June 4th, 2007
The volume control is primarily for insertion between a car audio and its booster. It automatically adapts the volume to the amount of road and engine noise. This is done in four 5 dB steps based on the measured sound pressure in the interior of the car. This means that the volume can be increased by up to 20 dB with respect to the set volume level. Care should, therefore, be taken to ensure that the booster and loudspeaker do not become overloaded.
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Posted in Audio, Uncategorized | 3 Comments »
June 4th, 2007
The alarm is based on the fact that when a car is broken into, at least one of the front doors has to be opened. When that happens, the interior light comes on and this cause a slight temporary drop in the battery voltage. The present circuit detects such a drop and when it does so sounds the alarm. Read the rest of this entry »
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June 3rd, 2007
The LM3886 from National Semiconductor is a high performance 150W audio power amplifier with mute. Its performance, using the self peak instantaneous temperature (SPIKe) protection circuitry, is better than discrete and hybrid amplifiers since it provide and inherent, dynamically protected safe operating area (SOA). The LM3886T comes in an 11 (staggered-) lead non-isolated TO220 package.
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