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  1. andrewg85

    magneic braking for bicycle

    You could use an electric motor strapped to the back wheel with the appropriately rated variable load connected to the terminals. They serve as both motors and generators so that should work without any problem. Could also use some truck batteries to power the motor and disconnect the variable...
  2. andrewg85

    Effects of 400HZ on power supplies.

    The basic functioning of a switchmode power supply: The input power is rectified from AC into DC. So if you input 240Volts AC you get 240 Volts DC (minus 0.6 volts in the rectifier diodes) The DC is then switched on and off at a high frequency to go through a transformer (as transformers do not...
  3. andrewg85

    How to integrate batter/charger into portable unit

    Hey Showcaser, the best way to go about it would be to put a connector going into the carry case for a battery charger, that way the carry case can just be plugged into the charger overnight. Modifying the charger - you can use a quick connector (such as one off a DC plugpack). Just take the...
  4. andrewg85

    Adapting an old Computer Power Supply

    I have tried using an AT power supply just to power a cd rom drive connected to a radio as a cd player and that works without any trouble. There was no load on the motherboard connectors (which also includes 3.3 volts). Tested with a multimeter and the 12 volt and 5 volts were correct. This was...
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