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Old 19th March 2015, 01:54 PM   #11
Zen Mod is offline Zen Mod  Serbia
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Accu - shortie for Accumulator

ya know these things you're having in APC under your PC table and bed and even in airborne gadgets ......

just another thing - if reason for using OP as gain device is making Volksamp , why not using plain dirt IRFs on output , as main choice ?

I believe - majority of Greedy Boyz will rather choose slightly bigger PSU and heatsinks than fleabay hassle for Toshibas .......

only if you boyz intend to sell them through Store , as part of package
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Last edited by Zen Mod; 19th March 2015 at 01:57 PM.
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Old 19th March 2015, 02:48 PM   #12
6L6 is offline 6L6  United States
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As you know, due to massive piles of the things in the secret Pass Labs vault and warehouse, Nelson and Wayne can only think in Toshiba.

This is not an issue, as the output stage works beautifully with Fairchild and IRF.

Because I have a bunch in my coffee can, the first prototype I build will use Fairchild FQP3N30/FQP3P20, Mouser has thousands in stock, for less than $1 each.
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Old 19th March 2015, 05:27 PM   #13
ammel68 is offline ammel68  United States
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Back to my original question from post 3...is the 2604 op-amp a gain stage or a servo as Zen suggested??

Edit--I see where 6L6 stated that it is for gain in post 10.

Last edited by ammel68; 19th March 2015 at 05:30 PM.
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Old 19th March 2015, 05:29 PM   #14
6L6 is offline 6L6  United States
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Gain.
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Old 19th March 2015, 05:39 PM   #15
ammel68 is offline ammel68  United States
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6L6, do you have part numbers for the Hammond enclosure you're using and the power transformer?

Does this use coupling caps on the outputs like the BA-3?

Thanks...
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Old 19th March 2015, 05:55 PM   #16
6L6 is offline 6L6  United States
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The case is Hammond 1455T2201 -- There are many different colors and options available in that same dimension. Metal or Plastic end panels, silver, blue, red, black, etc...

The transformer is the Amveco 70063K or Talema 70063K -- but it's a flexible design and you are not stuck with those specific part numbers. (Although it will need to have the same dimension and pinout if you want to PCB mount it.)

No caps on the output. It's DC coupled, something that the precision of the opamp is primarily responsible for.

Don't worry too much about parts and part numbers and such as yet... This is the prototype, and the version when released will have both a full article (in PassDIY style) and build guide (in diyAudio style). Also an annotated BOM which plenty of choices and substitutions for parts depending on your supplier.
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Old 19th March 2015, 06:29 PM   #17
MASantos is offline MASantos  Portugal
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I'm sure that many details are different, but it has some resemblance with the M3 from AMB.org .
Opamp input with mosfet output stage. I like the all in one pcb design!

I't would have been great to have a better power supply regulator, such as the super reg from the shop in the pcb, but that would increase the PCB area and complexity I know.

And why not a discrete input stage? The lsk trannies will be sold as matched pairs so the "where can I buy matched devices" problem is solved.
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Old 19th March 2015, 06:53 PM   #18
EUVL is offline EUVL  Europe
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You can use a discrete JFET opamp.
Then it will be all discrete.


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Old 19th March 2015, 09:38 PM   #19
MASantos is offline MASantos  Portugal
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Ok, but designing a discrete amplifier from the ground up is different from throwing a discrete opamp in a design.
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Old 19th March 2015, 10:01 PM   #20
blizzardbuffalo is offline blizzardbuffalo  Australia
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Is it designed in such a way that it can be built with a balanced in/out option?
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