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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 14th January 2020, 12:33 AM   #91
kp93300 is offline kp93300  Malaysia
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Mark,
thank you for the reply.
I have the pcb in hand.
i will go ahead and solder 1206 smd X7R capacitors next to the DIP sockets for bypass.
I am trying to use up old stocks of parts to make way for more new projects.
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Old 14th January 2020, 01:56 AM   #92
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
Sure, give it a try! You may want to also build an experimental control using the film (not ceramic X7R) capacitors called for in the Detailed Parts List. Just to find out whether there are, or are not, "any audible differences". Have fun!
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Old 14th January 2020, 03:33 AM   #93
asuslover is offline asuslover  Romania
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This is how far I got with only in the house components.
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Old 14th January 2020, 06:06 AM   #94
jimk04 is offline jimk04  United Kingdom
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Are the boards shipping then?
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Old 14th January 2020, 06:09 AM   #95
asuslover is offline asuslover  Romania
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I got these boards from Mark before the groupbuy.
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Old 14th January 2020, 06:29 AM   #96
jimk04 is offline jimk04  United Kingdom
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Ah I see thankyou
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Old 14th January 2020, 01:13 PM   #97
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
In November I sold (at my cost) the excess boards I hadn't used myself, from the initial prototyping run at the PCB fab. There weren't a lot of PCBs; all were gone after only eleven orders.

Then in December I launched a Group Buy, for much greater quantities. This time there were many more buyers, and everyone got a nice volume discount. The orders have been placed, the money has been collected, and now we're waiting for the GB boards to ship from China to California.
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Old 15th January 2020, 01:05 AM   #98
kp93300 is offline kp93300  Malaysia
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value of C23, mute pin capacitor

l notice that the datasheet application circuit uses 100 uf instead of 10 uf in the supergainclone circuit .

i am learning electronic and in this circuit if l use 100uf, there will be a switch off thump on powering off because the power supply to the DIP op amp collapsed earlier .

Am l correct with the reasoning?
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Old 15th January 2020, 01:28 AM   #99
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
Bob Cordell's design is shown in post #9. It has ten microfarads on the LM3886 MUTE pin. The schematic for this Super Gain Clone PCB (in post #1) also has ten microfarads on the LM3886 MUTE pin. I recommend that you connect ten microfarads to the MUTE pin.

Despite this recommendation, if you still want to experiment, please go right ahead! It's okay to deviate from the recommended values, as long as you remember you are taking a risk. In snow skiing it's called "off piste" -- you have chosen to ski where there is no marked trail -- and if you fall down & get hurt, nobody will find your dead frozen body for several days. This is D.I.Y. after all, emphasis on the Y. Do what You want to do and have some fun! Play with whatever "knobs" you like.

There are other, non-Bob-Cordell designs for LM3886 boards "out there" which install a Zener diode in the mute circuit, supposedly for extra margin of safety. (Bob's Super Gain Clone design has no Zener diode in the mute circuit). An early, early builder of this PCB has deviated from the official schematic and installed a Zener diode (not on the schematic!) in her/his Mute circuit of her/his board. I understand that s/he is happy with the result.
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Old 17th January 2020, 10:31 PM   #100
Dadbeh is online now Dadbeh  United States
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where is R18 on the PCB?
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