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Here is a really useful trick for a H-bridge. This H-bridge was find on the Internet on the BEAM  Yahoo group.

*****Thanks to Bill Bigge for the trick.*****

Don't forget tho visit is web site

What to do, went you have the electronic of a servo motor?
You make a motor driver!
Here is the H-bridge IC BAL6686
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You desolder the IC chip call  BAL6686

Here is the pin layout of the IC
You connect the motor directly on the chip.  You can power
the IC  chip with 5 Volts.  For the Input voltage, 5Volts is OK.
When connecting the IC chip to 5 Volts, put a 1K resistor
to the Vcc.
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©2001 Jérôme Demers. All rights reserved.