By
effekt
Sat Jan 31, 2004 6:04 pm
I really don’t feel like starting a big discussion here, so I’ll try to be short.
Car power supply is just a simple coil with an inverter to generate an AC voltage of 120 volts from DC voltage between 11 and 14. But there is another power supply inside the MPC. So once the 120V enters the MPC, it is converted back to 12 volts, and from there to 5V and 3.3V. So after passing through those 2 power supplies, the signal is very stable.
Of course there are variations, but this is normal. There is no such thing as current which is not varying, and the equipment is made to work in those conditions (CE and SCA standards). In fact even the current from your outlet at home is varying all the time, and those variations are even more significant during the winter, as people turn on and off their heating.
The only time the car power supply should be turned off, is when you start your car. As the starter motor draws current, the voltage at the battery drops down to 8 volts for a few milliseconds. Then as soon as the car starts, the alternator brings the voltage to 13.8V. There is a big variation between 8 and 13.8, and it occurs during a short period of time, so here you should never use your power supply. And That is the explanation why "people always f*** thier turntables up the same way, even non-car dvd players. " So, you are right at some point, but I still think it is safe to you the car power supply, as long as you don't start your car when the equipment is on.
. And I can assure you you will NOT f*** up your MPC with that. The MPC1000 needs 19W to work, so as long as you have a car power supply that is more then 19W, there is nothing to worry about.
