Sunday, January 10, 2010
30 W AMPLIFIER FOR CARS
Design by T. Giesberts
ELEKTOR ELECTRONICS MARCH 1995
The power that can be obtained from a standard car radio amplifier operating from a 12 V car battery is 5–6W, which (for many listeners) is not really enough for satisfactory hi-fi reproduction. It is, of course, possible to boost the 12 V supply with a power inverter, but that is fairly expensive and not always acceptable. Now, a Philips IC enables audio power of about 30 W to be obtained from a 12 V car battery. MORE...
Technical Data
Class H operation
Low dissipation with music signals
Extensive protection circuits (output current; temperature; load impedance)
Supply voltage 12 V nominal
Quiescent current 100 mA
Output power
(1 kHz sinusoidal, THD = 0.5%) 30 W r.m.s. into 8 Ω
(music signal) 40 W into 8 Ω
THD + noise (1 W into 8 Ω = 0.05% (20 Hz to 20 kHz)
THD + noise (20 W into 8 Ω = 0.2% (20 Hz to 20 kHz)
Power bandwidth (–3 dB) 5 Hz to 100 kHz.
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