I have 3 questions, first, what do you think the maximum temp the heat-sink would ever reach is?, second why not build the case so that it is possible to use these resistors attached to the case, that kind of limits flexibility. third what is the pitch used for signal resistors?
nope, they only make the z-foil elements to 0.44R, or so texas components tells me, the 2 leads also only go to 5 ohms, this really is custom. What is the current through these resistors also. As there is a limit on this (3A per resistor, so in these special ones about 6A).
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To build a case for DIYA means we have to use easily available parts with guaranteed long term supply.
We also have no idea of demand, so we are not willing to order special lengths, etc.
On top of that we have already said that there is no advantage to go longer than 150mm.
So we are not going to increase transport weight for all others who are happy to use MPC74.
As in any standard product, this is what we have to offer.
And we think it will suit most of the people who might be interested in building the F5X, or other FW amps.
I expect junction temperature to be below 100°C, as I always maintain.
Pitch for 0.25W PRPs is 10mm, 1W PRPs 15mm.
I shall publish the schematics again when the Gerbers are finished.
Then you are welcome to lay your own PCB to cater for all special wishes.
I am sure there are many.
Patrick
We also have no idea of demand, so we are not willing to order special lengths, etc.
On top of that we have already said that there is no advantage to go longer than 150mm.
So we are not going to increase transport weight for all others who are happy to use MPC74.
As in any standard product, this is what we have to offer.
And we think it will suit most of the people who might be interested in building the F5X, or other FW amps.
I expect junction temperature to be below 100°C, as I always maintain.
Pitch for 0.25W PRPs is 10mm, 1W PRPs 15mm.
I shall publish the schematics again when the Gerbers are finished.
Then you are welcome to lay your own PCB to cater for all special wishes.
I am sure there are many.
Patrick
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I am not asking about junction temperature about the transistor, but rather the temperature that the resistors can expect to have drawn away from them. I am sorry about any muss understanding.
Until some more experiments have been performed by your fellow countryman, this is all the information I can offer you.
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-7.html#post2346379
Patrick
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-7.html#post2346379
Patrick
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What about capacitance multiplier like in F3 as another option?
Sorry to make the issue more complicated
Sorry to make the issue more complicated
The regulator as in Zen3 is a cap multiplier, only using mosfet as pass devices instead of Darlington.
http://www.passdiy.com/pdf/zen-ver3.pdf
http://www.tcaas.btinternet.co.uk/jlhcapmult.htm
Replace R5, R6 by Zeners (as NP did), then they are the same circuit.
Patrick
http://www.passdiy.com/pdf/zen-ver3.pdf
http://www.tcaas.btinternet.co.uk/jlhcapmult.htm
Replace R5, R6 by Zeners (as NP did), then they are the same circuit.
Patrick
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OK, no worries. When you said regulator I thought you meant regulator. I should have checked the circuit.
Any opinion which is better (F3 reg or Zen3 reg)?
I don't know the F3 reg. Is it published ?
I use the Zen 3 type quit a bit, but with different FETs.
Only when there is sufficient interest and someone will do the PCB layout would I publish.
I am already regretting that I have opened 2 cans of worms !!
Patrick
I use the Zen 3 type quit a bit, but with different FETs.
Only when there is sufficient interest and someone will do the PCB layout would I publish.
I am already regretting that I have opened 2 cans of worms !!
Patrick
It is part of amp circuit. Obviously it is only single ended but it shouldn't be too hard to make it balanced.
Just one other thing. Since this is a balanced push-pull circuit would it be beneficial to apply negative feedback to the reg to reduce output impedance and improve linearity?
Just asking to get your opinion.
I will be using CRC.
Just one other thing. Since this is a balanced push-pull circuit would it be beneficial to apply negative feedback to the reg to reduce output impedance and improve linearity?
Just asking to get your opinion.
I will be using CRC.
The circuit I used has an output impedance of 0.2R.
I don't like feedback circuits, especially on PSUs.
Patrick
I don't like feedback circuits, especially on PSUs.
Patrick
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