Tag Archives: DIY

2SC5200 & 2SA1943 output power stage

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Every audio amplifier is made basically of three blocks, each one with different purposes:

  1. Voltage Amplifier – it receives the input signal with high impedance (tipically 47kohm) and amplifies it so that can drive the driver stage
  2. Driver Stage – is places between Voltage Amplifier and Output Stage and adapt and sometime “processes” the signal so that can drive the output stage
  3. Output Stage – is the final block in charge of deliver high currents, so that the amplifier can handle low-resistance loads such as a speaker

out_pwr_st_diag

The project that I’m about to present is an output power stage, capable to handle more than 500w if mounted on a suitable heatsink.

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Schumann Resonator

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The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth‘s electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth’s surface and the ionosphere.

(from Wikipedia http://en.wikipedia.org/wiki/Schumann_resonances)

Schumann resonances are claimed to provide equilibrium between people and Earth, since the main frequency (7.83Hz) has a wavelength of 38000Km (about the circumference of the Earth). Most of scientific community argued that a body small like the human one can’t obtain advantages from this frequency. Despite of this, some audiophiles (in which I also agree) says that when in presence of a Schumann resonance the music listening is more relaxed.

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