5 + 2 (bridge) channel gainclone

[pra3718]

I am planning to build 5 channel + 2 channel bridge with power supply on single PCB. Please post any PCB with clear & big picture. Building single gainclone is very easy but multiple gainclone is complex.

My first try would be TDA2030 because it is cheap IC. Then 2050 & 3886.

Specially, I am worried about wiring management RC GROUND, POWER GROUND etc.,

Regards.

[Maxxtr0]

You want ALL of that on one single PCB, am I right? Are you going to Design the PCBs by yourself?
If yes, you could habe a look hat my thread in which you can learn much about grounding I think: LM3886 Layout ok?

[pacificblue]

There are a bunch of threads about grounding already. The Search function will turn them all up.

[gfiandy]

You are right this is extreemly complex to maintain a unconditionally stable desing. I found it possible to share the power supply rails with good decoupling local to the amps. However a seperate ground return from each of the speaker loads was required to the bulk decoupling capacitor star point and this had to be kept close to the power output track to the speaker. An output inductor bypassed with a 10R resistor was required to isolate the amplifers from capacitance in the cables and a Zobel network with a seperate ground return required for each amplifer. It required a 4 layer PCB to achieve this in a small space for a comercial design. You may be able to do it on a two layer PCB if you are preapred to use lots of space. Best of luck Andrew

[pra3718]

Thanks

@Maxxtr0 : Your LM3886 layout is good and usefull. I have already tried 5 mono amp. It's sound good individually or stereo configuration.

@gfiandy : Thousand words v/s single picture. I found thread "Giga Amp 5.1 channel" by myanmar (please find attached picture) is good but not very clear. Exactly I need this but require big and clear picture to understand. Yet, your post # 4 is usefull to me.

Thank you

[pacificblue]

Did you try to PM myanmar?

[pra3718]

@pacificblue : Yes, but no reply

[pra3718]

At last, I build 6 channel on single PCB with TDA2030 it was my dream. Good bass and good loudness but not sufficient. Everything is fine but MID & HIGH frequencies are not good. I like MID-HIGH frequencies soft & delicate. Bass should be soft but strong.

Overall ambience, quality sound. Sorry I can not describe but can you improve my schematic ?

Zobel does not make any good difference to me. But if you advise I can add.

Thank you
Regards.

[gfiandy]

Hi, You could try fiddling arround with the supply decoupling but to be honist I suspect the problem is the chip amps. The TDA2030 is a fine low cost audio amp, but if you want something that is a bit better I would try the LM1875. The circuit is very similar however its performance is much better.

If you want some advice on the layout we will need to see both sides of the PCB. However it looks like you have daisy chained the supplies and ground. If this is the case then a star arrangement will probably sound better.

Regards,
Andrew

[pra3718]

@gfiandy

Thank you.

Attached picture may help you to advise good layout. In my first attached picture you may find 1R+0.1uf with this sound improved little.

Today, I found that Diode (6Amp) becomes very hot. What is the reason ? But still I listen the Amp for 1 hour I did not find any problem with system & it's sound.

Another major thing is ON/OFF power switching noise. When I tried mono amp it was not.

Please find attached picture for layout.

Thanks & Regards.