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Old 26th December 2005, 10:30 PM   #111
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Lars, of course I know that!

Therefore:

"In fact i can only advise everyone against building the oversimplified amplifier circuits, you will never get a very good result from that, so you are really wasting your time."

Amen!
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Old 26th December 2005, 10:54 PM   #112
boxedin is offline boxedin  Canada
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i won't be discouraged!.
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Old 26th December 2005, 11:27 PM   #113
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Quote:
Originally posted by boxedin
i won't be discouraged!.
No one has intended this, but when You "invest" a little bit more in ( cheap) parts You will get at last a much better result!

Bethink that powersupply and housing costs much more (also time!) then the few (more) smallsignal components.

Heinz!
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Old 27th December 2005, 07:08 AM   #114
rmgvs is offline rmgvs  Netherlands
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Default mini-aleph

To Lars as asked in post #104:

http://www.kk-pcb.com/mini-a.html

Would be nice to have such a simple circuit with only BJT's. Two stages, single-ended, moderate amount of overall negative feedback, no output cap betweeen amp and speakers, fairly efficient (like push-pull class A that is), easy to build, measures ok, reasonable amp to drive from normal preamp etc.
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Old 9th July 2008, 11:38 AM   #115
lineup is offline lineup  Sweden
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Default Re: mini-aleph

Quote:
Originally posted by rmgvs
To Lars as asked in post #104:

http://www.kk-pcb.com/mini-a.html

Would be nice to have such a simple circuit with only BJT's. Two stages, single-ended, moderate amount of overall negative feedback, no output cap betweeen amp and speakers, fairly efficient (like push-pull class A that is), easy to build, measures ok, reasonable amp to drive from normal preamp etc.

Lars Clausen, Nelson Pass & me, Lineup + others have here posted some 'simplest bjt' circuit suggestions.
*** Is it possible to build as simple as Mini-Aleph using bipolar only ??

I would say: NO and I would say: YES.

To build a simple working Power Amp is maybe by some opinions easier with MOSFET.
If we would take a bit increased distortion (probably a bit of 2nd harmonics).
If we want a 'better hifi' (lower distortion), it is just as difficult/easy with either MOSFET or BJT.
If we can take a bit of distortion ( so called 'lowfi'), I would say it no more difficult to build a 'simplest amplifier' with bipolar.

May I add,
that to build a good amplifier, in any respect, always takes a great deal of work & knowledge.
Mainly, I conside it good To Know your transistors & Components well.
And when you have used 'your' similar devices in like 20-30 applications,
you will know better how to use them .... and how not to
---------------------------------

For example,
when I use my olden golden op-amp NE5534 .. I know how to set it up.
So it works very good
This does not mean it is no better than modern opamps.
Just that it takes time to learn new opamps and try them in 20-30 applications.
If I took me the time, I would get better results with them.

My Bottomline:
- Better to use a device/component that you know
than
- Use some 'better' device, you can not handle properly.
or
- You may have to spend some time, trial & errors to Get More Knowledge.


Lineup audio regars

_______________________________________________
PS. Nelson Pass knows IRF9610 and IRF240
.. like his own backyard ....
He has used them not 20-30 times .. but more like 200-300 times.
And can tell you right away what is good and not so good way using IRF9610 / IRFP240
if you wake him up any time in his night sleep !!!!
DS.
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Old 9th July 2008, 11:49 AM   #116
SSassen is offline SSassen  Netherlands
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Geezzz, can you perhaps lay off the old topics? Your reply brings absolutely nothing to the table that would make it even worthwhile to read, its just a personal opinion really.

Cheers,

Sander Sassen
http://www.hardwareanalysis.com
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Old 9th July 2008, 09:45 PM   #117
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Default Very unkind way to talk with old Line up

I do not like this dark side way to speak things...maybe true but the bad truth... cannot be positive or produce any pleasure.

Mr. Sassen is included into my 2 persons ignore list.

regards,

Carlos
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Old 9th July 2008, 09:58 PM   #118
fotios is offline fotios  Greece
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Quote:
Originally posted by SSassen
Geezzz, can you perhaps lay off the old topics? Your reply brings absolutely nothing to the table that would make it even worthwhile to read, its just a personal opinion really.

Cheers,

Sander Sassen
http://www.hardwareanalysis.com
Oh dear!
What problem have you with lineup? You have take him to hunting today. This is not polite.

Fotios
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Old 10th July 2008, 12:27 AM   #119
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Round and round this thread goes. Might as well throw another out there. Have built this one many times. Sounds good and meets most of your guidelines.
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Old 10th July 2008, 01:05 AM   #120
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Quote:
Originally posted by jerluwoo
Round and round this thread goes. Might as well throw another out there. Have built this one many times. Sounds good and meets most of your guidelines.
Could you just snip off the front end and use it as a power follower?

se
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