Whoops, forgot to include the schematic.
QuoteWhoops, forgot to include the schematic.Is that actually a H bridge?
So, what i've got here is one of the sources for an h-bridge i'm working on, isolated from the rest of the circuit for testing
There's a flyback diode installed between Vout and +V that I neglected to include in the schematic, but I don't think that has anything to do with it.
is why the voltage drop between +V and Vout is only around .5 V, when Vce of Q2 and Q3 are far greater than that.
3.3v is very low to be driving an H bridge made from bipolar transistors. Power transistors typically have Vce(sat) figures of 1v or more at a few amps. If you really need to use such a low voltage supply and motor, I suggest using mosfets instead. You can get P-channel mosfets that are good with gate drive voltages down to 1.8v. The only snag is that all the ones I can find are designed for surface mounting (mostly SO-8 packages), so they are a little tricky to solder.Mosfets generally incorporate reverse diodes between drain and source, so in a full H bridge configuration you don't need any extra flyback diodes.