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Subject: help on frw/rev switch for full-bridge motor control

Date: 08/22/00 at 5:56 AM
Posted by: Michel St-Louis
E-mail: michelst@cae.ca
Message Posted:

I am learning electronic and I did a full-bridge motor control
for a DC 12v motor via the paralel port using optoisolator (MCT6),
Has every body know that a full bridge have 2 inputs, one for
forward and one for reverse, and because a paralel port is
limited to 8 outputs, I intend to use only one line to select
the direction, by default, the forward is on. I need to design
a switch (not using a relay) to control the direction of the motor.
I need help to desing that sort of not-gate but for 12v DC (300mA-500mA).
What should I use do that kind of circuit ?

| /
| o-|not gate|----| 2N2222 (NPN)
| | \
| / | o--- forward
o-./ .----o--------- reverse

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