I had to look up the datasheets for the C1237HA and LM4766 to figure out what caps went where. The silk screen has most of the parts labeled except for a few polarized caps. Seem like a good chip for 2 channels if driven to less than 20 to 30 watts depending on the PS voltage. In reviewing the specs it seem that the LM4766 if not driven to high output levels has a reasonable low distortion level on par with the LM3886 for my old ears that can even hear 12KHz.
![lm4766 vs lm3886 lm4766 vs lm3886](https://m.media-amazon.com/images/I/41AThoUKNtL._AC_SX425_.jpg)
It wouldn't fit my needs as I need 2 channels and to have no use for more than probably 10 watts per channel.Įveryone seem to loves the LM3886, but not much is said about the LM4766. So they should say 120W into 8 ohms not 4. With the right layout and component selection, you can build an excellent sounding Hi-Fi audio amplifier that will rival high-end amps retailing for. The reason for its popularity is due to its very low distortion, minimal external components, and low cost. So at best I2R = 4x4x4=64 watts for 4 ohms, 4x4x8=128 watts into 8 ohms. The LM3886 is one of the most highly regarded audio chip amplifiers in the DIY community. The LM4766 is current limited to about 4 amps.
![lm4766 vs lm3886 lm4766 vs lm3886](https://ae01.alicdn.com/kf/Haf98508909404ffbaaf17b8704d46320V/TDA7292-fever-amplifier-board-effect-TDA7294-LM4766-LM3886-TDA7293.jpg)
I don't know how this would get 120Wat 4 ohms.
![lm4766 vs lm3886 lm4766 vs lm3886](https://img.joomcdn.net/0a97117ff3dfcbd338ba676d59461d74263a87df_original.jpeg)
I write "real" because you can trust no Chinese seller to use the expensive ($3) TI chip. You can discuss the speaker protection, as the real LM4766 chip has an anti pop and fade in fade out function. The real LM4766 is an amp just sounding perfect. If acquiring a transformer, remember that AC mains voltage transformers' "VAC" ratings are usually in terms of RMS, which means their peak voltage is actually 1.414 times that.At first sight, this amp looks OK and no major components are missing. That's it! These chipamps work just fine with a simple unregulated power supply. Then all you need is a fuse, a bridge rectifier (or individual diodes), and two or more big electrolytic capacitors. Just get a transformer with a dual secondary, or a center-tapped secondary, with each secondary having the voltage needed, at a high-enough current. And making a split power supply is easy, too. What makes you want to use a single supply, so badly? A split supply is easier. But it's a little more complicated, and might even compromise the sound quality, slightly, by necessitating electrolytic input and output AC-coupling/DC-blocking capacitors.īut yes, the single-supply schematic, in the datasheet, should be perfectly fine (especially if you have a 48v to 52v supply). Anyone here ever compared the LM4766 stereo amp against such class-D boards, such as the TA2024, which I also have (or the TP3110. It depends a lot on your level of ambition. It says "The typical application of the LM4766 is a split supply amplifier." LM3886 is one attractive possibility though it is actually a single channel chip. See page 16 of the LM4766 datasheet, at **broken link removed**. Plus, it would only give you about 3 Watts per channel. The datasheet shows 20v as the absolute minimum guaranteed-to-work difference between the supply rails.
![lm4766 vs lm3886 lm4766 vs lm3886](https://alitools.io/en/showcase/image?url=https%3A%2F%2Fae01.alicdn.com%2Fkf%2FH3f6e8d7312f2476892028fa9ddefbc2fk.jpg)
A +/-24v split supply is equivalent to a 48v single supply.Īlso, your original 20v single supply would be worrisome. So it does mean both + *AND* - 24 volts, i.e. The posted graph has "(+/-V)", right after the words "SUPPLY VOLTAGE", in the horizontal axis label.