However, after I studied his schematics for a while, I decided to go a different direction.
Many people on the forums have been building these amps with the boards available from Audio Sector. (At least the top dog of a class AB chip amp design ) Certainly nothing to sneeze at, and this should be about the top-dog of a chip amp design. This should give me somewhere in the neighborhood of 100 Wrms per channel. I have decided to go with a LM4780 chip in parallel configuration, 1 chip in parallel for each channel. Well, after a couple more weeks of reading, studying, and asking questions, here's the plan! This guy did some amazing LM4780 builds! But dang, those cases probably cost at least 3x all the other parts combined! If I were to cut the P/S to 220VA and scavenge, build, or get a cheaper case, then I could probably shave $100 off the price! That is not bad at all! Just about top-of-the-line chip amp, with over-spec'd transformer and P/S filter caps, and over-spec heat sinking too! Probably much more than needed for this build.
#LM4766 VS LM3886 MOD#
I will most likely piggy-back mod circuits onto perf-boards and then connected to the purchased PCBs. However, I will most likely make some changes to the circuit and P/S boards. But, I have several IC rectifier packages that I have scavenged. 1 of the supply kits I've been looking at comes with the discrete diodes. *Haven't decided on discrete rectifier diodes or a complete package.
*10,000 uF of capacitance per supply rail *330VA toroidial transformer with +/- 25V rails Therefore, unless I find something even better for my needs in the near future, this will be an LM3886 Gainclone build.Īt this point, here is what I'm thinking: However, that will add complexity, heat, size, and cost to the build. The only thing that looks better and would be more robust would be to parallel the LM4871. Since small and efficient and SMPS are off my list for this build, I have ruled out the TK2050.Īt this point, I think I am just about set for the LM3886 chip. That chip would most likely be great if 2 of your design goals are to have a small amplifier and to have a very efficient amplifier. That chip won't meet my design goals for this project. I may set up an account over on DIYAudio and/or PETT too, as this thread would be more at-home over there. I realize that AH doesn't have a whole lot of users that are deep into the electronics builds, but maybe we can start getting some interest in this direction. So, anybody on AH ever built a design with either chip? Any other chips to recommend? I have a notebook to jot down notes and a parts list, and I have reviewed some ICs as possible candidates.Īs of right now, I have my eye on 2 different ICs for this build:ġ) This is probably my front-runner for now: TI LM3875 Ģ) More power in bridge mode, but more external components and more complicated circuit: TI lm4870 So, I am now in the very beginning stages of this build. Also, this book is geared specifically towards discrete designs. I have read / skimmed this book previously, but that was before I had the classes in Solid State and Linear Integrated Circuits, so a re-read now that I have a more fundamental understanding seems in order.
#LM4766 VS LM3886 MANUAL#
I think my next amplifier project will be another ChipAmp, but this time I will plan to build it from scratch- no kit, no instructions, no parts list - just a datasheet and other reference materials!Īfter I get a successful ChipAmp under my belt, then I will most likely move along to discrete component amps and higher power.Īs part of this build, I have started re-reading High-Power Audio Amplifier Construction Manual by G Randy Slone So, this project got me interested in ChipAmp designs and builds. And, that has been documented (will get updates when needed) on AH and on the BKA forums:
I am wrapping up my report-out for that project in the near future. I recently built and measured a GOBO Chip Amp from Boxed Kit Amps.
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