q12

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.

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 ' alt='' class='ipsImage' > 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. :'( intrerupator_optic1_.rar