car stabiliser

Together with the "ordinary" three pin regulator IC"s a few different types for special use are becoming available. The LM 2930 National was primarily intended for use in the car, but it also has other applications. The IC has a few quite useful characteristics, such as the fact that the difference between input and output voltage need only be 0.6 V. Changing the input voltage"s polarity is no longer a disaster and short voltage peaks of up to 40 volts cause no damage. Other character- istics include voltage limitation and 8V 5V thermal protection and although useful, are less spectacular. Since the output voltage is 5 volts (there is also an 8 volt version) and the maximum current is 200 mA, this regulator will be ideal for use with instruments (speedometers, computers) rather than in audio. The circuit is extremely simple. Both capacitors have to be mounted close to the IC in order to prevent oscil- lation. In most applications the IC must be mounted on a heatsink; this can be c...