What is it?

This is a LM386 based high-quality stereo amplifier. The amplifier has embedded 3 W power AC-DC supply module which works from 100 to 240 VAC. The output power can reach 1W per channel. The amplifier is characterised with very low distortion: 0.2% (AV = 20, VS = 6 V, RL = 8 Ω, PO = 125 mW, f = 1 kHz) It has three control knobs: - Main volume (controls the main volume of both channels) - Channel balance - can be used to adjust the stereo base of the output if some difference in the speaker's cable length, their position or impedance exist - Bass boosting - shaping of the frequency response of the amplifier - boosts the low frequencies for better performance.The transfer characteristic can be seen on the picture. The amplifier is offered in three versions:

• DIY kit - very easy to assemble kit - all device values are printed on the board - no schematic needed
• Assembled amplifier board
• Amplifier in nice 3D printed case

Why did you make it?

This product is acquired from Idellia. The LM386 is available on the market since 1983 and it became the most loved and used audio amplifier chip for decades. Different amplifier designs are available on the market but none of them combines all the features which Idellia have implemented in the design - all the tuning options and the embedded on the PCB power supply module. Placing the amplifier in a nice plastic box makes it fully plug and play audio amplifier with excellent sound quality.

What makes it special?

All the features mentioned above make this kit/amplifier very unique. The PCB used is high quality black board with all parts values labelled on it. You do not need any schematic to solder it - simply mount each device corresponding the label on the PCB. The kit/amplifier uses high quality metal oxide film resistors and electrolyte capacitors. The LM386 chips are mounted on sockets - for fast replacement if burned out (if this is possible?!?) There is a fuse placed on the PCB protecting all the circuitry. The fuse can be very easy replaced. The assembled version is mounted in nice 3D printed box.Under request another box colours are available: black, silver, metallic, grey or yellow.

Finally - Some safety remarks: On the PCB exist dangerous for your life high voltages! Be very careful when working with the amplifier! The board shall be placed on insulating surface - Never place it on metal table without plastics or thick cardboard insulation. Never touch the board in the region marked on the picture. It is recommended that the amplifier board is mounted in plastic or wooden case. If you want to use a metal housing - mount the board at some distance from the bottom of the box using spacers.