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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Gainclone LM PCB – Electronics Projects Circuits

This resistor can also be omitted in most cases, which is best determined experimentally. 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.

You wire the two boards using the parallel mode schematic. This reduces the risk of DC offset voltage appearing at the output of the amplifier, which may have an pbc affect on the operation of the speakers, as well as the amplifier.

km3875 Dual bridge rectifiers as shown above. The signal into the ultra sonic filter circuit, which include of capacitor C3 and resistor R3 and R1 To act to prevent the radio noise signal and attenuate RF signal is lower, before the signal will into pin 7 thus this have high gain up to 25 times.


From stereophile Z in data. I followed the Gaincard pretty closely in using the mute switches, the attenuator, and choosing to have the ln3875 gain and input impedance.

Soft recovery types are probably the best bet. I noticed much more detail and the sound was much more controlled with my amp.

Gainclone LM3875 PCB

First was a W x 2 Kenwood amp. It is not a bad idea to add a switch on the rear pxb the amplifier, whereby the star i. Separate position attenuators for each channel. Parallel mode allows the amp module to drive a 4-ohm load at W. This image is to be used as a guide while assembling. The following is a suggested layout-schematic for the power supply: This result is shown below: I prefer two bridge rectifiers, but one bridge or 4 individual soft recovery diodes can be substituted.

LM Gain Clone Amplifier Project – Electronics Projects Circuits

For R1 and R5 I’m not sure. Power cord is captive four pin molex, one per channel. Rather than using one board for stereo, you will need 2 boards, each one running in a parallel mode. It is provided for your personal use only and may not be reproduced, re-distributed, re-transmitted, copied or otherwise used in any form without the express written permission of the author.


Generally, the lower the impedance of your speakers, the lower the voltage should be. The capacitor C5 is connected to R6 help lower frequency to -3dB at frequency about 10Hz. You can also quadruple the power into an 8-ohm speaker. The only donwnside is it is only capable of driving an 8-ohm speaker.

When the DRV board is finished, you simply connect the input to it, and one of it’s two outputs to both amp inputs. Top Background Information Some things we know for sure: In Figure 3 This project is non inverting amplifier circuit. In short, no excuses. However, if you decide that you wish to squeeze more power from the amplifier, you will surely need better cooling. Figure 5 the components layout. The IC include circuitry to block a lot, for example, prevent a spike or block the signal of the power circuit, short circuit protection and output over voltage protection circuit, out of voltage or overload.

This result is shown below:. We use a IC as main parts is.

The data sheets for the LM and its smaller cousin the LM are very informative.