This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1463811840-107995989-1120239474=:17397 Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; FORMAT=flowed I think that I know of a simpler variant. It works for small motors (not 200mA) but I modeled the attached circuit for motor Ri=22 ohms and L=100mH and it seems to be ok. Be sure to check the waveforms before you switch this driver quickly forward/reverse as it is self-braking on 'stop' (A and B off) (so you don't need the 20 ohm parallel resistor ?). It has some interesting properties imho. I used a pulsed source with Ton=20msec and a single pulse 0/5V, 10usec rise and fall for A, and B grounded for simulation. It is worth your while to simulate it before use. Quiescent current is zero. Attempts to switch a non-inductive load with this circuit may lead to smoke venting although the caps help to prevent that. The caps are needed to prevent oscillation with a L load. Using decoupling across the motor may cause trouble, so don't imho. The circuit has a little positive feedback and may oscillate without the 1n caps and with a L load. Ib for the NPNs will likely be high but manageable by a pic. You could substitute 2N7000 (Rdson=1R) for the NPNs for almost identical performance but save 2 diodes (built in) and zero base current. However then the 1n caps will need some push/pull drive to make it work right. Peter ---1463811840-107995989-1120239474=:17397 Content-Type: APPLICATION/postscript; name=h_bridge_driver.ps Content-Transfer-Encoding: BASE64 Content-Description: h bridge driver Content-Disposition: attachment; filename=h_bridge_driver.ps JSFQUy1BZG9iZS0zLjAKJSVUaXRsZTogaF9icmlkZ2VfZHJpdmVyCiUlQ3Jl YXRvcjogWGNpcmN1aXQgdjMuMgolJUNyZWF0aW9uRGF0ZTogRnJpIEp1bCAg MSAyMToxNDowNCAyMDA1CiUlUGFnZXM6IDEKJSVCb3VuZGluZ0JveDogMCAw IDYxMiA3OTIKJSVEb2N1bWVudE5lZWRlZFJlc291cmNlczogZm9udCBIZWx2 ZXRpY2EgZm9udCBUaW1lcy1Sb21hbiAKJSVFbmRDb21tZW50cwolJUJlZ2lu UHJvbG9nCiUKJSAgUG9zdFNjcmlwdCBwcm9sb2cgZm9yIG91dHB1dCBmcm9t IHhjaXJjdWl0CiUgIFZlcnNpb246IDMuMQolCiUgIEVsZWN0cmljYWwgY2ly Y3VpdCAoYW5kIG90aGVyd2lzZSBnZW5lcmFsKSBkcmF3aW5nIHByb2dyYW0K JQolICBXcml0dGVuIGJ5IFRpbSBFZHdhcmRzIDgvNS85My0tMS81LzA0ICAo dGltQGJhY2guZWNlLmpodS5lZHUpCiUgIFRoZSBKb2hucyBIb3BraW5zIFVu aXZlcnNpdHkKJQolJUJlZ2luUmVzb3VyY2U6IHByb2NzZXQgWENJUkNwcm9j IDMuMSAwCiUKJSBzdXBwb3J0aW5nIGRlZmluaXRpb25zIC0tLSB0aGVzZSBh 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