23
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Default Re: Did you consider ...

Quote:
Originally posted by DRC
andrew (anli),
you rejected single ended OP's due to their low efficiency. Did you consider the case of single ended with active current sources (aleph / aleph-x) and their improved efficiency ?

dave

Dave,

Is it possible to point to the schematics variant you are talking about?

Andrew
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Old 14th December 2004, 02:04 PM   #24
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Andrew,
All of the aleph series amplifiers use a 'load current sensing' active current sinks (ie they are not constant current) - I think that is what 'aleph' is intended to refer to.

As you asked about bridge load amps :

Aleph-X

If I recall correctly (?), the gain of the 'current source(s)' is ~x1.5 so the peak load current is somewhat higher the standing current would suggest (and the current in the other CS decreases at the same time).

As I see it - it is more efficient than a true bridge load, constant current, single ended amp.

dave
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Old 14th December 2004, 02:40 PM   #25
anli is offline anli  Russian Federation
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Quote:
Originally posted by DRC

...
As I see it - it is more efficient than a true bridge load, constant current, single ended amp.
...
dave
Agree. But I prefer:

- to exclude capacitors from signal chains,
- use a push-pull topology to reduce demands to power supplier.

There are different shcools (is this word appropriate here? :-) how to
design. One of them - to use fewer (but expensive) parts. At this case
audio quality depends on, as example, concrete capacitors models
at very high degree. And I go to by a next capacitor to replace the old one,
then - next, and so on. One day, I see the last capacitor cost is about the
whole amplifier cost :-) You see, I overdraw the reality :-) I just want to say,
it is more interesting to me to resolve the problems schematically.

Both ways are good: each scool has nice realisation examples.
It's matter of taste, I think.

Andrew
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Old 14th December 2004, 04:29 PM   #26
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Andrew, I agree with you on the issue of expensive components - I do not think it is money well spent and prefer to use low cost parts myself (preferable the ones in my junkbox)


Slightly off topic (sorry, no MOSFET's and not even a complete / tested design !!!), here is my own take on an "aleph-X like" amp using very low cost components :

Daves amp !

I went for a SE design as I could see no benefit in the complexity of push-pull, when using a bridge-load design, as source & sink are fully symmetric. BTW, my current source works like a differential current generator (i hope !) and should produce 'optimum' efficiency.

I am interested in why you made push-pull and bridge-load a requirement ???

dave
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Old 14th December 2004, 05:01 PM   #27
anli is offline anli  Russian Federation
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Quote:
Originally posted by DRC

...
Daves amp !
...
I am interested in why you made push-pull and bridge-load a requirement ???

dave
I need some time to understand your project and to read that thread.

As for push-pull - the topology seem to be much more tolerant of PS pulsation,
I think.

Andrew
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