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Chip Amps Amplifiers based on integrated circuits

LM3886 Layout ok?
LM3886 Layout ok?
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Old 27th September 2009, 05:05 PM   #11
Maxxtr0 is offline Maxxtr0  Germany
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Looks great! Thanks!
Iīll try to make a third version, kinda yours - if you allow me to?

And I still have to know, if the tracks for the zobel components have to be at least 2,54mm, too?
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Old 27th September 2009, 06:17 PM   #12
MJL21193 is offline MJL21193  Canada
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Quote:
Originally Posted by Maxxtr0 View Post
if the tracks for the zobel components have to be at least 2,54mm, too?
Good looking work

The Zobel will only see current when either the amp is oscillating (not good) or if it is reacting with the speakers inductance.
Track width to the Zobel can be narrow for normal uses.
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Old 27th September 2009, 06:36 PM   #13
Maxxtr0 is offline Maxxtr0  Germany
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Thanks for the info, MJL21193!

Iīve now almost "copied" your layout for my components, jaycee, but because of my 2200ĩF Caps it gets really a bit too big for me I think...
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Old 27th September 2009, 07:30 PM   #14
Maxxtr0 is offline Maxxtr0  Germany
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So here is my final layout an the schematic:

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Old 27th September 2009, 07:39 PM   #15
jaycee is offline jaycee  United Kingdom
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i've no problem with you basing the design on mine

Mine does not have the Zobel on board as previously mentioned. It has the L-C (thiele network?) in place, resistors R6 and R12 should have some 1mm diameter enamelled wire coiled around them as shown here. The zobel is across the speaker terminals (I used 10 ohms 1W + 100nF mylar "Greencap" type)
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Old 27th September 2009, 07:45 PM   #16
Maxxtr0 is offline Maxxtr0  Germany
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What does your resistor R6(R12) an the coil around it effect?
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Old 27th September 2009, 07:48 PM   #17
akis is offline akis  United Kingdom
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Quote:
Originally Posted by Maxxtr0 View Post
It can have itīs "sizeable" heatsink, even if the Boardīs that small
If thereīs no need to make it bigger - then why should I make it bigger? Of course making it that small makes it much more complicated - but thatīs why I am here, requesting your help
Because you can allow space on the PCB for the heatsink to sit on rather than hanging loose. Of course it all depends on the lay out, you may have a big metal plate you intend to mount everything on instead? Did I mention I used a fan at the end to keep things cool ? :-)
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Old 27th September 2009, 08:00 PM   #18
AndrewT is offline AndrewT  Scotland
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where is C3, C4 and Rf?
You must disconnect R2 and signal ground from the power ground.
It would be better if the Speaker ground and the Zobel ground were also disconnected from the power ground.

Rm will turn on the chipamp immediately the PSU voltage is above -9V.
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Old 27th September 2009, 08:42 PM   #19
Maxxtr0 is offline Maxxtr0  Germany
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@akis: I will mount the PCB onto the heatsink, not the heatsink onto the PCB I think So I thought it would be better to make the PCB as small as possible...

@AndrewT: The missing caps an Rf will get soldered directly to the correct pins.
Where should I connect R2 an Signal-Gnd to then?

@all: L-C-effect?
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Old 27th September 2009, 10:14 PM   #20
AndrewT is offline AndrewT  Scotland
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separate the dirty (power) from the audio grounds, separate the high current audio from the low current audio grounds.
Then connect them at a single point.

the L of the L//R can go in the route from PCB to output terminals.
The final R+C can go across the terminals.
The first R+C must be located very close to the chipamp, to minimise the L of the interconnecting traces.
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Last edited by AndrewT; 27th September 2009 at 10:17 PM.
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