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Old 14th August 2016, 07:17 AM   #1
xrk971 is online now xrk971  United States
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Default A Directory of Apex Audio Amplifiers - Chapter 2

This thread is an extension of the main Directory located here:

A Directory of Apex Audio Amplifiers

Another thread was needed since a post is limited to a max of 50 images. Since I felt that it is important to visually be able to see the schematic of an amplifier design in the index, and Apex Audio is so prolific with his designs, we ran out of room on the main thread. I will try to alphabetize/categorize to the extent possible, but may have to resort to serial ordering of when I discover it if I don't have time to maintain.

We will start this thread off with the

Retro Amp 50W Single Supply - added Aug. 14, 2016:
Click the image to open in full size.

Retro Amp 50W Single Supply

Build by Olafk:
Retro Amp 50W Single Supply

Listening impression by Olafk:
Quote:
Very nice little amplifier .
Built and work. Nice warm sound.
PCB pdf's by Olafk:
Retro Amp 50W Single Supply

Video of this amp in action (speakers sound a bit tinny so probably not fault of amp):
https://www.youtube.com/watch?v=gFbivge6oVY

*****

F8 (diamond buffer front end latFET outputs) - added Aug 14, 2016:
Click the image to open in full size.

PCB layout:
100W Ultimate Fidelity Amplifier

No confirmed builds as of 8/14/2016.

*****

FR100 - added Aug 16, 2016, new design not tested as of this date:
Click the image to open in full size.

Studio Reference Amplifier

Nice layout by Prasi:

Studio Reference Amplifier

*****

A3 - added Aug. 19, 2016:
Click the image to open in full size.

100W Ultimate Fidelity Amplifier

PCB:
100W Ultimate Fidelity Amplifier

First build here:
100W Ultimate Fidelity Amplifier

Preamp - added Sept 4 2016:
Click the image to open in full size.

DC crowbar speaker protect (powered by speaker cable so can be placed in speaker itself) - Sept 22, 2016:

Click the image to open in full size.

P30ZF Zero negative feedback preamp - added Oct 7, 2016:
100W Ultimate Fidelity Amplifier

Click the image to open in full size.

Last edited by xrk971; 7th October 2016 at 01:54 PM.
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Old 14th August 2016, 01:18 PM   #2
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Post Making "place holders" on #11, #21 posts...

Hi xrk971,

Maybe you can also make post #11 (first post on 2nd page) as a "place holder" for another 50 images on 2nd page in this same thread if it works.
Should be good/enough for a while, but as Apex goes on highly productive, then post #21 (first post on 3rd page) as another "place holder" for another 50 images, and so on...


Last edited by Karl vd Berg; 14th August 2016 at 01:28 PM.
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Old 17th August 2016, 04:32 AM   #3
xrk971 is online now xrk971  United States
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Added FR100 from here:
Studio Reference Amplifier
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Old 4th September 2016, 09:46 PM   #4
xrk971 is online now xrk971  United States
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SR PP12 preamp added. Can be headphone amp too.
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Old 22nd September 2016, 04:32 PM   #5
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Default DC Crowbar Speaker Protect (passive)

Circuit will be activated with DC over +/-10V - then will blow fuse at amp to protect speaker which is shorted at terminals.

Studio Reference Amplifier

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Old 7th October 2016, 01:54 PM   #6
xrk971 is online now xrk971  United States
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Just added Zero Negative Feedback preamp:
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