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
This man is pig and will be good, if he will show out and in front of gate of Jericho will exemplary shoot dead
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? 😉
BTW - why would you like to build this amp? Just to prove if every strange design works? 😉
it should work
this is essentially the Citation 12 circuitry (in a darlington implementation).
it should work.
this is essentially the Citation 12 circuitry (in a darlington implementation).
it should work.
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.
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.
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...
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...
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.
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.
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.🙂
🙂 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.🙂
I built this some weeks ago.
It sounded quite well - but it blew when using with 45V rails and 8 Ohm speakers playing shortly loud music... After that I didn´t try it again - for sure there should be more output-transistors added.
It sounded quite well - but it blew when using with 45V rails and 8 Ohm speakers playing shortly loud music... After that I didn´t try it again - for sure there should be more output-transistors added.
technics hii !!
wath is "quite well-sound" dor u ? what dont sound good??
and do u have pics???
and if i run this on 45V +- or more like 55V -+ u say that need more output transistors???
it is realy halp me !!
wath is "quite well-sound" dor u ? what dont sound good??
and do u have pics???
and if i run this on 45V +- or more like 55V -+ u say that need more output transistors???
it is realy halp me !!
I actually have an old citation 12 in my basement, i just
finished testing it for fun.
At most into 8 ohms it puts out (one channel driven)
about 65 watts.
finished testing it for fun.
At most into 8 ohms it puts out (one channel driven)
about 65 watts.
kevin gilmore said:
that's about right. The amp uses 42V rails. assuming a 6v drop on the output devices / rail voltage under load, peak current through a 8ohm load is (42-6)/(8+0.27)=4.4A. so RMS power is (4.4)^2*8/2=75w.
Dj BASS AMP said:
Sound was just fine. I didn´t hear a hum or noise. Checking a sine wave on an osziloscope did also look fine, but I didn´t make any further measurements. Because at least it isn´t the amplifier that makes music, but the speakers and the room they are in...
I built the version notified in the other thread about this amplifier. So for schematics just look there. It is really very simple to build.
I would use more output transistors - but there might be other problems, if using with higher rail voltages. You could just give it a try...just built one channel for about 5$ and test it...I would recommend using at least 2 pairs of output transistors.
Don´t forget to post your results here ;-)
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