Jac: I’ve been playing with another type of chipamp lately and compare it back to my Evo A and I’m experiencing the same sort of warm-up effect here. I have neither of the new power resistors in place (the 1.8 boards have yet to built up), but whether it’s now the power of suggestion or some psycho-acoustic trick my mind is playing the amp does seem to open up a bit after a period of time.
Regards,
Pete
I may have tin ears.
Currently using another chip amp also. Uses LM3886 with a resonant mode power supply.
Neither it or several My-Ref amplifiers open up after 10 minutes. I very seldom listen for more than 2 hours straight, normal is most of a CD. They seem to “gell” much quicker to my ears.
They are hard on power up, but are fantastic after a minute or two. Before the first track has finished they play fantastic. If played at background levels for several hours it still sounds the same to me.
My 65 year old ears may be letting me down.
Currently using another chip amp also. Uses LM3886 with a resonant mode power supply.
Neither it or several My-Ref amplifiers open up after 10 minutes. I very seldom listen for more than 2 hours straight, normal is most of a CD. They seem to “gell” much quicker to my ears.
They are hard on power up, but are fantastic after a minute or two. Before the first track has finished they play fantastic. If played at background levels for several hours it still sounds the same to me.
My 65 year old ears may be letting me down.
Hi there! Long time since I've jumped in the project but I'm still tuning/reworking the chassis arrangements . I started it using a big slim line 02/350 (435 x 350mm), but the WAF wasn't enough to have it in my living room. Now I'd like to get the EVO RevA mod and put in a smaller case .
So... any pics or practical advices about a very space constrained boxing? (measures and pics coming soon)
So... any pics or practical advices about a very space constrained boxing? (measures and pics coming soon)
I think more compact, even "underdesigned" - - than the original solution of Penasa, the 2U Galaxy 288 case, is difficult to find..
That brings some heat constraints, though.. In the case the 3U version of the same - is still very compact..
Ciao, George
That brings some heat constraints, though.. In the case the 3U version of the same - is still very compact..
Ciao, George
Hi, I used a Galaxy 388 (internal dimensions 310x280x80 mm).
From the photos you can see that everything fits with a little more space left. I used 20mm spacers, so LM3886 falls on the flat surface of the side heatsink, finding no grooves. This guarantees contact throughout the chip surface and perfect heat dissipation. In the hot Roman summer it only remains barely warm (I also have easy-to-drive speakers).
Ciao e buona musica
Giacinto
From the photos you can see that everything fits with a little more space left. I used 20mm spacers, so LM3886 falls on the flat surface of the side heatsink, finding no grooves. This guarantees contact throughout the chip surface and perfect heat dissipation. In the hot Roman summer it only remains barely warm (I also have easy-to-drive speakers).
Ciao e buona musica
Giacinto
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Thanks both! Absolutely inspirational!
I'm dealing with some strange problems with my car, I'll get to soldering as soon as possibile.
{ I know the hot Roman summer, I'll be there next WeekEnd! 😱 }
Hi, is anyone able to tell me please if these are the right resistors to use? Thanks!
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aii..
it seems to be the wrong value.. R033.. that is, 33mohm..
we need R330, 330mohm version...
Security Check
it seems to be the wrong value.. R033.. that is, 33mohm..
we need R330, 330mohm version...
Security Check
I use the same case but with inner chassis as it is more solid. The covers of this box are too flexible in combination with heavy transformers and put a force over Lm3886 terminals.
Thanks for confirming i am sooo stupid. I really don`t know if I want to continue spending money with this amp. I use it everyday, sounds good but I need to stop somewhere.
ouch.. from Your answer I deduct that You had bought those resistances.. I hoped that they were from some surplus..
if it help, my first order from Reichelt I have almost orxered a 5mohm one... it had been already packed when I succeed in cancelling the order..
🙁 🙁
if it help, my first order from Reichelt I have almost orxered a 5mohm one... it had been already packed when I succeed in cancelling the order..
🙁 🙁
Yes, received today. Paid only 9eu in total, not so much money but I waited sooo long for them. That`s why I`m pissed
maybe You could ask for a swap, from the seller..
but it takes much more time than simply reorder..
and some money..
but it takes much more time than simply reorder..
and some money..
Yes, this is a problem. I mostly solved it by putting 9 rubber feet, but I was thinking how to put a stiffer plate on the bottom. How did you solve it? What is the inner chassis you talk about?
Thank you for the suggestion
Ciao!
Giacinto