LM3875 GAIN CLONE AMPLIFIER: Hello, dear friends! I’ve dedicated a considerable amount of time to crafting an amplifier, and I’m excited to share it with all of you. I hope this will serve as a valuable reference for many. The amplifier in question is a Jeep-themed creation named LM3875. This circuit has garnered immense popularity among international enthusiasts, yet it remains relatively obscure in Turkey. I find it perplexing that such a superb circuit isn’t readily available here. Nevertheless, I’d like to emphasize that, as far as I know, Turkey boasts an abundant supply of its sibling, the LM3886. Both the LM3875 and LM3886 are Class A-AB amplifiers, but they do exhibit some distinctions.
Compared to the LM3886, the LM3875 stands out for its balanced bass and overall tonal balance. I’ve personally imported the LM3875 and developed a relatively straightforward and uncomplicated circuit – free from any pre-amplifiers, buffers, or tone control elements, which can influence the sound quality.
For the chassis, I’ve opted for aluminum components, creating a sleek and minimalist design. In the future, I plan to experiment with copper for a classic bridge-type rectifier, along with the addition of a coil to enhance the linearity of the supply capacitors using “pi” filters.
In terms of thermal management, I’ve encountered no heat-related issues with this circuit, aided by the use of substantial heatsinks. As far as my recollection serves, both the LM3886 and LM3875 integrated circuits come equipped with thermal and DC-AC short-circuit protection features.
Therefore, I would strongly advise against attempting alternative applications like the LM4780, LM3886, or LM3875, as this particular circuit is the way to go for ease and exceptional performance.
LM3875 was a 56-watt amplifier chip made by Texas Instruments (previously National Semiconductor). It was very popular in the DIY audio community for its low parts count and its high-performance audio capabilities. It was the main chip inside many gain clone amplifiers which are based on the Gain card amplifier.
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