Subject:
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Re: high current motors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 19 Apr 1996 22:08:53 GMT
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Original-From:
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Jeff Keyzer <jkeyzer@calwebAVOIDSPAM.com>
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Viewed:
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3865 times
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This is a repost of a message I sent a few days ago. It bounced
back to me, and I don't think it ever made the list...
>
> > The motor connector has three pins they are actually Motor A, V+,
> > Motor B. Normally they are all at V+ when the motor is "off" (the
> > motor is simply monitoring the difference between Motor A and
> > Motor B. When you "turn on" the motor either Motor A or Motor B
> > (depending on direction) goes to ground potential, and the motor
> > sees the voltage difference and runs.
> On the handy board, this is different, isn't it? I didn't think
> that the center pin was V+... In fact, isn't it not a connection at all?
>
> > Now connect the emitter of one 2N2907 to the base of Q1, connect
> > the emitter of the 2907 to a 180 ohm resistor and then connect
> > the resistor to the base input of Q4. Do the same thing with
> Isn't this supposed to read, "Now connect the COLLECTOR of one
> 2N2907 to the base of Q1, connect the EMITTER of the 2907 to a 180 ohm
> resistor..." The way it's written just doesn't seem right.
>
>
> Also, would it be possible to create a similar circuit using
> non-darlington transistors, such as TIP 31 or 41's and their PNP
> counterparts? They are much more readily available to me!
>
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