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Based on three characteristics: good quality sound, easy to make, and not expensive circuit, this TOSHIBA DX is worth to try. Just need 36VDC voltage input as a fuel, the circuit can produce 100W output on 40 Ohm speaker or 50W on 80 Ohm, using a pair of TOSHIBA A1943 – C5200 per channel.

With 4 pairs of 2SC5200 and 2SA1943, this circuit can produce about 500W. Voltage input as the fuel is +/- 65V. And for best result, you must use heatsink and fan. This circuit also feature circuit protection using fuse.

The circuit using active component to operating. In this case, the active component is IC NE5532 or TL072 as a linear part. With 15 V power supply, this circuit separate the low out and high out. The low out connected to a woofer, and high out in tweeter.

Very high power amplifier with 10 pairs of power transistor. Can use MJ15024 and MJ15025 or MJ21193 and MJ21194. Those 20 pieces transistor work as final active component for final gain. This circuit required dual output power supply 130V.

Here is a portable headphone amplifier for your music player. This circuit improve the gadget audio outputs with low noise and distortion, as well as a long battery life. With an external amplifier, the headphone driver in the music player is no longer required to supply high currents into a low impedance.

Based on super hetero dyning principle. The circuit using 2 RF oscillators. The frequencies of all oscillators are at 5.5 MHz. The first RF oscillator consist of transistor T1 (BF 494) and a 5.5MHz ceramic filter. The 2nd oscillator is a Colpitt’s oscillator accomplished with the help of T3 (BF494) and inductor L1 shunted by [...]

This circuit possible to deliver about 200W power output produce by Phillips Semiconductor. Using 2 PHP1BN11QT, input voltage between 30 and 45 VoltsDC for this circuit, trigger the 4Ω impedance load speaker in to a powerful audio output. Other features of this circuit are THD+N (total harmonic distortion-plus-noise) PL = 10 W frequency range from [...]

This circuit can be applied on any source of audio signal like microphone, mp3 player, radio, etc. The aims is smoothing the voices with echo. Using four ICs as main active components, produce a repetitious sound.

Here is 6-transistor 140 Watt audio amplifier. Using 2N3569, 2N3055, 2N4355, and MPS6533 this circuit can be useful for your home audio. The amplifier work with 30 V as the input voltage and produced output will be received by 8 ohm impedance speaker.