The transistors are 2SC3858 (NPN) and 2SA1494 (PNP), and feature high bandwidth, excellent safe operating area, high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with the power transistors having a 150W dissipation and the drivers are 50W. This circuit describes an amplifier, power supply and tests procedures that are all inherently dangerous. Nothing described in this article should even be considered unless you are fully experienced, know exactly what you are doing, and are willing to take full 100% responsibility for what you do. There are aspects of the design that may require analysis, fault-finding and/or modification.

I've made gainclone amplifier that uses a LM3886 chip. It's one of the best compact HiFi amplifiers. It is a Class AB-A (conjugate) amplifier that has a fully symmetrical structure (push-pull), this mean that the sine waves produced, will produce a +, - output. A 25 volt (+/- Dual Rail), 5 Ampere, toroidal transformer was used to supply electricity for the amp. There's also a PCB Layout provided for the project. I found an old CPU processor attached to a gorgeous heatsink & fan, I recycled both of them and drilled holes for it to be mounted on the LM3886 chips. Specifications: - Maximum Output Power: 68W RMS - 108W Peak - Frequency Response: 7Hz-25kHz (Filtered ⇒Linkwitz) - THD:%0.03 at 60W - SNR: 110dB at 60 W - 92.5dB at 1W - Output Class: AB-A (Conjugate) - Auxiliary Features: DC/AC Short circuit protection and thermal protection.

Untuk membuat rangkaian power amplifier tidak memerlukan banyak komponen eksternal, karena power amplifier ini hanya menggunakan sistem power supply otomatis. Gambar Skema Rangkaian Power Amplifier. Power Amplifier merupakan penguat akhir bagian sistem tata suara yang dapat berfungsi sebagai penguat sinyal audio yang pada dasarnya merupakan.

- Working Voltage/Power: 12-94 Volts (Dual Rail), 1-10 Amperes - Audio Features: Input Mute Funtion (100% silent = no input) Too bad I had a late documentation, that's why I only have a few pictures of the steps and procedures. Due to the late documentation, I had to get images from the source. Some of the pictures are not mine, there are no claims that the PCB designs are mine nor the diagrams, although there where some modifications made by me for the amp. What Is A Gainclone? Back in 1999, relatively unknown manufacturer released the 'Gaincard' to rave reviews. It immediately caused controversy because it was based around a $5 power amplifier IC (Integrated Circuit), yet a typical setup would cost you around $3300.

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A Gainclone in the other hand refers to any DIY amplifier that uses a LM3875/ LM3886 as it's main component. What's So Special About It?

The gainclone only uses small amounts of space, it's built with a minimal supply of components, yet giving a great HiFi result. It beats the hell out of those modern HiFi amps, it produces 2x68 watts of power, with a Total Harmonic Distortion of 0.03%THD and built on a 2x3 PCB board! So why doesn't the audio industry use it? I'm not really sure.

All of these sounds 'too good to be true', I recommend this project for those who are still starting on their DIY HiFi amp hobby, since it only uses some few components. What's A Power Amp? A power amp is a amplifier with no preamp, volume control, tone control, or any auxiliary devices attached to it.

It's just pure simplicity. Coming Soon: DIY HiFi Preamp With Tone Control (Works With The Gainclone). I can tell that parts in the US are highly expensive.

Here in the Philippines a typical resistor would cost 0.25 centavos ($0.0006), while in america, a typical resistor would cost $1 each. There's a large difference. Also, parts are available here almost everywhere. That's the beauty of living here when you have a hobby of electronics. My project cost me P870.00 ($21.75) all in all. Parts: _______________________________________________ Others: - LM3886 amplifier chip (2pcs.) - 25 Volt, Dual Rail Transformer (Toroidal/ IE) - 2x3 PCB board (2pcs.) - Large Heatsink (2pcs.) - Cooling Fan (1pc.) - Plastic/ Metal Enclosure(1pc.) - AC Cable _______________________________________________ Resistors: _______________________________________________ Capacitors: _______________________________________________.

The LM3886 is the brother of the LM3875. It's the improved version. It produces a higher output wattage, and thermal and mute features are added too.

There are two types of LM3886 IC. One of them is unisolated LM3886T and the other one is isolated LM3886TF. Be careful not to mess with the isolation. LM3886 Gainclone Schematics: (source: ) As you can see, negative feedback line is revised.