Folks: I have finished four LMbased amps using Brian Bell’s terrific PCBs and am thrilled with the result. But as I follow the various threads. LM OvertureTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier. The is a high-performance audio power amplifier capable of. Gainclone amplifiers have VERY few components and this one is based on the National Semiconductor LM IC. The PCBs and components are very simple .

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I did run into a problem during assembly though. The case can be left floating or attached to the signal ground.

LM3875 Gainclone Power Amplifier

If anyone needs a quality music system, this is the way to go. Last update 28 July A 50 kOhm volume potentiometer could be substituted. A look at the images reveals just how small this amp is.

The non-inverting circuit shown here is, for better and for worse, the most faithful rendition of the original Gaincard possible given what was then publicly known about it. Moving magnet phono pre-amplifier – 1.

It can be connected to lm3785 type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground. My system has two kinds of equipment, those that stay on all the time and those that get turned on with a master switch. I really didn’t need any more amps and the spousal concern factor has been growing!


56W Audio Power Amplifier Using LM – Circuit Ideas I Projects I Schematics I Robotics

Two ground points are defined, the base of R2 is the signal ground S and the base of R3 the power ground P. It is understood that Kimura removed the film bypass caps C3 and C4, and R1 on the circuit will be replaced by the stepped attenuator. The jacks are gold plated and pretty decent. I also have pretty much the same short length of signal path and feedback loop, the latter obtained by soldering R4 directly across the chip leads.

From stereophile Z in data. The circuit is based on the typical application given in the datasheet but with a few changes as follows: The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.

I use it as my family room amp driving two 63L 12″ woofer based 3-way system. A ferrite choke on the end of the power cord is used to reduce any stray EMI from lm875 into the amp. In fact, I doubt if anyone could ever tell the difference simply by hearing it.


The box size is Lm3857 94 X 34 mm. It sits in the palm of your hand and has two volume attenuators, oversize solid brass isolation feet with pads, gold plated heavy duty speaker terminals, gold plated input jacks, pure silver Measurements are helpful to refine, but I allow my ears to be the final judge on any changes. For R1 and R5 I’m not sure. It may look ugly at first, but its really very smart and compact.

My original plan was to build a chipamp with a solid state or tube buffer. But nonetheless, I took the leap and forged into new territory. So change of plan, flip the amp over and see its ugly belly. I followed the Gaincard pretty closely in using the mute switches, the attenuator, and choosing to have the same gain and lk3875 impedance.

A modest heat sink stuck on a piece of tin, how tacky. LM product folder and LM I had plenty of small enclosures but nothing big enough. They come with snap in jacks of all types. The only area the K beats the Beauty and Beast is in midrange detail and sound stage. There is a zobel network at the output. The data sheets for the LM and its smaller cousin the LM are very informative.