thank you comments🙂
you will find the space is very useful.
for example,if do the power supply of pre-amp with this set of boards,can install the international rectifiers(D37-R,Package)
you will find the space is very useful.
for example,if do the power supply of pre-amp with this set of boards,can install the international rectifiers(D37-R,Package)
I plan to set up the third round in the first week of December, offer with kits. anyone interested can join in😉
BTW,I am on vacation now,sorry to delay.
digi
BTW,I am on vacation now,sorry to delay.
digi
How hot do these regulators get?
I am using two LM338 per channel in a dual mono GC.
So thats two of these for one LM3875 IC with a transformer with an output of 2x25V.
Would a piece of aluminium say 10x30x140mm be enough?
I am using two LM338 per channel in a dual mono GC.
So thats two of these for one LM3875 IC with a transformer with an output of 2x25V.
Would a piece of aluminium say 10x30x140mm be enough?
Thanks for the boards Digi, they look great!!
a few questions:
What to do with the holes marked "mute, DC+, DC-?
Thanks for answering and your great work.
a few questions:
What to do with the holes marked "mute, DC+, DC-?
Thanks for answering and your great work.
http://www.diyaudio.com/forums/showthread.php?postid=462987#post462987
Mute, there you should place a resistor under the pins of the LM3886.
Mute, there you should place a resistor under the pins of the LM3886.
Peranders,
Do you mean a resistance between the hole called "mute"and a pin of the LM3886?
If i dont want to use the mute, can i just ignore the hole marked "mute" ??
Do you mean a resistance between the hole called "mute"and a pin of the LM3886?
If i dont want to use the mute, can i just ignore the hole marked "mute" ??
NO! If you don't have the MUTE resistor the amp will be completely silent!
If you check the datasheet of LM3886, page 15, bottom right. There you have a graph over the resistor(or current) vs. attentuation.
If you check the datasheet of LM3886, page 15, bottom right. There you have a graph over the resistor(or current) vs. attentuation.
maxw said:
how many is the drop voltage of the LM338?
the heatsink that I have used is a piece of aluminium 80¡Á138¡Á40mm,an output of 2X18VDC.it is warm,can touch with finger.
in my amp,the drop voltage is 4V per regulator(the transformer is 2X18VAC,then 22VDC to the regulator chip,adjusting,then output 18VDC).
in the attached pic,the upper one is the heatsink that I am using.
thank you Peranders🙂
Attachments
I guess it will be like 25VAC out, rectified to 35VDC then regulated to 31V.digi01 said:
digi01 said:
Thanks. I think my aluminium will be OK considering they are only powering one channel so they will not be providing much current compared to a stereo set 🙂
I see from the WIKI that my boards shipped on the 26th of November. How long does it take for packages to get to the USA?
so small and so nicely made. Thanks.- Status
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