Circuit Wiring Solution: 25w

Showing posts with label 25w. Show all posts

Saturday, September 6, 2014

TDA7490 Audio Amplifier 2 x 25W 1 x 50W

TDA7490general description:

The TDA7490 is a dual audio class D amplifier assembled in Flexiwatt 25 package; it is specially designed for high efficiency application mainly for TV and Home Stereo sets. TDA7490 Audio Amplifier 2 x 25W / 1 x 50W

TDA7490 features:

25W + 25W OUTPUT POWER:
RL = 8Ω/4Ω; THD = 10%
HIGH EFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (FROM
±10 TO ±25V)
SPLIT SUPPLY
TURN OFF/ON POP FREE
ST-BY AND MUTE FEATURES
SHORT CIRCUIT PROTECTION ACROSS
THE LOAD
THERMAL OVERLOAD PROTECTION
EXTERNALLY SINCHRONIZABLE
BRIDGE CONFIGURATION

TDA7490 sterio circuit diagram:

TDA7490 Audio Amplifier 2 x 25W / 1 x 50W circuit diagram

TDA7490 mono circuit diagram:

TDA7490 Audio Amplifier 2 x 25W / 1 x 50W mono circuit diagram

TDA7490 sterio circuit pcb:

TDA 7490 pcb layout

Friday, August 29, 2014

2N3004 Audio Amplifier 25W

Transistors are used for current sources. Base drive for these transistors is derived from the main power supply VA, so that their collector current is proportional to the rail voltage. This feature holds the voltage on the cliff-amp collectors close to VA/2. The sensitivity of Iq to VA is about 3.4 mA/volt when VB is held constant; the sensitivity of Iq to VB is -15 mA/volt when VA is held constant. In a practical amplifier with a non-regulated supply, variations in power output will cause fluctuations in VA, but will not affect VB; therefore, having Iq increase slightly with power output will tend to compensate for the 3.4 mA/volt IqVa sensitivity. In the case of line voltage variations, since VA is about five times VB, the sensitivities tend to cancel, leaving a net sensitivity of about 2 mA/volt.