In that case, you are good with 22 – 33 mF capacitor. Use external heatsink if possible. Check how is that done at post #342. If there is enough surface on the main amplifier heatsinks, that is an excellent solution as well.
Still hoping for a native R60 (targeting 60V primarily), even though this circuit has performed well at 58V.
The board is a little tight for heat sink fittings in that configuration.
The board is a little tight for heat sink fittings in that configuration.
Top output voltage is about 60 – 62V. It’s not related to any component approaching safe voltage limit but simply reaching designed adjustment threshold, before D1 starts to conduct current. Using R8 = 4K7 and R9 = 3K6 (part available), top voltage will be increased to 64 – 65 V.
Yeah, TL431 is interfering with Q8 heatsink. Solder TL431 in low position and rotate Q8 heatsink that its wings go around potentiometer.
Next time, I'll use SMD version of TL431. 🙂
That would be nice, but I could also use both sides of the board and distribute the parts.
I should have thought better when I built the first one, although if mounting the part that dissipates the most on a beefy sink, it kinda eliminates one side of the board as real estate.
That being said, I didn’t measure that clip-on heat sink getting very hot at all.
So maybe I am just a worry wart.
Hmmm....so the thought of a further refined 'Rxx' psu has crossed your mind, Tombo??
Maybe a bipolar psu circuit on a single board 🤩.
Hah, yes. I still haven’t decided what to build next from amplifiers and that would determine next supply required properties. My current power amplifier is so good (subjective opinion, of course, valid for me only) that I have a hard time to decide on new direction. Kind of ultimate class D is also a serious contender. Next supply will be, for sure, dual rail (positive and negative) on one board.
Anyway, I’m for the next several months occupied with a different kind of DIY. I’m setting up a new hobby workshop in the basement and plan to do a total reconstruction of my mans cave to a dedicated listening room with acoustic treatment. Lot of work for two hands.
Anyway, I’m for the next several months occupied with a different kind of DIY. I’m setting up a new hobby workshop in the basement and plan to do a total reconstruction of my mans cave to a dedicated listening room with acoustic treatment. Lot of work for two hands.
Sounds like a great plan Tombo!
Basements can be made into fantastic spaces to spend lots of time in, lots of work indeed.
I have a nice spot in the basement for my DIYA tinkering, but decided to up and take over the dining room so my family still remembers my name 🤣.
Basements can be made into fantastic spaces to spend lots of time in, lots of work indeed.
I have a nice spot in the basement for my DIYA tinkering, but decided to up and take over the dining room so my family still remembers my name 🤣.
If it goes that way, it will be Purifi module + my custom input buffer design and linear regulated supplies as one compact board. There is no way I can design a better class D than Bruno Putzeys.