Li-Po charger and balancer using LM317

This is a Li-Po charger and balancer project for R/C hobby.The charger circuit is based on the circuit of Electron head and all folks in the DIY electronics topic on the rcgroups.com.

300 Watt MOSFET Real HI-FI Power Amplifier

Description:

My passion for excellence progressed over the past 40 years to developing sonically superior amplifiers to the highest possible standards, providing life like sound performance.

I am committed to sharing my experience of the RAS 300 with other enthusiasts sharing my passion for perfection.I designed this minimalist amplifier to be durable, simple to operate while offering high fidelity equivalent to the original sound source and would recommend partnering this amplifier only with other products of outstanding quality.

When I set out to design this amplifier, my aim was to create a product most suitable for the reproduction of complex music and speech signals. Although I placed high emphasis on electrical characteristics, the single most important requirement is achieving an audibly superior sound, vivid spatial imaging and superb tonal clarity.

Although the average listening level is normally less than 10 watts, my design approach was to create an amplifier with ample reserve power, but biasing it for class A at average listening levels reducing cross-over distortion to extremely low levels.

There is not one capacitor in the signal path, improved the accuracy of the tonal characteristics of instruments and voices significantly.
The RAS 300 has almost zero phase distortion far beyond the audio range resulting in perfect resolution and totally un-coloured sound.

Amplifier Specification:
Maximum Output: 240 watts rms into 8 Ohms, 380 watts rms into 4 Ohms
Audio Frequency Linearity: 20 Hz - 20 kHz (+0, -0.2 dB)
Closed Loop Gain: 32 dB
Hum and Noise: -90 dB (input short circuit)
Output Offset Voltage: Less than 13 mV (input short circuit)
Phase Linearity: Less than 13 0 (10 Hz - 20 kHz)
Harmonic Distortion: Less than 0.007% at rated power
IM Distortion: Less than .009% at maximum power

The amplifier consists of two completely separate monaural amplifiers each channel has its own power supply, resulting in zero inter-channel cross talk, a common phenomenon in amplifiers sharing the same power supply.

In order to obtain the full output power each supply transformer should be rated at 40VAC - 0 - 40VAC at 640VA. Unlike many designs relying on the reservoir capacitors to supply peak currents, I prefer to have the raw power available from the transformer resulting in much faster transients.

Although the RAS 300 specifications are moderate, when listening to it you will immediately experience the massive reserve power available and never have any cause of anxiety that something is going to give in that one would when driving many amplifiers loud.

You will hear nothing but reality with no distortion at any level and I guarantee that this amplifier will divulge the best qualities of any equipment connected to it.

Basic electronic components and supplies required for the Newbie Electronics

Essential components and accessories to start

The work on electronic projects is a good way to learn electronics and will be implemented depending on the project, a series of tools and electronic components can be requested. There are some basic elements and services that are needed in almost all electronic equipment and are a must.

The first electronic components that must be taken into account are resistances. You should have a good selection of resistancedifferent values in the range of a Mega-ohm to 10 ohms with a tolerance of 5%. Carbon film resistors are a good choice for small electronic projects. They are cheap and easily available both online and offline retailers.

Another important element that is necessary is for capacitors. Ceramic disc capacitors or electrolytic capacitors are both a good choice for beginners electronic design, and also a good choice would be needed in terms of values. (Lower voltage capacitors to50V) would probably suffice for most entry-level projects.

Signal diodes are also a good buy for electronic design and electronic components are used in a variety of projects. A package of 50, the silicon diodes 1N914 are a good choice, because switching and analog signals can be used.

The next component is electronic rectifier diodes, which are kept in power must be verified. Approximately 20 of these diodes at different values of a good number would startwith.

Transistor electronic components are considered later. PNP and NPN, which are the most common and widely available transistors would be needed. Recommend TO92 package for beginners.

The LEDs are a mixture of colors and rectangular and packages around a good addition. Most standard LEDs are now available through 3V to their power.

A switch is a component well in hand. Often used to the circuit switch on or off. If you useSelect Start, select a switch or button.

Depending on the circuits and integrated circuits, some projects would also be necessary. One of the most commonly used ICS is the 555-timer. Like all the above components, which are listed in a through hole and surface mount packages. Begins with the through the hole until you feel comfortable soldering small components.

Last but not least, some wire and coupling circuits are a must forElectronic projects. Depending on your project, how about a box design or accommodation? They protect the circuit from the elements and dust and can be fixed with screws.

Ready to get started with electronics? Now you have the basic elements together, find a good book on basic circuits. If you really have no experience with electronics, is not afraid of a book that is for children to achieve. The simple explanations and illustrations in these books you're ready to go tothe next phase of testing in a hurry!