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H-Bridge Made With A ULN2803 Peripheral Driver

2016-05-15 12:09  
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H-Bridge Made With A ULN2803 Peripheral Driver
This is not a good design for an (or is it 'a') H-Bridge circuit but it's simple and will work well for low current loads. The diodes in the base circuit of the PNP transistors might be needed to allow them to cut-off. The resistor in the base circuit depends on the gain of the transistors. A resistor from B+ to the top of the diodes may be needed as well. The circuit as shown, was tested with a 10 volt supply driving a Tortoise® switch machine with series direction indictating LEDs.