ULF with unipolar 12-volt power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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A range of easy-to-replicate and low-cost ULF bridges are available with unipolar 12-volt "multimedia-car" power.
The first and second provide 4 W power at a 16-ohm load and are made on common TDA2003 and TDA2005 ICs. The inductance L provides noise filtering along the power circuit; structurally, it is made with PEL-0,6 wire - one layer turn to turn on a ferrite rod with a diameter of 5 and a length of 50 mm. More powerful - 2x25 W at a load of 4 ohms - the amplifier is made on one more modern TDA7375 IC, containing four amplifiers forming two bridges. Pin 7 here can be used for "Mute" mode ("Muting", "Vezerles").
(click to enlarge)
Three TDA7375 microcircuits allow you to create a powerful (2x50 W LF + 2x25 W MF / HF) audio complex with the so-called. "active" two-way speakers. Here, the upper and lower microcircuits create the left and right stereo bass channels, loaded with two woofers each, and the middle microcircuit is used in the mid/high channels, loaded with one tweeter each.
Separating filters for low-frequency channels are formed by chains, which include resistive dividers 3,3 kOhm - 510 Ohm and capacitors C1 * = 0,68 μF, and high-frequency channels - capacitors C2 * = 0,055 μF and resistors 3,9 kOhm - 1 kOhm, in this case, the frequency of the section of the LF/HF links is about 560 Hz.
Author: Gilzki Josef
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