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Old 23rd May 2007, 03:19 PM   #1
Default H-bridge Circuit

Hi guys,

I am new here and I would like to consult you guys on this h-bridge circuit. http://electronicsworld.tripod.com/motorimages/3.gif

Could somebody kindly explain to me the purpose and function of Q1 and Q2? Thanks.
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Old 23rd May 2007, 03:38 PM   #2
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They are open collector inverter/buffers - basically they interface the 5V logic to the 9V supply for the H-bridge.
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