I want to thank Harry for helping me with the "PWM/Jet Engine project", now on to some other issues that may be taken care of in the learning process of this project. Included with this thread is a copy of the circuit that I am using but, I have changed some of the values for the components because of my design needs.
Here we go!
In this circuit the author used a 250k pot for the output voltage control along with 1k resistors on each side of the pot for a min resistance to this part of the circuit. What I have is a 50K slider that I am using for the throttle control and I need the full range of this slider so that there is a more positive control of fuel to the engine. It seems as though I do not get any response until the slide is about half way through and then it will go to full at about 3/4. So there is a small area that I have to work with. I did check the slider values and it does register an increase of resistance the way it was designed. I have also change the electrolytic cap to 10mf that is shown in the schematic, which allowed me to run the lager DC motor driving the fuel pump. The final change was adding a lm7812 regulator so I can drive the Mosfets at 24 volts and not burning out the 555 timer.
What I am looking for is formula or circuit designs that will accommodate the slider variable resistor so that I can have a full range of output voltage to what ever I am driving at input voltages of 12 - 24 volts.
Thanks
Steve
Here we go!
In this circuit the author used a 250k pot for the output voltage control along with 1k resistors on each side of the pot for a min resistance to this part of the circuit. What I have is a 50K slider that I am using for the throttle control and I need the full range of this slider so that there is a more positive control of fuel to the engine. It seems as though I do not get any response until the slide is about half way through and then it will go to full at about 3/4. So there is a small area that I have to work with. I did check the slider values and it does register an increase of resistance the way it was designed. I have also change the electrolytic cap to 10mf that is shown in the schematic, which allowed me to run the lager DC motor driving the fuel pump. The final change was adding a lm7812 regulator so I can drive the Mosfets at 24 volts and not burning out the 555 timer.
What I am looking for is formula or circuit designs that will accommodate the slider variable resistor so that I can have a full range of output voltage to what ever I am driving at input voltages of 12 - 24 volts.
Thanks
Steve
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