It's just a matter of time before he goes full commercial too. Most of them do and although it is a sad thing for us DIYers, it is sometimes better for them this way. Enjoy as much as you can now.
Do
LC or any one else can you please answer my question
Can you confirm if the FO 1.4L amplifier modules in full balanced stereo configuration would be the same as the drawing in post #95.
Would 85v be ok?
Also -neg not connected due to it being internally connected to ground ?
Can you confirm if the FO 1.4L amplifier modules in full balanced stereo configuration would be the same as the drawing in post #95.
Would 85v be ok?
Also -neg not connected due to it being internally connected to ground ?
Measure ripple current and ESR at 100/120 Hz and compare to the others..
85 V from + to - or from + to GND or from GND to - or ...? Why 85 V? Do the math +/- 85 V would bring 2800 W rms/4 Ohm and that would vaporize the modules.
If you don't want to burn the modules do exactly what sch is telling you. I can not explain sch if you do not understand basics. Everything is marked and specified on the sch, why change it?
Not entirely true .... Mirand Audio is selling modules, that from what I'm reading, is pretty high performing stuff too
proton28
Here is a power supply for 1.4L.
Based on this thread and to be in safe zone, maximum voltage for 1.4L can be +/- 85V.
Also here is a pdf for 1.4M....for reference.
Lazy Cat....
I still wait your email.....
Hmm...I wondering if I needed to replace the modules.....how long will take ONLY to respond.....
Here is a power supply for 1.4L.
Based on this thread and to be in safe zone, maximum voltage for 1.4L can be +/- 85V.
Also here is a pdf for 1.4M....for reference.
Lazy Cat....
I still wait your email.....
Hmm...I wondering if I needed to replace the modules.....how long will take ONLY to respond.....
Attachments
Lazy cat,
The sch was for “Medium” modules.
What voltage do you recommend if using “Large” modules ?
I’m surprised that you recommend same voltage for ”Medium” and “Large” modules
The sch was for “Medium” modules.
What voltage do you recommend if using “Large” modules ?
I’m surprised that you recommend same voltage for ”Medium” and “Large” modules
On first page is mentioned very clear:
Supply voltage for 1.4 L................................... +/-45 to +/-85 V.
Also you have (for reference only) ,previous post of mine, a complete power supply.
I would go for double mono configuration.
Shottky fast rectifiers,two x 1KW power transformers (custom made for very low noise) and 2 x 100 000 uf/100V,follow by 2 x 100uf/250V and snubbers.
At this moment you can begin measurements of the low ripple at the power supply.
Supply voltage for 1.4 L................................... +/-45 to +/-85 V.
Also you have (for reference only) ,previous post of mine, a complete power supply.
I would go for double mono configuration.
Shottky fast rectifiers,two x 1KW power transformers (custom made for very low noise) and 2 x 100 000 uf/100V,follow by 2 x 100uf/250V and snubbers.
At this moment you can begin measurements of the low ripple at the power supply.
+/-55 V is absolute max. voltage for bridging FO L modules. Output power is proper to voltage square function, so it rises exponentially, meaning at +/-55 V PSU there will be (voltage drop on power devices subtracted) 90 Vp on 4 Ohm load and that is a lot (1012 W rms/4 Ohm). SOAR of output devices should be strictly respected, not to mention thermal considerations with heatsinking, etc. All in all take great care at amp bridging.
It would be nice to have sonic comparisons of SMPS vs old school PS like the one mentioned... I quite like old school 🙂
I understand the SMPS are more efficient, smaller, lighter, possibly cheaper and more importantly also perhaps they can deliver quicker current, so that can be a big plus.
On the negative, the longevity of these seems a big question mark, no way to repair them easily, not to mention HF rubbish or what may happen if (when?) they fail...
But the big question is: can a conventional (full grown) PS equal or beat the Hypex & Co (with the already proven additional big caps)?
Has someone performed comparisons? LC perhaps?
I understand the SMPS are more efficient, smaller, lighter, possibly cheaper and more importantly also perhaps they can deliver quicker current, so that can be a big plus.
On the negative, the longevity of these seems a big question mark, no way to repair them easily, not to mention HF rubbish or what may happen if (when?) they fail...
But the big question is: can a conventional (full grown) PS equal or beat the Hypex & Co (with the already proven additional big caps)?
Has someone performed comparisons? LC perhaps?
I have heaRD the difference WitH other modules ( Hypex Ncore) I and all the others on the room prefered " OLD SCHOOL".
The discussion on SMPS vs linear supply popped up before, for example in the NC400 thread.
The problem is that not all SMPS's are the same, and this is also the case with linear supplies.
Especially with power amps which draw alternate current from the power supply these differences can become more apparent.
For example an unregulated linear power supply with 1 ohm of DCR compared with another linear supply with 2 ohm of DCR. When the amplifier draws current peaks along with the music, the higher DCR supply will cause more voltage drop on the supply lines and the amplifier will sound more compressed.
SMPS have their own peculiarities; not all of them are regulated.
Conclusion can be that a good comparison between old and new school is not easy to do.
The problem is that not all SMPS's are the same, and this is also the case with linear supplies.
Especially with power amps which draw alternate current from the power supply these differences can become more apparent.
For example an unregulated linear power supply with 1 ohm of DCR compared with another linear supply with 2 ohm of DCR. When the amplifier draws current peaks along with the music, the higher DCR supply will cause more voltage drop on the supply lines and the amplifier will sound more compressed.
SMPS have their own peculiarities; not all of them are regulated.
Conclusion can be that a good comparison between old and new school is not easy to do.
Yes I know, hence me asking 🙂
However, most threads I have read are indeed linear supply vs SMPS... but on class D amps (Hypex & co)
That is IMHO not relevant here as Class D pump current differently / in a different manner on the PS, hence IMHO not really "telling the answer" when it comes to trying to evaluate them for FO amps - or any Class A/B amp.
I would rather like to read reports re different PS for this FO amp... But that is all IMHO, glad to be proved wrong.
Claude
However, most threads I have read are indeed linear supply vs SMPS... but on class D amps (Hypex & co)
That is IMHO not relevant here as Class D pump current differently / in a different manner on the PS, hence IMHO not really "telling the answer" when it comes to trying to evaluate them for FO amps - or any Class A/B amp.
I would rather like to read reports re different PS for this FO amp... But that is all IMHO, glad to be proved wrong.
Claude
I'm starting to look forward to the 1 kw amp... if you can do it with the same low distortion etc as the current offerings, it would be nothing short of amazing.
Some guys from the forum managed to visit Audio Video Show 2017 - Warsaw. Today still possible to hear our system, warmly welcome.
