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Old 20th September 2003, 05:14 PM   #1
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Default hii !! about poor 100-150W amplifer

i found this amp in the web.... and i want to ask if it will work???
and how the sound will like?

AMPLIFIER
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Old 20th September 2003, 07:54 PM   #2
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Default Amplifier

This man is pig and will be good, if he will show out and in front of gate of Jericho will exemplary shoot dead
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Old 20th September 2003, 08:09 PM   #3
skaara is offline skaara  Slovenia
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ROTFLOOOOL))))
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Old 20th September 2003, 08:29 PM   #4
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i am dont understand?!?!.....

what u meen?

it will work or not?
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Old 20th September 2003, 08:39 PM   #5
PMA is offline PMA  Europe
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He probably means that the sample shown was made in a horrible quality.
BTW - why would you like to build this amp? Just to prove if every strange design works?
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Old 20th September 2003, 09:25 PM   #6
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Default it should work

this is essentially the Citation 12 circuitry (in a darlington implementation).

it should work.
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Old 20th September 2003, 09:38 PM   #7
OliverD is offline OliverD  Germany
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DJ...

As you are obviously looking for the most power for your bucks... Build high efficiency speakers and a med power high quality amplifier! Why?

If you want p Watts into 8 Ohms, your amplifier will have to deliver an effective voltage of sqrt(p x 8) and a peak voltage of sqrt(p x 16). Therefore, you need a rail voltage of about sqrt(p x 16) + 5 at max power. Now assuming you want to drive speaker impedances as low as z Ohms, you can calculate the current that your output stage has to withstand and that your power supply must be able to deliver. Transformer power rating should be at least 1.5 x max output power.

From this, you can figure out the transformer rating, PSU caps, and number / type of parallel output transistors. Together with a case which you need anyway, those components make up about 85% of the total cost of your amplifier, if not more.

That means it doesn't make that big a difference whether you build a crappy design or a high quality amplifier - from the financial point of view. If you want a real 200 W RMS per channel into 8 Ohms, you have to spend a certain amount of money. Period.

On the other hand, wood is cheap and there are some very good but reasonably priced drivers out there. It is easy to build a good sounding very high efficiency speaker system which will rock any party with medium power amplifiers.

Please re-read the answers to your earlier posts.
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Old 20th September 2003, 11:09 PM   #8
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quote

this is essentially the Citation 12 circuitry (in a darlington implementation).

A citation 12 was a bit more complicated than this, and sounded
fairly good.

The amp above, is absolutely miserable. Bootstrapped
top current source. Nowhere near enough gain to maintain
any reasonable distortion levels. No output protection
of any kind. Horrible damping factor.

Boost the rails to +/-90 volts remove all heatsinking, and
then get 1000 watts out of it. PERFECT

quote
This man is pig and will be good, if he will show out and in front of gate of Jericho will exemplary shoot dead

I would like to see the original russian before it got translated.
Probably even funnier...
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Old 20th September 2003, 11:25 PM   #9
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Default a slightly different design

since I don't have models for the said transistors, I used slight different transistors (2n5551 in the differential pair, 2n5401 vas, 2n5551/mje15030, and 2n5401/mje15031 as output pairs in place of the darlington tips). I also used t-circuitry on the drivers.

thd about 0.01% at 20khz on 8ohm load, 0.06% at 4ohm. frequency flat out to 250khz (where the simulation ended).

Also the bootstrap design worked out very well. the variation of current going through the VAS transistors went from 130% without the bootstrap to 20% with the bootstrap.

the same basic design also works with MOSFET (I tried IRF540/9540. THD at 20Khz is 0.009%).

One thing I would like to add: it may not be enough to use just two diodes to bias the TIPs, as they are darlington. I used a Vbe multipler.
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Old 22nd September 2003, 05:04 AM   #10
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Default will this amp work?

hi there dj_bass, have you already built this amp? base on the schem, yes it will work but the question is how will it produce sound. I dont want to comment on the design bcoz i believe the designer has its own purpose why he design this amp. I agree that for you to come out with a good amp you just have to shell out something. But you can also build a medium power amp at a lower cost provide you have speakers to match that amp. For in the house listening a 50+50w rms is very adequate, you might not be able to take the full 100w when you're inside the house. there are lots of good designs in the web with powers between 50 to 80w per channel.
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