Amplifier 4x22 W
Surely many would like to have an audio 5.1 home system, but at frequent prices for such amplifiers are quite large. I'll tell you how simple and not very expensive to assemble a 4-channel amplifier for such a system. Digging into the Internet, I chose the most simple in the assembly and not expensive amplifier of sufficient power. Namely, the amplifier on a fairly popular TDA 1558Q microcircuit This microcircuit itself is already a ready-made 4-channel amplifier with a power of 11 W per channel, but this power will not be enough to get high-quality and surround sound, so we will connect it with a bridge method, it's easier saying we pair 2 channels and get a 2-channel amplifier with a power of 22 watts per channel. Thus, we take two chips and in the end we get 4x22 watts. If the microcircuit is touched separately, then from the merits one can call the simplest connection scheme, not a high price and decent power with a small unipolar voltage, protection from KZ. overheating and wrong power connection. The disadvantages: low efficiency of the order of 50% (high current consumption and high heat even in idle mode) Also at peak power, the soundsharply cropped and turns roar. Now let's get to the assembly and first get acquainted with the circuit.The circuit is extremely simple and is assembled in 10-15 minutes, its simplicity allows you to solder it by mounting it, it is also worth recalling that the circuit has the thermal characteristics of an iron and it needs a radiator of about 600 cm2 area and either an open case or forced cooling in the form of a fan. Here is the set of parts that I needed to assemble the amplifier.I used two diode bridges for the reason that I used a transformer with two similar windings, one for 8 A is usually enough. Two plugs 3 were bought separately, 5 for inclusion in the computer's audio card.Now I think you can go directly to the assembly of the amplifier. I did not have a ready-made power supply and I had to assemble it myself, and I recommend you to do the same, because it’s not easy to find ready-made power supply units with the necessary power reserve because at a voltage of 17 V one chip consumes about 3 A even when it is “silent”. Also, if you turn off the 14th contact, the amplifier will go into “Sleep mode” and the current consumption will drop to a couple of hundred mA. bridge. We take it and install it on a small heatsink. (I didn’t have a little one)Then we solder capacitorsAs I also needed to install a transformer for another device I decided to separate the power supply from the amplifier itself.
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