| smarbaga |
hello
i have 2 LM3886T chips to build a mono block. ( 8 ohms)
i have read 100's maybe 1000 threads in search of a solid
design.
Now i am swamped, overwelmed and totally confused.
Would anyone out there have a short summary of the
different designes and there pro's and cons.
or I like ( dislikr) this because .....!@#$%^&*()
I really want to get building,
but now there are so many avenues.
looking for a basic, good, solid schematic, design.
i have used orcad to lay out pcb's for 25 years.
if the system meets simplicity, solidness and easily
available parts, perhaps i will get some good pdb's
made and offer them ( bare and kits )
one step at a time.
ps: thanks for your help ( in advacne ) garry |
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| ttan98 |
For those who post here to outline the pros and cons for all the designs out there is big task besides the voluminous amount of words that needed to be written.
Most of the designs out there are very similar the main difference are in the power supply and choice of types of components.
I am building one (I have surfed many sites as well), I am wiring point to point and using minimum no of components necessary. My suggestion to you is simply pick one design eg one from chipamp website and if you don't want to wire pt-to-pt.
On completion and after you have listened to it, tweaking is essential to suit your system. If you don't know how you can put your difficulties here most people here will help you.
cheers |
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| Crazy-Stereo |
| since the very little amout of components, pcb is not the trouble to be built. I once built the 2-channel pt-to-pt soldering LM3876TF, a one-day project and it sounds good for me but it seems to be untidy look, so lastly i design 2 pcbs for my LM3876. |
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| AndrewT |
Hi,
option 1.
inverting or non-inverting
option 2.
smoothing capacitance or zero smoothing capacitance
option 3.
single or parallel
option 4.
one chip or 4602 (with off chip drivers and outputs)
option 5.
bridged or discrete
The combinations are enormous and I doubt anyone has built more than 6 permutations. |
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| Fenris |
| Start with the recommended design in the National datasheet. A non-inverting design is simple and straightforward. If you want to experiment later, design a PCB with room so that you can put in different size components, parallel components (i.e. a small value cap in parallel with the feedback resistor to limit gain at high frequencies), etc. Russ White and I (and lots of others) have small (40mm x 45mm) single sided PCB designs, or you could P2P wire it. There are so many variations and unknowns (type of speaker, source impedance, room modes, etc) that a single "best" soloution doesn't exist. |
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| smarbaga |
i sure see several designs,
i kind of like to looks and the theory behind the symetrical design.
my real application is to replace the output stage of my KUSTOM guitar amp with a pair of these LM3886T's i have just purchaced.
this is a solid state preamp with +/- 35 vdc.
i have no problem with regulating the psu.
maybe i should just replace the output transistors of the guitar amp.
but then i will stll have the 3886 chips taunting me. :-( :-) |
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| Minion |
I suggest that you simply use the Datasheet Schematics for the Type of amp you want to build (Mono,Bridged,Paralell).....
In a Guitar amp you probably won"t really notice the Different sounds from useing different Components as Guitar amps are pretty Noisy by design anyways.....
I use a LM3886 In my DIY Guitar amp and it sounds very good and puts out about 50w and I just used the Datasheet Schematic and designed my own PCB....I have just finnished Building all the Parts for a 100w Bass amp useing 2 LM3886 in Bridged/Paralell mode and just have to Put them together and Find a Chassis and Speaker......
Cheers |
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| smarbaga |
thank you all for your reply's and information.
i am always open to sugestions. |
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