How does this adjustment compare to 26mVre?...............NS OPS -> 65-70mA per pair = ................
How does this adjustment compare to 26mVre?
It's equal to around 15mVre (70mA * 0R22) - this non-switching configuration has the lower optimal bias value than normal (according to distortion measurements on the prototype).
Assuming, the bias clamping mechanism is tuned the right way.
Thanks, useful comparison.It's equal to around 15mVre (70mA * 0R22) - this non-switching configuration has the lower optimal bias value than normal (according to distortion measurements on the prototype).
Assuming, the bias clamping mechanism is tuned the right way.
You mean R17=R22?I normally use a slightly different topology for non-inverting servo, utilizing a single capacitor.
Important thing - resistor pairs must be equal:
R18 = R24;
R12 = R22.
Idle current
Hi,
I have a simple question about (your) output stages.
For the future I'am planning a 3 way activ speaker system.
And I want to estimate the idle current.
What is the idle current of a complimentarily pair bipolar transistors (e.g. NJW0281g/NJW0302g in the NS-OPS or slewmaster)
or mosfet complimentarily pair (e.g. IRFP240/IRFP9249 in VHEX+ in the slewmaster)?
Is there a difference if the current is adjusted optimal?
Hi,
I have a simple question about (your) output stages.
For the future I'am planning a 3 way activ speaker system.
And I want to estimate the idle current.
What is the idle current of a complimentarily pair bipolar transistors (e.g. NJW0281g/NJW0302g in the NS-OPS or slewmaster)
or mosfet complimentarily pair (e.g. IRFP240/IRFP9249 in VHEX+ in the slewmaster)?
Is there a difference if the current is adjusted optimal?
Please Valery can you check this?Oops... yes! Typo
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Hi,
I have a simple question about (your) output stages.
For the future I'am planning a 3 way activ speaker system.
And I want to estimate the idle current.
What is the idle current of a complimentarily pair bipolar transistors (e.g. NJW0281g/NJW0302g in the NS-OPS or slewmaster)
or mosfet complimentarily pair (e.g. IRFP240/IRFP9249 in VHEX+ in the slewmaster)?
Is there a difference if the current is adjusted optimal?
Hi Ampi,
Idle current depends not only on the output device type (BJT, MOSFET, etc.), but also on the nuances of particular topology.
I thought I gave you the answer in Post #1600. Did I?
Cheers,
Valery
Please Valery can you check this?
Looking good. It would be an interesting experiment
Just a note; on my Symasui, the servo works just fine. The issue is that there is about 2v offset at turn on. Within about 4 or 5 seconds the servo corrects it and it drops to zero offset. I assume that Thimios is working on bringing the initial offset closer to zero so the servo doesn't have so much to correct. Is this right?
Just a note; on my Symasui, the servo works just fine. The issue is that there is about 2v offset at turn on. Within about 4 or 5 seconds the servo corrects it and it drops to zero offset. I assume that Thimios is working on bringing the initial offset closer to zero so the servo doesn't have so much to correct. Is this right?
Hi Terry,
In general - yes, however we observed certainly strange servo behavior, which is not related to any design issues - Pete's integrator is just fine. Thimios is trying to localize the root of the issue - in his case, servo's involvement leads to the offset increase, comparing to no-servo version...
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