Hi,
thanks again for your reply.
Well....i have been thinking this through quite a few time (i am talking about DC offset).
I came up with this "philosopy":
to make sure you are protected against DC at the output....either use DC or output coupling cap.
I could trim the circuit but at the output of the MC one day i could easily find 2-3mV due to compontents aging and then a propagation at th eoutput....and it could cause damages.
So my thought is...to cap couple with very good film cap (i am planning on using Teflon aura 1uF/ 330Kohm).
I haven't checked the long term drifting...but it seems to be really stable... but of course it is still aprototype and so is in evaluation.
well the drivers in the reality are just biased to their optimal 5-6mA but yet i will have to make some measuremetns I still havebn't really played with this section yet.
I don't see the need to parsallel there...but i will try.
Interesting indeed the 150mA: is it not a little too much? but i guess i can try to burn as much as i can on the heatsinks i was planning on using.
Well...they actually can take 9-10W at +40C.
thanks again for your reply.
Well....i have been thinking this through quite a few time (i am talking about DC offset).
I came up with this "philosopy":
to make sure you are protected against DC at the output....either use DC or output coupling cap.
I could trim the circuit but at the output of the MC one day i could easily find 2-3mV due to compontents aging and then a propagation at th eoutput....and it could cause damages.
So my thought is...to cap couple with very good film cap (i am planning on using Teflon aura 1uF/ 330Kohm).
I haven't checked the long term drifting...but it seems to be really stable... but of course it is still aprototype and so is in evaluation.
well the drivers in the reality are just biased to their optimal 5-6mA but yet i will have to make some measuremetns I still havebn't really played with this section yet.
I don't see the need to parsallel there...but i will try.
Interesting indeed the 150mA: is it not a little too much? but i guess i can try to burn as much as i can on the heatsinks i was planning on using.
Well...they actually can take 9-10W at +40C.
and that's still only 3W Pq for 150mA bias.Nrik said:
Just 8% of Pdmax and still no need for a cascode on the outputs.
This would have a ClassA output of 290mApk.
Where would that current go?
.. I thought you were making a poweramp - not a RIAA 
Forget all my advices except the cascoding of the drivers. 😀
Forget all my advices except the cascoding of the drivers. 😀
eheheh...that's why i wasn't fully following you.
Even so, the output stage does sound better...as everything else...or almost....at higher bias.
I think 20-25mA would be sufficient....i could even go for 35-40mA.
The reason for cascoding is not to handle more power is to take advantage from capacitance and distortion reduction.
Do you havae any sugegstion for better output devices other than 9610/610 (which they do sound fine) to use/try for this application?
Even so, the output stage does sound better...as everything else...or almost....at higher bias.
I think 20-25mA would be sufficient....i could even go for 35-40mA.
The reason for cascoding is not to handle more power is to take advantage from capacitance and distortion reduction.
Do you havae any sugegstion for better output devices other than 9610/610 (which they do sound fine) to use/try for this application?
eheheh...that's why i wasn't fully following you.
Even so, the output stage does sound better...as everything else...or almost....at higher bias.
I think 20-25mA would be sufficient....i could even go for 35-40mA.
The reason for cascoding is not to handle more power is to take advantage from capacitance and distortion reduction.
Do you havae any sugegstion for better output devices other than 9610/610 (which they do sound fine) to use/try for this application?
Even so, the output stage does sound better...as everything else...or almost....at higher bias.
I think 20-25mA would be sufficient....i could even go for 35-40mA.
The reason for cascoding is not to handle more power is to take advantage from capacitance and distortion reduction.
Do you havae any sugegstion for better output devices other than 9610/610 (which they do sound fine) to use/try for this application?
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