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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 21st August 2020, 07:16 PM   #261
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 honestly like both.
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Old 21st August 2020, 08:19 PM   #262
CharlieLaub is offline CharlieLaub  United States
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Quote:
Originally Posted by bobberner View Post
Hello all!

I just received my parts for the Super Gain Clone and PS, well except for the chassis and some out of stock caps on the way from digikey. If I may ask a very basic question, what is the difference between this and the Amp Camp amplifier. Other than the internal PS, 40 watts vs 8 watts, and number of parts involved? The price seems to be about the same, well at least the same order of magnitude anyway.
This is like asking what is the difference between a Dodge Hellcat and Ford F-250. Both have four wheels and engines and lots of parts. Completely different types of vehicles, though.

The Amp Camp amp and and a good LM3886 amp are completely different types of amplifiers with different performance goals and implementations. They are as similar as apples and oranges, even though they are still both "amplifiers".
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Old 23rd August 2020, 10:32 PM   #263
bobberner is offline bobberner  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Thanks for the replies so far. If you haven't guessed I am still very new to the hobby. I was really asking what the difference is in the fundamental design of the amplifiers. After doing some more research and asking a colleague, it seems like the fundamental difference is that the gainclone is digital and the Amp Camp is analog. Both are solid state. Is that a correct assumption?
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Old 23rd August 2020, 10:47 PM   #264
6L6 is offline 6L6  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Digital? Neither.

Gainclone is an integrated circuit Class-AB Push-pull analog amplifier.

ACA is A discreet Class-A single-ended analog amplifier.
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Old 23rd August 2020, 10:53 PM   #265
asuslover is offline asuslover  Romania
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I have 2 of "stripped-down version: Compact3886 "boards I don't think I will ever use.
Gabe
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Old 23rd August 2020, 10:56 PM   #266
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
bobberner, your colleague got one thing right: neither the Cordell Super Gainclone, nor the Amp Camp Amp, includes vacuum tubes. Not a single tube in either one.

The heart of the Amp Camp Amp is component #1

whereas

The heart of the Cordell Super Gainclone is component #2

Why don't you forward those links to your colleague, and ask her/him to look them over? Maybe a light bulb of sudden understanding will illuminate... ? You might find it easier to trust the opinion of a colleague rather than a bunch of relative strangers on a website.

_

Last edited by Mark Johnson; 23rd August 2020 at 10:59 PM.
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Old 24th August 2020, 12:19 AM   #267
Variac is offline Variac  Costa Rica
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
It would seem to be a great project to build both then report back.I’ll bet you could discern the differences, which would be fun IMHO. Also I’ll bet you would find a use for each.
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Old 24th August 2020, 12:58 AM   #268
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
Readers,

Member bobberner PM'd me on March 13th to ask whether this set of PCBs might make a good project for a class he teaches at a community college in the Eastern time zone of the US. Then he asked for roughly comparable amps available in kit form (letting someone else do the miserable grunt work of sourcing components). I replied by PM

Quote:
Bob, the closest comparable kit is the (very excellent) Akitika GT102. For $314 you get two amp channel PCBs, one PSU PCB, two heatsinks, a pre-drilled chassis, all electronic parts, a power cord, a lighted ON/OFF switch on the front panel, and no requirement to spend hours and hours of your time ordering individual components from Mouser. Or finding substitutes for out-of-stock parts.

GT-102 Stereo Power Amplifier .
Now that ACA is available in kit form it might, or might not, be considered a "comparable" amplifier.

-- Mark Johnson (thread starter)
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Old 24th August 2020, 05:20 AM   #269
Tibouchina is offline Tibouchina  Australia
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Default How about these?

Weird, you can't use google?


For some theory:


Taming the LM3886 Chip Amplifier – Neurochrome


A Complete Guide to Design and Build a Hi-Fi LM3886 Amplifier - Circuit Basics


High quality PCBs:


LM3886 Done Right: Best DIY implementation of the LM3886 80W gainclone – Neurochrome


LM3886 Amplifier -
EasyEDA



There are others. Just search the forum.


Lower Cost Alternatives:


Any of the LM3886 amp kits on Alibaba will be to be more than adequate. Could be a good exercise for the students to verify the kit contents before they start construction.


You could even get different groups to try separate kits and then report back on their experiences.
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Old 24th August 2020, 06:16 AM   #270
myleftear is offline myleftear  Switzerland
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
I had similar misconceptions about the differences between ACA and gain-clones (aka _chip_-amps). A chip is usually connotated as being a digital device...
Well.
For the sake of the art, I wouldn’t recommend any cheapo out-of-anywhere gainclones, but try to stick to valuable designs from the hands of respected masters, like Nelson Pass or Mark Johnson.
Thus, you can be confident the concepts are thought through and are free of flaws...

The documents referred above are state of the art, too. They require a lot of attention!
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