The Gainclone. Introduction: Background Info: Construction Notes. Introduction. The model Gaincard from 47 Laboratories is a 25 Watt stereo amplifier. Check for Samples: LM The LM is a high-performance audio power LM to reduce the effects of PCB trace resistance and inductance. PCB for 56W Audio Amplifier using LM HiFi Amp. For LM IC. High quality FR4 double-sided, plated-thru and tinned holes, with conformal coating.

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This capacitor prevents large DC currents from being sent to the speaker when the input connection is disconnected. It is reccomended to use a. It may look ugly at pb, but its really very smart and compact.

LM3875 Gain Clone Amplifier Project

We use a IC as main parts is. The DRV inverts and balances the signal so that one of two non-inverted amplifiers amplifiy an inverted signal, thus allowing bridge mode to work.

Top Background Information Some things we know for sure: You can use a linear power supply to take at next level this circuit. Undistorted volume levels were also much better. All circuit grounds should meet at only one point i. This page dates back to the beginning when the Gaincard was literally a black box. As a result, you will need to use four amplifiers two boards per speaker and a circuit capable of inverting the signal to one of the amplifier pairs.


This chip delivers unbelievable quality, especially for it’s low power levels. 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.

If ,m3875 are planning on driving 4-ohm speakers, use one board per speaker, with the positive outputs wired together. Dual lj3875 rectifiers as shown above. The total cost of the project is a mere odd EUR so heck, why not? The following is a suggested layout-schematic for the power supply: I can’t comment on sound quality in parallel mode, because I only wanted to use that mode to try and run a 4 ohm subwoofer speaker.

The Gainclone

The only donwnside is it is only capable of driving an 8-ohm speaker. Power supply parts list: Leave a Reply Cancel reply. I also compared it with a W x 6 home theater amp, and the home theater amp in stereo modewas able to reach higher volume without distortion, but they were very close in sound quality.

When the DRV board is finished, you simply connect the input to it, and one of it’s two outputs to both amp inputs.

The model Gaincard from 47 Laboratories is a 25 Watt stereo amplifier about the size of a video cassette, powered by a large external supply. If ran at a low voltage, it will be able to drive a 4-ohm load, though not well. This amplifier is compact, looks great, sounds great, has a few dozen clean watts per channel, and dissipates only 2.


Typical operation, from the LM datasheet: Many electronics circuits and projects for learning in simple ways. Figure 1 The amplifier schematic is shown in Figure 1. R4 is soldered directly between the leads of the IC, which is itself tucked underneath the board together with R2 and R5.

LM Gain Clone Amplifier Project – Electronics Projects Circuits

The wiring is done like this: LM Gainclone Amplifier Indroduction: This resistor can also be omitted in most cases, which is best determined experimentally. Separate position attenuators for each channel. And its its an easy and safe project to build. Figure 1 The pins using of LM Capacitors C1 to C4 are used for the filtration of the ripple voltage from the rectifier. All the capacitors and R3 are on the top side. This gives the stated nine part circuit. I used carbon film resistors for R2-R4, metal film for R1, and metal oxide for R5.