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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 17th July 2020, 12:57 AM   #251
kp93300 is offline kp93300  Malaysia
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Want to thank Mark for the pcb and the support. Nice calm and quiet amp that l like. Very detail and precise amp. Worth casing up
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Old 17th July 2020, 01:15 PM   #252
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
VERY nice build, kp93300! I'm happy to see that you added your own personal touch. SMD bypass capacitors, then beeswax(?) to fix the coil turns in place, rather than Kapton tape. Good on ya!
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Old 17th July 2020, 04:05 PM   #253
6L6 is offline 6L6  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Looks good!!

I’ve been having very good luck with MeanWell power supplies, how are those?
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Old 18th July 2020, 12:40 AM   #254
kp93300 is offline kp93300  Malaysia
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there is a little bit of buzz with ears right close to the markaudio 12 p speakers with the input shorted.
Otherwise, it sound very natural across the entire frequency range . BIG soundstage wll beyond the speakers and music surrounds you .
The amp and power supply generate almost no perceptible increase in temperature after many hrs of use.
I use AB epoxy resin glue to keep the inductor in place.
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Old 5th August 2020, 01:56 AM   #255
kp93300 is offline kp93300  Malaysia
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l replace mute resistor R17 with a combination of 22V zener diode in series with 22k resistor.
the switch on and off thump is removed but it sounds muffled and of low volume.
Is the problem due to the placement of C23 ?
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Old 5th August 2020, 02:04 AM   #256
Dadbeh is offline Dadbeh  United States
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Quote:
Originally Posted by kp93300 View Post
Want to thank Mark for the pcb and the support. Nice calm and quiet amp that l like. Very detail and precise amp. Worth casing up
what is the point of the caps on the speaker outputs?
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Old 5th August 2020, 03:35 AM   #257
asuslover is offline asuslover  Romania
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I believe that's the input cap and not the output, I guess they were a little large to fit on the board.
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Old 5th August 2020, 04:10 AM   #258
kp93300 is offline kp93300  Malaysia
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yes.
These are input caps for testing and trying . Not ideal but will solder on board once l made up my preference
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Old 21st August 2020, 06:58 PM   #259
bobberner is offline bobberner  United States
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Default First attempt at this

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.
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Old 21st August 2020, 07:12 PM   #260
Mooly is offline Mooly  United Kingdom
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Bob Cordell's Super Gain Clone PCB (LM3886) and a stripped-down version: Compact3886
Where to even start...



The ACA is a niche product that caters for those who want to go down the low power Class A single ended route. By that very definition the ACA runs hot, it has a low power output that is greatly affected by whatever you hang on the end of it but when all that is said and done it can sound truly wonderful and really engaging.

The LM3886 based design is, whichever way you flip it, a chip amp. That means cool running and efficient (compared to the Class A) and this one has an output that is not affected by what you dangle on the end of it. It has lower distortion, much better drive ability... but does it sound as good?

They will certainly sound very different one vs the other. Only you can decide which you prefer
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