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Posts posted by q12
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hy
if you have done the problem whith your HBridge please post-it (the right solution).
i have a same problem my 2 Q on diagonal they bases dont open to let the curent/voltage flow to ground. Still in separated way they work fine themselves. -
>:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( >:( if you dont see the image below click on the link or download the .rar arhive of my photo. k? :P
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it means if you Touch the led emited Light the Switch will open/close the Light in my room.
BUT. it not work.
My blue led is damaged from unknow couses, if i put-it like in this image. ' alt='' class='ipsImage' >
in time he iluminate and the ideea work.
If i put a led from 220v, it is not bright enough to iluminate the LDR.
i am disperate.
what can i do to make it work? i mean not to damage itself / or/ iluminate enough .
i think it may be necesarily to overplan the concept. -- redraw-it.
maybe the on-off part shoud consuming a litle I or V.
if you have an ideea grab photoshop and draw-it corect.
thank you and excuse-me for my poor english. :'(
Problem in an H-Bridge
in Electronic Projects Design/Ideas
Posted
here
i used this circuit.
But i have some trouble from Q1 and Q2. they are super heat up.
I put on them some heaters/radiators but still they are warm.
finaly i reach to conclusion that they need a fan.
and they are steady finaly (from over-heat point of view).
i try to put some resistors on base or colector but the current flow are seriously diminish. the motor not run.
i use BD 441 NPN-transistors and they hold out 80V and 4A. i think this kind of transistors are much over the circuit requirement (they are very good). still they are heat.
in my opinion i think they heat because they are over-feed whith V or A because they are first in circuit.
if you have an response to how can i exclude the over-heat from Q1 and Q2 i will be thankful.