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Old 17th July 2011, 10:26 AM   #91
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Default Not just simulations.

This is a working amp (X 14) ... (below is "ol' faithful") Silent/humless , no thump , LOUD as hell , very reliable.

Would not pass anything out to the forum that did not pass the "test".
Above Artwork WILL work.
OS
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Old 17th July 2011, 10:41 AM   #92
lineup is offline lineup  Sweden
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Ostripper
I am sure it will work well.
You put a lot of work into this project.
Remember, you were handpicked by the moderator group!
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Old 17th July 2011, 10:45 AM   #93
Variac is offline Variac  United States
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Quote:
Originally Posted by lineup View Post
Ostripper
I am sure it will work well.
You put a lot of work into this project.
Remember, you were handpicked by the moderator group!
Nah, Don't blame the moderators! It was just me...

Last edited by Variac; 17th July 2011 at 11:39 AM.
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Old 17th July 2011, 10:52 AM   #94
lineup is offline lineup  Sweden
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Okay, right is right, Variac.
Anyway it was a very good choice: Ostripper.
Credits.
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Old 17th July 2011, 12:12 PM   #95
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I think i know a decent heatsink that would suit this project, the MF30-1F-75 from conrad heatsinks, its cheap too!! Compared to other similar heatsinks from other manufs.
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Old 17th July 2011, 12:44 PM   #96
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Originally Posted by ostripper View Post
Hey , 5'th

Holy poop!! ... those are the outputs !!!!

I was quite pleased when I found them too. At the time they were really cheap as well £1.70 for one and £2.50 for the other. Now they've almost doubled in price, makes me wish I'd bought a few more!
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Old 17th July 2011, 07:40 PM   #97
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Originally Posted by 5th element View Post
I was quite pleased when I found them too. At the time they were really cheap as well £1.70 for one and £2.50 for the other. Now they've almost doubled in price, makes me wish I'd bought a few more!
I still see them for 3-4 USD at mouser/digikey , I will add them to the device listing which will be integrated with the BOM.

In the finished BOM will be the Caps , resistors ,diodes , and a wide selection of semi's ..... most I have actually tried in this amp.

A full self- contained LT spice simulation "package" will be available (below- attached) It is fine tuned to show pretty accurately what we are dealing with (nothing - THD wise, below). Make sure "DIYAamp.txt" is in the same folder as "DIYA-amp-LT.asc" (models are there).

- A "Options text" - This will explain all the mods that can be done.
1. - CMC or TMC , what to omit and what to jumper - what values work.

2. - FET or BJT - How to adjust the Cascode/ current mirror to use Jfets at input.

3 - Option for lead compensation and other component changes with a explanation of the advantages/disadvantages.

4 - Advice for single sided Toner transfer construction , this board is backwards compatible for FULL DIY. I'm sure the Board Store will be reasonable, so this might just be for prototyping.

I "Branded" the PCB as requested by Mark , I want to REALLY fine tune and debug the layout for 0 errors , even down to the aesthetics of the PCB.. before I submit Gerbers (No GOLDMUND mess-ups).

An article on this amp/topology would be forthcoming (Help ... Mark , I'm no editor). Any final comments or suggestions for documentation or parts selection is welcome.

OS
Attached Images
File Type: jpg DIYA_classAB_schematic.jpg (246.4 KB, 1504 views)
File Type: gif excellent.gif (25.4 KB, 1352 views)
File Type: gif final-DIYA-ax-overview.GIF (68.3 KB, 1278 views)
Attached Files
File Type: zip DIYA-amp-LT.zip (15.7 KB, 267 views)
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Last edited by ostripper; 17th July 2011 at 07:59 PM.
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Old 18th July 2011, 03:33 AM   #98
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Quote:
Originally Posted by ostripper View Post
MJ is to-3 (this one needs to-247/to-3p) , 21193/4 is too low Hfe for a EF2. My triple (DBT-luxman) is the beast for the to-3p/to-247 21193/4's.

LIST of outputs ....

For the full 150w
NJW0281/0302
MJL4281/4302
2SA1943/2SC5200



Sanken to-3p's (below 1) quite a selection ... any below would work.
150w (marginally)


Drivers -
MJE15030/31 or 32/33 or 34/35 - optimum ON- semi
2sa1837/2sc4793 - best for 8R use , EF2 would have the most total Hfe .

I've tried most of these devices , so I should document all these choices and include them in the book.


OS

What I have are the MJL flat packs, which I think are designated TO-264. Though I believe that I also have some in my stash the 3281/1302 and 5200/1943 pairs.
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Old 18th July 2011, 02:23 PM   #99
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I also have the same flat packs (3281/1302) sitting here from a swap meet. Would be cool to use these OPS transistors in this project.

Variac and Ostripper, great idea. Very excited to try this!!
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Old 18th July 2011, 06:58 PM   #100
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Default PCB with OT in line

...... another PCB with OT in line
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File Type: jpg DIYLIN OSTRRIPER.jpg (519.3 KB, 1284 views)
Attached Files
File Type: pdf DIY LIN OS.pdf (174.5 KB, 542 views)

Last edited by alex mm; 18th July 2011 at 07:12 PM.
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