Possible? Of course, but you joined the forum today and new members can’t immediately send private messages.
If your questions could be of general interest, better ask here.
If your questions could be of general interest, better ask here.
I am most impressed with your work on this power supply. It appears to be well thought through and tested by many.
My experience and opinion is that a very good power supply is mandatory for a very good power amplifier. There are explanations somewhere in my threads.
As said, there is an abundance of excellent power amplifiers, but almost no very good regulated power supplies. So, I decided to design some.
As said, there is an abundance of excellent power amplifiers, but almost no very good regulated power supplies. So, I decided to design some.
For those looking for the out of stock PA-T21-38E, just buy the PA-T22-38E. Then remove one clip, and move the other to the center. Now you have a PA-T21-38E.....
A quick pinch on the clip, and little "musical chairs", and "boom goes the dynamite". Now you have a PA-T21-38E.
A quick pinch on the clip, and little "musical chairs", and "boom goes the dynamite". Now you have a PA-T21-38E.
Good thinking. While the clips are removed a hole an be drilled and M3 thread can be applied. Works better in the long term.
Having the hole already applied makes it way easier than applying the hole afterwards.
Having the hole already applied makes it way easier than applying the hole afterwards.
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I’ve put a note about replacement P/N for the main heatsink at the first post. 👍
Drilling and tapping the heatsink provides very tight thermal connection, but clip is adequate as well (performing well for years in my amplifiers).
Jean-paul’s solution: https://www.diyaudio.com/community/...ilter-and-super-regulator.420933/post-7888880
Drilling and tapping the heatsink provides very tight thermal connection, but clip is adequate as well (performing well for years in my amplifiers).
Jean-paul’s solution: https://www.diyaudio.com/community/...ilter-and-super-regulator.420933/post-7888880
You may notice that all the items I show are not available at Mouser at this time. Some of the items show an expected delivery this Fall.
I may, or not, as there are other suppliers like DigiKey. TME ... 😉
DigiKey has required RF filter and EEH-AZA capacitor in stock.
TME has CSD19533KCS in stock.
There is really a lot of other USA suppliers that can be checked for missing parts availability.
DigiKey has required RF filter and EEH-AZA capacitor in stock.
TME has CSD19533KCS in stock.
There is really a lot of other USA suppliers that can be checked for missing parts availability.
RV1
Using the example of 40vdc output, how much voltage variation does RV1 provide?
Does it provide 0 - 40?
Using the example of 40vdc output, how much voltage variation does RV1 provide?
Does it provide 0 - 40?
RV1 covers the whole operating/adjustment range from 10 – 60V. It is possible to adjust output below 10V (theoretically some 5.5 V is minimum), but proper operation is only down to 10V minimum and, for the upper range, adjustment will top at about 64V.
In example, if regulator output voltage is adjusted above available input voltage, regulator will start to flash red LED with gentle output voltage jumps down at every flash. This is sort of a hiccup mode and is nothing to worry about, just an indication that you have to turn RV1 a little counter clockwise to reduce output voltage.
In example, if regulator output voltage is adjusted above available input voltage, regulator will start to flash red LED with gentle output voltage jumps down at every flash. This is sort of a hiccup mode and is nothing to worry about, just an indication that you have to turn RV1 a little counter clockwise to reduce output voltage.
With my need for 52vdc and 4.85A does your statement define that I should be considering a 48,500uF capacitor? That is not going to be easy to accomplish, do you have a recommendation?
The amount of capacitance needed will be easier to accomplish than the tremendous amount of heat to dissipate.
52V x 4.85A = 🔥
52V x 4.85A = 🔥
Maybe it is a good idea to check the amplifier with that requirements. More than 250W dissipation to produce a few Watts in 2 loudspeakers seems non optimal. 250W also will require large heatsinks and fans (the nasty neighbour in audio). The circle one should not enter 🙂
It’s a rule of some very wide thumb. 🙂
It applies only in the case of constant load or class A amplifiers and is related to intention of keeping input to output voltage difference, and thus dissipation, low. With 110 dB ripple rejection, input voltage ripple is not an issue.
With class AB, there is a wider input voltage change under load, so one should use 3-5 V headroom as a start and usual reservoir capacitances are OK, as average load is low.
For constant large currents, we have to use large external heatsinks. In such a case, separate capacitor (say some large screw terminals type like this one) can be connected with short twisted wire pair to C2 terminals at the PCB.
Your requirements looks like max. load for some class AB amplifier.