Perhaps you can augment my post with your collection? PCB layouts, BOMs, photos of confirmed builds etc
I suggestted splitting this Thread into individual amplifier Threads.
I was told to **** off.
Then watch them slide off into oblivion. 🙄
All that is needed is a periodic update of post #1 to point to the various designs.
As this is a "living" index, we need to quote it each time we add to it, otherwise we will keep on having to go back and search. If Apex Audio could point to the index post from post 1 that would be helpful.
Here is an addition by Still4given for AX33...
Here is an addition by Still4given for AX33...
Here is a collection of just some of the schematics from Apex Audio over the course of time in this thread. These were obtained from using the search feature and I am missing many but think it's a good start if others can add to this, and also add PCB layouts - use the quote feature so it is all intact. We can perhaps begin to use this as a "Living Index" to the profound productivity and good will that Apex has given us.
FX8 (50w) - uses lateral FETs:
AX11 (50w):
AX11TEF (50w):
AA11 (class A):
AX13 (50w?):
AX14 (80w):
FX14 vertical MOSFET (80w):
NX14 NMOS amp (80w):
AX15 (80w full symmetric amp):
AX16 (80w):
AX17 (80w):
AX18 (80w):
AX20 (120w):
BX20 (w?):
AX30 (w?):
AX33:
AX40 (?w):
It may be of general interest in this thread - anyone making one of the larger amps, I have tested the Abletec 450w 53v SMPS with a class AB amp and it works very well. A nice PSU for $25 - can save some cash and weight for your next amp project.
http://www.diyaudio.com/forums/clas...ual-rail-450w-supply-20-a-12.html#post4732609
20mV ripple after passing output through a Dx PSU filter bank. It has 190mV ripple without the Dx PSU so the filter is needed to keep noise levels down.
If I used my newer CRCLC PSU, I think the ripple would probably be <5mV.
http://www.diyaudio.com/forums/clas...ual-rail-450w-supply-20-a-12.html#post4732609
20mV ripple after passing output through a Dx PSU filter bank. It has 190mV ripple without the Dx PSU so the filter is needed to keep noise levels down.
If I used my newer CRCLC PSU, I think the ripple would probably be <5mV.
One feeds it with pics, PCB layouts, and BOMs - or links to those items. It will grow with user participation. I managed to put it together in about an hour, just think if the 500 people reading this thread would contribute to it by adding links how useful it could be. Maybe there should be a Wiki for Apex amps and then we could indeed collaborate on editing and updating an index with diagrams, text, layouts, etc. For now, lets use this to collect content.
'It would be more useful if you include the Post # for each schematic so if someone is interested in building it they would be able to know where to start.
PS those last two schematics you show are A33, A40 not AX33,AX40
PS those last two schematics you show are A33, A40 not AX33,AX40
How?
When one clicks on quote one normally expects to see the whole post and then one can add to that quote.
But your post when clicked on "quote" comes up with just a few lines of text.
HOW do we use it?
Constantly quoting a single post with tons of embedded images will make this topic even more unreadable then it currently is. Personally, I would leave topic management in the hands of original topic poster, Mr. Mile himself.
Oh, and you have missed quite a few of the CFA amplifiers in your list:
A9, AX9, A17, A23, FX9, A15, etc...
If everyone must add/insert to a file/post, there will be unnecessary use of bandwidth, and the complete file will be buried by newer posts...
Better just create a new thread dedicated for this purpose. Someone will be responsible with the first page (which is the creator).
It may be of general interest in this thread - anyone making one of the larger amps, I have tested the Abletec 450w 53v SMPS with a class AB amp and it works very well. A nice PSU for $25 - can save some cash and weight for your next amp project.
http://www.diyaudio.com/forums/clas...ual-rail-450w-supply-20-a-12.html#post4732609
20mV ripple after passing output through a Dx PSU filter bank. It has 190mV ripple without the Dx PSU so the filter is needed to keep noise levels down.
If I used my newer CRCLC PSU, I think the ripple would probably be <5mV.
what amp is that and how does it stack up against fh9?
It's the VHEX+ and it also uses IRFP240/9240 like the FH9 but topology is completely different and it's twice as powerful as FH9. Can't really compare as they are like apples and oranges. The FH9 sounds just as good and has a similar MOSFET output quality at comparable power levels. The VHEX+ just has so much more dynamic headroom. It's a very nice design that uses SMT and through hole parts.
More info here:
http://www.diyaudio.com/forums/solid-state/286992-irfp240-9240-amplifier-simulated-tina-33.html
An Index to Apex Audio Amplifiers
Great idea Jay.
Here is the new thread:
http://www.diyaudio.com/forums/solid-state/292226-directory-apex-audio-amplifiers.html#post4733002
Great idea Jay.
Here is the new thread:
http://www.diyaudio.com/forums/solid-state/292226-directory-apex-audio-amplifiers.html#post4733002
I second this option. We don't really need the images in the post #1, just a list of designs, maybe short description and links. Like
FX8:
50watt, NPN differential input, complementary NPN/PNP VAS, lateral MOSFET output.
APEX FX8 post 2125, APEX layout post 6174
Prasi initial PCB layout post 6160, Prasi/Sonal edited layout post 6184
Bimo-mod version with simulation post 6483 using 2SC1845 input, 2SA1381/2SC3503 VAS, 2SK1058/2SJ162 output.
Prasi layout of bimo-mod post 7146
I hope Apex/Mile will consider editing the first post with some links for each design, but I understand it is a lot of work. Sorry I only have the information for the FX8 since that is the one I am building and studying, and I hope my understanding and description of the design is correct.
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It may be of general interest in this thread - anyone making one of the larger amps, I have tested the Abletec 450w 53v SMPS with a class AB amp and it works very well. A nice PSU for $25 - can save some cash and weight for your next amp project.
http://www.diyaudio.com/forums/clas...ual-rail-450w-supply-20-a-12.html#post4732609
20mV ripple after passing output through a Dx PSU filter bank. It has 190mV ripple without the Dx PSU so the filter is needed to keep noise levels down.
If I used my newer CRCLC PSU, I think the ripple would probably be <5mV.
I think you will all be interested in this development. I swapped over to the CRCLC PSU filter and the ripple at 51v with VHex+ amp is now 1mV! The speakers have never been this quiet before with no music playing. This is perhaps one of the highest value ultra low noise power supplies I have seen. SMPS is $25 on eBay and filter is maybe another $7.
A high value 50v class AB power supply that sounds great. Lighter weight than toroidal transformer too.
In thread http://www.diyaudio.com/forums/solid-state/162043-mosfet-amplifier-irfp240-irfp9240-47.html post #470 you can find nice and powerfull amp with IRF240/9240. and there is FX120 in thread http://www.diyaudio.com/forums/solid-state/162081-dc-servo-mosfet-amplifier.html ...
Regards