Nice, I'll wait patiently for your listening impression. First test the shunt regulators before you connect the preamp part, and then test it with no servo opamp in the socket. Finally when all functions normally insert opamp.
If I remember it correctly you asked me that already. D3, D5 and D4, D6 are here to protect M2 and M4 mosfets from to high gate-source voltage.
Yes, I did ask you before... and now I got the complete answer.
I feel awkward to be bothering you with such low level questions but it is my way to get into such difficult layouts.
I am really grateful you bother to answer.
I am now comfortable with the shunt..... but not completely at ease with the amplifier.
I still do not completely understand how the building block Q9 Q6 Q10 Q8 R18 R39 C2 works.... hope you do not mind to clarify me on that also 🙂
I feel awkward to be bothering you with such low level questions but it is my way to get into such difficult layouts.
I am really grateful you bother to answer.
I am now comfortable with the shunt..... but not completely at ease with the amplifier.
I still do not completely understand how the building block Q9 Q6 Q10 Q8 R18 R39 C2 works.... hope you do not mind to clarify me on that also 🙂
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Q9, Q6 and Q10, Q8 make a Baxandalls pairs or supper pairs. More information about it you can find here http://www.diyaudio.com/forums/anal...t-conveyor-voltage-amplifier.html#post3247524 where it was introduced first in to GainWire (mk1).
I will surely post it here once I get it working...
in my previous experiments I found that using 2SK117GRnstead of 2SK170BL for J1 does increase start catch up speed (Wanted final voltage is reached more fast).
Do you believe I could use the same devices in your schematic ?
in my previous experiments I found that using 2SK117GRnstead of 2SK170BL for J1 does increase start catch up speed (Wanted final voltage is reached more fast).
Do you believe I could use the same devices in your schematic ?
I don't have that one but looking at the datasheet it could be used, but I don't expect any change in the speed(power shunt regulator) and don't see why that is important.
In my other shunts, I must wait a long time before they reach full voltage output if using 2sk170 in the vref part.
Using the 2sk117gr, final voltage is reached in 1/10 of the time 🙂
Using the 2sk117gr, final voltage is reached in 1/10 of the time 🙂
I know... but 2sk117gr "gets home" faster than 2sk170 .. both acting as ccs in exactly the same vref setting position.
If it is connected as a CCS then you get needed current set with the source resistor. So I can't see how it could settle faster, no difference there if the current is the same.
BF245A also "catches up faster" but we have noise penalties.
It is related with TEMPCO of the fets.
It is related with TEMPCO of the fets.
It is related with Gos
Even set to the same current, these devices present less drift and get to the needed current faster than the k170.
Even set to the same current, these devices present less drift and get to the needed current faster than the k170.
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