The input sensitivity is in the vicinity of 750 mV. Total harmonic distortion is less than 0.01 %.įrequency range is within 20 Hz and 20 kHz. Power output is 60 watts into 8 Ω and 100 watts into 4 Ω loudspeaker. The remaining portion of the circuit is mainly the output stage and is responsible for amplifying the differential stage into the loud speakers. Transistor T1 and T2 are wired up in a standard differential amplifier mode. The presence of R2 and C2 ensures no frequency above 250 KHz makes its way into the circuit, thus blocking most of the high frequency RF intrusions. C1 also functions as an input stage DC bias isolator. R1 and R2 fix the input impedance, and the inclusion of C1 creates a high-pass filter that blocks all frequencies around 1.5 Hz. The input stage employs the standard R/C filter configuration. Transistors T9, T10, T11 and T12, T13, and T14 form two well-balanced halves of the circuit, perfectly complementing each other. However a closer look will prove this wrong. Circuit DescriptionĪt the first glance the circuit rather appears to be unsymmetrical in design, due to an unbalanced looking output stage. I have personally tested this circuit and believe me its response is outstanding, build a couple of them and it becomes compatible with stereo inputs- that also means now you are producing 200 watts of brain-pounding music power. If all the connections are done accurately as shown in the diagram, the circuit should immediately start “pumping” your loud speakers with a high quality music output.
The entire circuit utilizes commonly available components and may be simply built over a general purpose board. If we compare the simplicity of the proposed 100w transistor power amplifier schematic design to its power output, which is a good 100 watts, indeed it looks very impressive.
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