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Old 10th April 2014, 11:18 PM   #3131
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Originally Posted by keantoken View Post
That was long before I had tweaked the best version out. You can keep it simple if you're designing for a specific application, once you know what things make the circuit as good as it is.
Yes, I see many different versions.

I wouldn't want to use TO220 parts, at the most TO126, but I don't even think it's necessary for what I use them for, as it's only for the front ends of amps that need 20-30mA, rarely more.

I'll do some testing with what you have on your page. But I'll be looking for smaller transistors than TO220 cases.

For the smaller one, perhaps the mpsa18 is a good one, however if I remember right, that one doesn't have a complementary, so that would make the negative side different because of using a different one.
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Old 10th April 2014, 11:30 PM   #3132
kouiky is offline kouiky  United States
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Originally Posted by spookydd View Post
It's the apex ax11. As is. Hardly changed, except for the different models because I couldn't get the exact ones called on by the schematic and also I added a resistor in the bias spreader to reduce the idle as it is high with the values on the schematic.

One added difference lately is to lower the miller caps from 330p to 33p, which changes things a lot, as the sine wave was ugly at 20khz.
OK, thank you for the reply. I didn't do a very good job at clarifying what I was referring to, but what I meant was that the first Apex schematics in this thread look like they were pulled right from an early MX series Yamaha amplifier. The resemblence is so pronounced, that it's uncanny. In fact, with the exception of some obvious errors in Apex's drawing and the choice of alternate devices, they are the same. What struck me was that the patent for that particular discrete transconductance driver arrangment was owned by Yamaha in the 70's through the 90's. I'm surprised others hadn't taken notice of this, as some of the Japanese company's designs have been cloned by other makers over the years.

Last edited by kouiky; 10th April 2014 at 11:47 PM.
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Old 11th April 2014, 12:36 PM   #3133
Vostro is offline Vostro  South Africa
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Hi kouiky, have you read the whole thread,
The ax14 is similar to Yamaha AX series,
This has been mentioned many times.
But thanks to Apexaudio the rather nice yamaha amp has
Been made DIY for the community.
I have built the AX14 not the AX11 yet and I'm very happy with it.
Regards
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Old 12th April 2014, 12:46 AM   #3134
kouiky is offline kouiky  United States
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The thread is pretty long, so I didn't go page for page. What happened was I browsing and the design popped out like a hammered thumb as one of a kind. I immidiately yanked the early patent, and there it was. Looks like I guessed right. Some of the AX series share similar topologies to the MX separates, and that driver stage was unmistakable as the early Yamaha patented SEPP driver stage. I was aware it had been cloned and used in some higher end amps from some...ahem certain designers. I'm surprised that Apex also used it because it's off the radar, despite being a fantastic design.

Last edited by kouiky; 12th April 2014 at 01:03 AM.
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Old 12th April 2014, 06:05 AM   #3135
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It is absolutely necessary someone, (Apex) posting all these AX-XXX series with all updates again.
Thread is so long with many updates.
Is Not possible someone see all these updates around AX-XXX.
Thimios.
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Old 12th April 2014, 02:36 PM   #3136
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Hello guys

Has some one already build this layout from mister Alex MM ?

Regards
Juan
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Old 20th April 2014, 06:49 PM   #3137
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hello apex sir Which amp can drive 250watts 4ohm heavy subwoofer


i have made 5@ LM3886 and searching for subwoofer amplifier to drive my hi power 12'' subwoofer
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Old 20th April 2014, 07:08 PM   #3138
44250 is offline 44250  Serbia
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Quote:
Originally Posted by shravanth View Post
hello apex sir Which amp can drive 250watts 4ohm heavy subwoofer


i have made 5@ LM3886 and searching for subwoofer amplifier to drive my hi power 12'' subwoofer

APEX HV23 or APEX HV350,easy and with a lot of reserve power!
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Old 20th April 2014, 07:15 PM   #3139
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APEX HV23 or APEX HV350,easy and with a lot of reserve power!
Tq u for your suggestions sir can u give circuit, pcb and testing files
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Old 20th April 2014, 08:08 PM   #3140
cook77 is offline cook77  Romania
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Has some one already build this layout from mister Alex MM ?


I use this PCB. Now I'm listening to it and I'm pleased of what I hear. It works fine , even if it has no dc servo. Sound is real good for me. Much better then my english...
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