Adam ,

I went through this several months ago I even tried separate
transistors didn't get good result I wouldn't bother making
it I found  good IC driver made by Cherry Semiconductor
part number is CS-298 it has dual H-Bridge drive very easy control .
can handle up to 2 amps per channel excellent part. you can get a sample from

Sager electronics http://www.sager.com


Andre Abelian




Adam Bryant wrote:

> I recently picked up a number of 2N5192's surplus and would like to use
> them to construct an H Bridge motor controller (controlled from a PIC of
> course).  The motor I will be driving will draw around 1.5A.  My power
> supply is a 12v 5A battery.  The problem (if I read the datasheet
> correctly) is that the "Collector-Emitter Saturation Voltage" of the 5192
> is specified as Ic=1.5Adc, Ib=0.15Adc.  As I understand this, for my
> Collector-Emitter current to be the 1.5amps I need to drive the motor, I
> need to drive the Base with 150mA. Is this correct?  So my thought was to
> add another transistor between the PIC and the 2N5192's to amplify the
> signal from the 20mA the PIC can source to the 150mA needed for the
> 2N5192.  Seem reasonable?  Are there any other options for doing this
> using the 5192's?  I would hate to have to use 8 transisitors per motor
> H-bridge.
>
> I'm not emotionally attached to the 5192's, so if there is another option
> that is easier, let me know.  I do recall a discussion a few months ago
> about logic level MOSFETs (IIRC).  If these would be easier, let me know
> a part number and I will pursue that angle instead.
>
> Sorry for the basic electronics questions, but I am a programmer by
> training and electronics are a hobby I have picked up along the way.
>
> Thanks,
> Adam
>
> Adam Bryant (age 0x23)
> abryant@peaktech.com (work)
> adamdb@juno.com (home)
> Parker, CO, USA
> Robotics, RC Airplanes, anything using a PIC
>
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