Intended speakers have a lowest 4 Ohm valley at power range 200hz-800Hz, but 95dB/1W, has the mojo for those?
Salas...
Install ALF16N16 and ALF16P16 and reduce RF and RG to 499R and 49.9R
C12 and C13 should be 220pF.
To for the lower gain as your speakers are very sensitive....
Install ALF16N16 and ALF16P16 and reduce RF and RG to 499R and 49.9R
C12 and C13 should be 220pF.
To for the lower gain as your speakers are very sensitive....
Phonographic source, low mc cart, not helping. I will use it as 26dB and see how it goes first. SSA 26dB Sziklai p2p A/B 175mA bias source follower proto was boom rocking them.
A cap multiplier was madatory on my build. Otherwise there was a small hum. I think that behavior is typical for class A amps with low open loop gain. See the JLH 10W.
If it will do that I will multiply the snap-in F&T with a cheap slug then, TIP3055 maybe. So it will not oscillate or something. Yes?
That was what i was thinking.... I have a very small amount With my Ear less than 5 cm from the cone but it is a sub 90db speaker
My TSSA is dead quiet. Even on my plus 95dB speakers, It is so scary that i check if the amp is off when i leave the room.
No, its direct radiator stiff surround 6X9 ovals in parallel, and a 6.5inch PHL in another box above them. Positively I meant. That SSA had no problem grabbing at 26dB. Just checked the OLG its 45dB, a 2 stage amp too and the output is a follower. So its A=178, comparable to stock 1.6 TSSA. Maybe the stiff surrounds enjoy some Zo in their small box. Probably.
Of course, such an open loop bandwidth needs each node of the amp to all have very close roll off frequencies , So the phase will turn very quickly at the high end, because the high Q low pass filter it represent..
Because it happens at such high frequencies, the slightest track is a coil and, all along with parasitic capacitances, has a great influence. So are each component's influence.
But, once it is stable, it stays stable ;-) So is mine.
I tried mine with 10µF, it can be stabilized, increasing the feedback compensation cap to flatten the hf response under such a charge and reduce the input filter frequency to flatten the square waves. The amp see all its wonder reduced: less bandwidth and less slewrate, of course.
Oh I misunderstood, apologize Sonny
BTW did you have opportunity yet to listen to NC400 module? I only see praises all around the net.
Hm...interesting question😀
Good morning, Mister Lazy Cat,BTW did you have opportunity yet to listen to NC400 module? I only see praises all around the net.
Once SSA+PSU+Protection of the CSSA finished, your mission, should you choose to accept it, will be to Equal or overkill it with your own Class D amp version.
As always, should you fail in your efforts and we will deny any knowledge of your actions.
Bandwith and slewrate are not correlated, TIM is not caused by NFB. Please read some books and try not to confuse DIYers here with wrong explanations.
dado
For VFB amps it is the case, that slewrate is not defined by bandwidth.
For CFB in simple:
Bandwidth is defined by time constant Cdom*RF.
Slewrate is defined by Cdom*RF and applied voltage on the summing point. (Diamond buffer)
For CFB in simple:
Bandwidth is defined by time constant Cdom*RF.
Slewrate is defined by Cdom*RF and applied voltage on the summing point. (Diamond buffer)
OPEN LOOP Bandwith and Slewrate are correlated, that's what i wrote. Please, read correctly and/or learn.
Open loop bandwidth is an envelop curve, witch shows the max gain an amp is able to provide for each frequency.
To understand how bandwidth depend both of the open loop bandwitch and gain factor of an amp, please, read:
Gain?bandwidth product - Wikipedia, the free encyclopedia
To understand what is slewrate, please read: http://en.wikipedia.org/wiki/Slew_rate
TIM, (also called slewrate distortion 🙂 is produced when the amp is not fast enough to follow the correction signal, please, learn or try to understand.
Please read some books and try not to confuse DIYers here with YOUR wrong assertions.
And, by the way, please, learn in the same time how to post in a non aggressive and disagreeable way, and not be ridiculous.
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I think we professionals and many amateurs know what Gain-Bandwidth, Slew Rate, Frequency Response, Closed Loop Bandwidth, Open Loop Bandwidth, Rise Time and such is. Still i am surprised that the discussion about the definitions comes up all the time. Usually the terms are mixed up and misinterpreted badly. Many think for example that Rise Time and Slew Rate are the same although it is quite easy to look it up on the net or in books from Self, JLH, Cordell etc.