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Chip Amps Amplifiers based on integrated circuits

Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
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Old 9th March 2020, 09:50 PM   #171
legis31 is offline legis31  United States
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Thanks Mark. I had a suspicion the pot would interact with the other input components
but wanted to better understand the situation (plus I had a couple of 50K Alps pots on hand..). Is there a specific value for the SGC you'd recommend?
I use a volume pot on my amps because my experience tells me there may always be a situation where I need to drop the volume in a hurry and also because I've given amps as graduation gifts and as such I can't control what gets used as a source.
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Old 9th March 2020, 09:56 PM   #172
6L6 is offline 6L6  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Pot resistance has mostly to do with your sources rather than what’s downstream of it... if you don’t have any tube sources then 10K or 25k is great, if you have tube components you should think of having 100k or more.

50k is a great compromise value and if you have it, use it.
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Old 9th March 2020, 11:09 PM   #173
legis31 is offline legis31  United States
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Thanks 6L6. Much obliged!
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Old 5th April 2020, 04:33 AM   #174
6L6 is offline 6L6  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
I striped out a different project from my test chassis and hooked up the compact 3886 (with a slightly earlier revision PSU.) It is quiet, works and sounds fantastic, even with the less than optimal wiring and layout that used a lot of preexisting holes.

I'm very pleased.

Anybody else have one built? I'm going to build up the super gain clone as well as the compact and have them in much better looking chassis than this one.
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Old 5th April 2020, 04:39 AM   #175
timgrindell is offline timgrindell  New Zealand
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Good on ya 6
Looks like just you and me (and Mark) have completed them.
best
t
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Old 5th April 2020, 05:50 AM   #176
454Casull is offline 454Casull  Canada
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Quote:
Originally Posted by pfarrell View Post
Perfect activity for a Sunday.

Thanks Mark!!!!
That is one heck of a lightbox you've got there. It's so bright, it's even hurting my eyes through my monitor.
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Old 5th April 2020, 12:58 PM   #177
pfarrell is offline pfarrell  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Boards are made for full version.. have a transformer and all the bits... now need a chassis solution... Workin on it! Looks great 6L6!.... ooooh “test chassis”... I love this concept.
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Old 11th April 2020, 11:30 PM   #178
pfarrell is offline pfarrell  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
In the spirit of "use what you have" I found these 4.75 x 8" sinks that I must have ordered as extra at some point (also IEC from Whammy kit!)... Seems like they will be perfect for making a tidy amp about 14.5" wide—the donut in the pic IS the recommended Antek—but it's too tall for 4.75" tall chassis so I sourced a 150VA 2x22 that will fit the chassis on an L bracket. Top, bottom and back will be 3mm sheet aluminum—I'll add some holes for airflow—maybe even have them CNCd... front will be wood based... Not sure yet of look....

And I need to buckle down and figure out how to set the Klever Klipper! One of the many reasons I wanted to build this—more learning!

Also making good use of the the L brackets from the BOM!

Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886-cordell-progress_01-jpg
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Last edited by 6L6; 11th April 2020 at 11:36 PM.
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Old 12th April 2020, 01:49 AM   #179
Mark Johnson is offline Mark Johnson  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Wow! Is that a bowed rear panel?? That's cool upon cool. And an option for a wooden front panel... awesome!!

Buy a bunch of those Keystone "4336" L-brackets, they will be handy to have around, nestled in your parts drawer, waiting for an application
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Old 12th April 2020, 02:01 AM   #180
pfarrell is offline pfarrell  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
I bought a whole bunch. Handy for mounting front panels w/o through bolts. Back panel is a paper mockup!! Working out layout. It will mount to tapped ends of the bars.
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