Circuit High Audio Frequency LM4702
New chip LM4702 from National Semiconductor allows you to create audio-frequency
amplifiers (AF) with a nominal output power of 300 W and low noise.
Practice shows that the use of power amplifier
circuits AF (audio frequency) performed on a single chip, the main factor in choosing components for reproducing parts of the developed device are easy to set up and a small number of elements binding. However, in most cases the quality of the sound signal does not fall under the class HI-FI in connection with a high percentage of non-linear distortion.
Distortion of these chips even with nominal power up to 10%, which is clearly audible during playback. Power output of such chips is less than 100-150 watts at load resistance of the dynamic head 8.4 ohms. However, there are better items for the construction of the AF output of the amplifier, for example, a series of micro STK.
They are made on unpackaged items, arranged on a metal substrate with dielectric spacers. The price of such micro, usually several times higher than that of similar power odnokri stalnyhusiliteli AF with a rated output power up to 300W with low harmonic distortion (0.005%, including the noise) and low noise (the equivalent noise voltage 3 mV),