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the problem that i am facing right now is that, i couldnt find the transistor NTE262 and TIP110
also i have attached on the jpg format hope that this wont create any problem viewing.
uncle_sam said:but my mentor told me to use 2 555 timer at the output of the h-bridge and then to connect to the motor.
uncle_sam said:since i dont see any logic behind using the 555 timer at the output.
Styx said:I dont like, you cannot ensure that the two 555 timers are syncronised.
adminidly with this design you cannot get shoot-throughs (be it demanded or switching).
Styx said:If it doesn't use the 555 (a good way to generate PWM) and then via an inverter chip/gate pass the output though the inverter.
You now have a NON-INVERTED and INVERTED PWM, feed these two signals into each input will do the job
Nigel Goodwin said:Using two 555's like that is a complete receipe for disaster! - it's bound to turn all four transistors on at the same time, blowing all four transistors, and possibly causing other damage as well (depending on the supply).
I can't believe anyone would tell you to do it that way!, perhaps you misunderstood?.
Styx said:Yes using two 555 is a very bad idea, but as I stated, this topology is the safest one for it to accedently done two.
The phase-legs are in a PUSH-PULL configuration, thus only one transistor per leg will be on => no problem.
....and if the right voice is there, then to run the motor to open the door or close.
eblc1388 said:....and if the right voice is there, then to run the motor to open the door or close.
Logic inverting one signal to get another has one minor disadvantage. The motor will never stop.
You will need two independant input signals to start/stop the motor.