Circuit-Zone.com - Electronic Projects

LM3875 Gainclone Amplifier
Posted on Thursday, May 26, 2011   •   Category: Amplifiers

LM3875 Gainclone Amplifier

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.

     700W Leach Amplifier
     Bass Treble Tone Control Circuit
     LM386 Amplifiers
     LM3886 Power Amplifier 100W
     HI-FI Valve Amplifier
     LM4780 Gainclone Amplifier
     Low Power Stereo Amplifier with TDA2822
     150W LM3886 Power Amplifier
     DIY 4 x 22W Car Audio Amplifier Based on TDA7384
     Stereo Audio Amplifier with TDA2616
LM3875 Gainclone Amplifier


Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]

Circuit-Zone.com © 2007-2023. All Rights Reserved.

AC / DC Innveters
AM Radio
Audio Attenuators
Audio DAC
Battery Chargers
CNC Milling Devices
Counters / Frequency Meters
Fluorescent Lamps
FM Radio / Receivers
FM Transmitters
Frequency Wave Generators
Headphone Amplifiers
iPOD Hacks
LC Meter
Motor Controllers
MP3 Players
PC Circuits
Phone Circuits
PLL Circuits
Power Supplies
RC Servo Motors
Remote Control
RF Radio Frequency
Solar Circuits
Stepper Motors
Stereo Encoders
Test and Measurement
Timer Circuits
TV Transmitters
USB Circuts
USB Interface Adapters
USB Soundcards / USB Headphones
Volume Control