Quad Car Amp
Published in issue 323, July 2003
This quad final amplifier is actually intended to be used in a car, but it can naturally also be used for a variety of other medium-power applications. The TDA7375A can be successfully used in all situations in which a reasonable amount of audio power is desired and only a relatively low supply voltage is available. This IC is the successor to the TDA7374B, which forms the heart of the active loudspeaker system described earlier this year. Such a quad IC amplifier is naturally an excellent choice for this application, especially since the individual amplifiers can be connected in pairs in the bridge configuration, which allows them to provide approximately four times as much power. An example of such a bridge configuration is shown elsewhere in this issue.
R1-R4 = 100Ω
R5 = 10kΩ
R6 = 0Ω1, 5W
P1-P4 = 10 k preset
C1,C3,C5,C7 = 15nF
C2,C4,C6,C8 = 220nF
C9 = 10µF 63V radial
C10 = 47µF 25V radial
C11-C14 = 3300µF 16V radial, max. diameter 13mm, e.g., Panasonic (Iripple 2500 mA) or Rubycon (Iripple 3400 mA)
C15 = 100nF
C16 = 1000µF 25V radial, max. diameter 13mm
IC1 = TDA7375A (ST)
F1 = fuse, 4A/T (time lag), with PCB mount holder
2 fast-on (spade) terminal, male, vertical, solder type (2-pin version)
Click below to download a PDF copy of this article from Elektor magazine.
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.