Despre preamplificatoare

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Să începem cu nivelul optim al semnalului procesat :

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Description

Elektor Pre-Amp Hi-End 2012



Specifications

Test conditions: supply voltage ±17.6 V; all measurements symmetrical; tone control defeat disabled.

Test equipment: Audio Precision Two Cascade Plus 2722 Dual Domain (@Elektor Labs)

THD+N (200 mV in, 1 V out) 0.0015% (1 kHz, B = 22 Hz – 22 kHz) 0.0028% (20 kHz, B = 22 Hz – 80 kHz)

THD+N (2 V in, 1 V out) 0.0003% (1 kHz, B = 22 Hz – 22 kHz) 0.0009% (20 kHz, B = 22 Hz – 80 kHz)

S/N (200 mV in) 96 dB (B = 22 Hz – 22 kHz) 98.7 dBA

Bandwidth 0.2 Hz – 300 kHz

Max. output voltage (200 mV in) 1.3 V

Balance +6.3 dB to –6.3 dB

Tone control ±8 dB (100 Hz) ±8.5 dB (10 kHz)

Crosstalk R to L –98 dB (1 kHz) –74 dB (20 kHz)

L to R –102 dB (1 kHz) –80 dB (20 kHz)

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Schema preamplificatorului :

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Teorie 1

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Teorie 2