LM3886 Schematics + PCB

[prasi]

Any comments please?
Reg
Prasi

 

[prasi]

Very small PCB based on Yorkville Amps.

Dear Mr. Apex,

what would be the effect of replacement C1(220nF) by 1uF? C1 if I am not mistaken, is too low a valueand will degrade low frequency performance. TI recommends 10uF coupling capacitor.

regards
prasi

 

[prasi]

Dear Mr. Apex,

what would be the effect of replacement C1(220nF) by 1uF? C1 if I am not mistaken, is too low a valueand will degrade low frequency performance. TI recommends 10uF coupling capacitor.

regards
prasi

Is this thread dead? Nobody appears to reply to it any more.
Reg
Prasi

 

[udailey]

He could be sleeping or at work. He replies. However you can use any larger size you like. 10uf or even 1uf would be fine.

 

[prasi]

He could be sleeping or at work. He replies. However you can use any larger size you like. 10uf or even 1uf would be fine.

Hi udailey.. thanks for ur reply. What I would like to understand is that whether a larger value of capacitor would improve low frequency response. Also any other way to boost bass 20-70 hz.
Regards
Praai

 

[udailey]

Yes. Larger values allow lower frequency -3db points. The bipolar cap in the feedback loop that goes to ground is important in this situation as well. Read lm3886 datasheet and it shows the formula for figuring out the right values for lower frequencies.

 

[smithy468]

I'm planning on building this circuit and ordering parts from Mouser but the cost is adding up quickly! Could someone let me know if this parts list is overkill, and if I could save money by using lower quality components anywhere? The component numbers are in reference to the schematic on page 1, but also include the upgrades mentioned by others in this thread.

Basically I've used metal film resistors and the highest quality polypropylene and electrolytic caps I could find where ever possible, but I expect some components don't affect the sound quality (C5, R5, C6, C7, R2, R3, R4 ??)

Here's the BOM on Google Docs:

https://docs.google.com/spreadsheets/d/1NIjnpftJUmgYAPfuft6lqWV128HQln37YLxrXch4qHY/edit?usp=sharing

 

[apexaudio]

APEX Super Gainclone

 

[asuslover]

Inverting Servo Amplifier Schematic!
I would like to try this.
Any pcb version available?

 

[bender460]

A pcb layout would be awesome.

 

[prasi]

APEX Super Gainclone

Mr. Mile Here is the layout for Super Gainclone. Is it ok?

regards
Prasi

 

[apexaudio]

Mr. Mile Here is the layout for Super Gainclone. Is it ok?

regards
Prasi

Nice work but one connection missing.
Regards

 

[prasi]

Nice work but one connection missing.
Regards

Corrected, also had to increase the size a bit for 13mm caps for C7 and C13. Earlier I had 10mm dia capacitors.

regards
Prasi

 

[apexaudio]

Corrected, also had to increase the size a bit for 13mm caps for C7 and C13. Earlier I had 10mm dia capacitors.

regards
Prasi

One more correction, 56R in series with regulators.

 

[prasi]

One more correction, 56R in series with regulators.

Mr.Mile,
added 56R resistors on regs and also managed to loose one jumper. is it perfect now?

reg
Prasi

 

[apexaudio]

Mr.Mile,
added 56R resistors on regs and also managed to loose one jumper. is it perfect now?

reg
Prasi

Yes it is perfect, thank you.
Regards

 

[prasi]

Yes it is perfect, thank you.
Regards

Thanks Mr. Mile.

Here are the schematic, stuffing guide, pdf's and gerbers for anyone willing to try.
reg
Prasi

 

[leadbelly]

Thanks Mr. Mile.

Here are the stuffing guide, pdf's and gerbers for anyone willing to try.
reg
Prasi

Fantastic! Thanks!

 

[asuslover]

Thank you Prasi! You are a good friend!
Gabriel

 

[prasi]

you are most welcome Gabriel and leadbelly.
reg
Prasi