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Old 8th September 2009, 11:43 AM   #1
pra3718 is offline pra3718  India
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Default LM3886, TDA2050 etc., P2P or PCB

My first build LM3886 p2p. Now I am planning to build tda2050 for surround sound & lm3886 for subwoofer for my home theatre. I wish to find out advantage/disadvantage for PCB and P2P. I found P2P building very easy for me. Gainclone has very minimum parts and can build with P2P design. And I think 1) Amplifier having minimum parts can be build with P2P design. 2) Amplifier having complex circuit (which is not possible with P2P) can be build with PCB. Is it right ?

1) How long P2P design can work/sound ?
2) P2p designed amp in chassis can carry or fear to connect wire each other.
3) P2p design keep components as short as possible. (Direct to pin)
4) No need to buy or design PCB.
Looking for more comments.

Thanks & Regards.
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Old 8th September 2009, 12:03 PM   #2
osscar is offline osscar  Latvia
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If the circuit is simple (few parts only) - i will go for p2p.
When I built my gainclone I had already ordered the pcb but not use them.
here is picture of my 3875 p2p.
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Old 8th September 2009, 12:04 PM   #3
ratza is offline ratza  Romania
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An answer for #1 would be "until you break it". The PCB mounting allows better stability (if you have kids, you know what I mean) and if it's designed properly it will work the same as P2P, if not better.
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Old 8th September 2009, 12:12 PM   #4
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Hi, Interesting timing that I just posted an update on my p2p LM3886 thread from four years ago. If you are thinking of doing an LM3886 P2P it might be worth a look Wintermute's Gainclone

I took the approach of making everything as close together as possible to minimise the effects of long wires (or traces in the case of a pcb). Made it extremely fiddly, and almost impossible to make any modifications after the fact, but certainly seems agreeable from a sound perspective

Tony.
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Old 8th September 2009, 01:28 PM   #5
pra3718 is offline pra3718  India
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Thank you, LM3886 is build. What about TDA2050 ? Is it possible P2P ?
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Old 8th September 2009, 06:34 PM   #6
ratza is offline ratza  Romania
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Of course you can. It's even easier than LM3886, since you have less components. BTW, how do you power it, single or split supply?
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Old 8th September 2009, 09:38 PM   #7
Zigis is offline Zigis  Latvia
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Quote:
Originally Posted by osscar View Post
here is picture of my 3875 p2p.
Hi osscar, still without power bypassing caps?

Zigis.
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Old 9th September 2009, 05:59 AM   #8
osscar is offline osscar  Latvia
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Hello Zigis !

I see no reason for them - my speakers have a better low-frequency response then highs and together with LM3875 sounds really clear and nice.And the distance from big RIFA filter cap to chip pin is some 5 cm +-.
Ive done the measurements with signal generator and 10ohm dummy load (30W approx). Input signal 0.3 and 0.5 V RMS (I can not use a larger signal due low wattage of dummy load)
Curve is almost smooth throughout the range from 20Hz-25 000 .
I will try to remeasure with bigger dummy load and larger input signal.

o.
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Old 9th September 2009, 02:53 PM   #9
pra3718 is offline pra3718  India
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If I go for P2P (tda2050) without power bypassing caps then what would be maximum distance between IC & power supply caps
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Old 9th September 2009, 03:03 PM   #10
AndrewT is offline AndrewT  Scotland
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<5mm?
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