After my first Chipamp I felt encouraged to build another one. This time it was supposed to be a Gainclone and this time also in a proper case - not just a couple of MDF boards like the first one. So I set out to order a kit at Audiosector. The kit is of great…
I purchased the Audiosector Gainclone LM3875 PCB + component kit about four years ago, it sat under my desk gathering dust until this year, when I finally decided to put it to use. The Gainclone concept is based on the original Kimura-San/47Labs Gaincard design, which takes a "less-is-more" approach, low component count, extremely short signal…
Gainclone amplifiers have VERY few components and this one is based on the National Semiconductor LM3875 IC. The PCBs and components are very simple and quick to make, only took about 20 mins to assemble both amps and rectifier board. DC offset was about 80mV on one channel and about 40mV on the other. I used the optional Ci capacitor in the national datasheet for the IC which reduced it to between 0-4mV: This is the capacitor I chose, its an Elna Starget (expensive). The case was MUCH more time consuming and difficult to make though. I bought all the aluminium from a scrap metal yard including the heatsink. I got my aluminium panels cut at a sheet metal shop as I cant make straight cuts with a hack saw.
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This is a basic design with a single LM3875TF chip per side, and one shared toroidal transformer. I will be making two of these amplifiers simultaneously but with a few critical component differences. One is based on standard components, and one on premium components. There was a lot of deliberation on the type of transformer to get, particularly the secondary voltages. The concern here is the target load as, generally speaking, the higher the voltage, the less suited it is to drive low impedance loads (4ohms). I settled on 20 volt secondaries which I think is a good compromise, feeling that 18v is perhaps a little too low and 22v a little too high to get the max with a 4 ohm load whilst minimising output loss if using 8 ohms. The ability to run stable at 4 ohms is paramount to me to keep it open to different applications, and output wattage is relatively unimportant for this design.
It is a 2x56W power amp based on National Semiconductor's LM3876T chip (they come in 2 versions T and TF the latter having an insulated case), this type of amp is also known as a gainclone because it is an improved copy of Gaincard amplifier. seriously this amp can outperform most commercial amplifiers/receivers (minus the video upscaling/switching) when built properly ie it has very low THD you will not be disappointed by how good it sounds . When connected to AV equipment such as dvd players this thing gets insanely loud (despite having only 56W per channel), i've have never required more than 25% volume because it hurts my ears NOTE: a even more powerful version using the same circuit with a LM3886 chip can be made giving 68W per channel.
I'm building this multi-amp to drive my DIY speakers. They are 4-way active dipole prototypes with MiniDSP crossovers. Currently they are powered by...
diy audio system
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Stereo Gainclone Power Amplifier using IC LM1875 output power up to 20W / Channel. This recommended power amplifier for the audiophile that have low distortion.
This is a 60W class-AB amplifier built around the LM3886 IC. This LM3886 chip amplifier (gainclone) project was built using PCBs from chipamp.com.
Se utilizar LM3886TF, não será preciso de isolante e bucha, as outras versões precisam do isolador e bucha ao fixar o circuito integrado ao dissipador de
I recently built a dual-mono LM3886 gainclone chip-amp amplifier. In this article, I describe the parts, construction and results.
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from
Beginner's Chip Amplifier, HiFi LM1875, The Amplifier Board This is for the purpose of an accessible hifi chip amplifier, it is in reference to Commercial...
LM3886 amplifier board gainclone LM3886TF PCB, LM3886 updated with PCB layout, this circuit is a high-quality audio amplifier using integrated circuit for up
DIY LM3875 Non-Inverting Chip Amplifier (Gainclone) Project.
5.1 Home theater power amplifier circuit using LM1875 and LM3886 gainclone chip. That is ultra hifi hometheater amplifier. And this circuit is complete power supply and preamplifier circuit but not include 5.1 sound processor. See here to view schematic and download the PCB gerber file.
DIY HiFi Gainclone Power Amplifier (2x68w, Class AB-A, LM3886): I've made gainclone amplifier that uses a LM3886 chip. It's one of the best compact HiFi amplifiers. It is a Class AB-A (conjugate) amplifier that has a fully symmetrical structure (push-pull), this mean that the sine waves produced, wil…
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