STEREO AMPLIFIER for TDA 2004 or TDA 2005 and TDA 1517 3M/MSD, September 1999 Well, here we are again. This time in the section -iron- I decided to present it to your judgment amplifier circuit for TDA 2004 or TDA 2005. Many will say - why the hell... I need it, I need the built-in power... but an amplifier or a magician is quite enough. But it’s not enough - I’ll say. Those sounds that they make complete crap compared to the sound from a full stereo amplifier literator like the one given below, and which, as a consequence, minimality of the circuit, can be placed inside the case without any problems computer (excluding speakers). Moreover, when listening any music on it, you will very soon be convinced that all the music edges of the SPECTRUM world have stereo amplifiers, since most sound samples without it either sound somehow pathetic, or they don’t exist at all I can't hear it. Now let's move on directly to the scheme itself. On my own the circuit is quite simple, but provides an awesome 10 watt stereo reo sound. The second channel is designed similarly, but the leg numbers are indicated nes inside the microcircuit (see diagram). Resistance in 1 ohm i received by winding on low-resistance nichrome wire with parallel connection (probably this resistance can be increase). The power supply should be within 6-18V (12 is better than 5). The capacitor marked * isserves to stabilize the voltage nia, so the larger its capacity, the better. Large capacity at the output it provides highlighting of low frequencies. TDA legs are counted in this order: ┌───────────┐ │ O │ ├───────────┤ │ TDA2004 │ │ TDA2005 │ └┬┬┬┬┬┬┬┬┬┬┬┘ │││││││││││ 123456789│11 10 Amplifier circuit 1 x 10 W (TDA 2004,2005) + 100 ┌──-──║───--o──┐ │ 6-18V │ │ 0.1 │ +o ▒ ▒1K +┌─┬─o┼─-───┤12 ▒ ▒ *220═ ═ ││ ┌──┴─-─┐ ┴ │ 2.2 ┴ ┴ ││ 2│ (9) │10 │ + 2200 ->>─║─┬────┼┼-─┤(1)(8)├─-──o─o─║──┐ +│ 100▒│ 5│ │ 100│ │ ▒ R 330═ K ▒└-─┤(4) │ ═ ═0.1 ▒load. ┴ │ 3│ │11 +│ │ ┴ o─-─┤ (7)├--──┘ ▒ +│ │ 6 │ 1▒ 10 ═ └──┬─-─┘ ┴ ┴ ┴ Here is a diagram for one channel, for the second connectionsimilarly, the contacts are indicated inside, in brackets. Now about the volume control. Since the gain according to voltage is huge, namely 50 dB per channel, then supply sound with computer slot (25A,2SB-SOUND LEFT,RIGHT) is required through resistance (so as not to tear your ears), approximately like this diagram: 25A(LEFT) ──▒▒▒──┐ 1M ▒ ▒───>to the amplifier ▒100K ┴ By the way, a ground for variable resistance is MANDATORY! take it from the amplifier board as close as possible to the microcircuit, and the microcircuit itself can be placed on a radiator just in case, although it does not heat up (the current consumption is only 80 mA at Unut.=12V, and 60 mA at Unut.=5V). One of the problems that may arise for owners of impulse bad power supplies, it’s the extraneous noise they make to the amplifier. The solution may be to increase the capacity *, or installation of a stabilizer type m/s KREN8A at input 9 of the TDA leg. ┌─────┐ │ O │ ├─────┤ │ROLL8│ │ A │ └┬─┬─┬┘ │ │ │ Input 12V ┴ Output 9Vstable And here is another amplifier circuit for TDA 1517 (2 x 6 W.) As you can see, it is simpler, but also less powerful. ┌─────────────┐ 0.22│ │+ 1000 Rn L ->──║─┼1 TDA 1517 4┼──║──>─▒▒▒─┤ L 0.22│ │+ 1000 Rn R ->──║─┼9 3 2 5 7 8 6┼──║──>─▒▒▒─┤ R └──┼─┼─┼─┼─┼──┘ +│ ┴ ┴ │ │ = │ / 100│ ├─┘ ┴ +│ o U 6-18 volts. Well, that's all. I think that in the near future from SPECT- RUMists will enjoy high-quality 80 dB digital stereo sound, and if you have any comments, questions or developments in areas of hardware, coding, etc., then call. It depends on YOU to holding the next issue. 3M: 28-70-91 from 20 to 22 hours. (Marat)
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