I am interested
to follow the output stage exactly as given in your square wave design. I
want you to include all the MOSFETs - NP as well as PN along with the buffer transistors and their base resistors.
logic is very simple, if the output stage is responding and working
well with the signals from the IC 4069, it should do the same with the
signals from the 4017 ICs, after all both the designs are producing
square waves (our design is producing a chopped one though.)
voltages that you are getting are absolutely fine and the differences
are too trivial to produce any effect on the circuit, moreover, very
unlike the transistors, for MOSFETs its the voltage that matters and not
the current and that's why the buffer transistors become very important
and must be included.
I think it will be also important to include 10K resistors from the base of each buffer transistor to GROUND.
won't be able to help you with the MOSFET types, as I myself am not
quite knowledgeable with these devices, but the above modifications
should hopefully set things in the right order.
Thanks and Best Regards.
with one that has a higher collector current. Would that make a difference
resistors, because there already is a 10K resistor from the 4069
to the base of the buffer transistor, so you want me to add another 10K
from the Base to ground , correct ?
stage works with the Square wave circuit , with some minor changes our
PWM circuit should work also.
I think we better stick to the tested design given below, so let's
follow the circuit as given in your square wave design... we can always
modify it once it starts working.
That's correct... The 10K
resistor from the base of the transistors to the ground will ensure that
every time the diodes stop conducting the base receives a ground or a
low logic level and switches OFF completely.
Yes..of-course, if it starts working then the issue gets over and we won't need to include the PNPs.