DC Motor Control Circuit
Notes: 
 Here, S1 and S2 are normally open , push to close, press button switches.  The 
diodes can be  red or green and are there only to indicate direction. You may 
need to alter the TIP31 transistors  depending on the motor being used. Remember, 
running under load draws more current.  This  circuit was built to operate a 
small motor used for opening and closing a pair of curtains. As an  advantage 
over automatic closing and opening systems, you have control of how much, or how 
 little light to let into a room.  The four diodes surriunding the motor, are 
back EMF diodes. They  are chosen to suit the motor. For a 12V motor drawing 
1amp under load, I use 1N4001 diodes.
        Title: DC Motor Control Circuit
        electronic circuit
        Source: www.electronics-lab.com
        Published on: 2005-02-03
        Reads: 2713
        Print version: 
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