Yaakov - without being rude, you have no idea what i have learnt in the last 12months regarding circuits, dc voltage, hall effect etc. i am a complete novice when it comes to electronics although am searching the internet to learn as this has now become a new hobby for me and thought this forum was to help people like me that has an interest to learn. i find this forum very informative as im learning from people that has experience and knowledge.
im sorry that i didn't comment/acknowledge your post above although i am grateful for everyone that responds to my questions

i have taken notes to look up rheostat and op amps to learn more as it could help me in the future with other projects that i have planned

i hope that this doesn't discourage you from helping/supporting me (or anyone else) in the future

take care
Sam

Hello, Sam.

I wasn’t really being critical. My comment was an observation. You are very focused on immediate, practical results. It is my opinion that you would be bette served stepping back and learning something about the bigger picture concerning the system you rate working with so you can make a more informed decision about how to proceed.

From a practical point of view, I gave you the best advice I could figure out how to do, but since you presented me with a problem (how do I get what i want by doing something I’ve chosen to get it) while explaining a goal that might not be best served by solving that problem, I did my best.

I am glad you are learning, that’s great! I admire your willingness to jump into the unknown and complicated mess of practical circuits, and, knowing what I know, my advice is, learn a bit more before choosing the way to do what you want. There’s nothing wrong with following your intuition and failing, that’s part of learning.

I’ll also point out that you are not crazy or stupid, and your intuition wasn’t outrageous. It just wan’t informed, and so could be painting you in a corner or have unknown side effects which could be avoided with a more informed approach.

Nothing I have said or am saying is intended to dismiss or discourage you! I respect your autonomy and some folks simply choose not to pursue anything more rigorous (“as long as it ‘works’, I’m good”), and in that case, there is a limit to how help can be given.

I am very sorry if I seemed critical or discouraging, you are a hobby hero. Keep it up! Most of all have fun!

 

@Rangerover I think what Yaakov is trying to say is that to him (and this is MY opinion) you have decided on how to solve a problem and then are asking for that particular solution. He's observing a person who has settled on one and only one solution to a problem, when with his experience and knowledge he thinks there is a better solution. OK, he sees a different solution. So do I.

A wise person will take in more information before making a decision. And he will not be so quick to dismiss what others have to say. The person who surrounds himself with intelligent people will come off a winner, whereas hanging around with the uninformed will lead you to disaster.

OK, I admit I lack the knowledge on how to approach this. I think a linear HET (Hall Effect Transistor) can be used. But I also think that it would have a very short range of motion between full off and full on. But again, I don't "KNOW" this to be a fact. But if I were tasked with solving the problem USING a HET I think I would try to combine with PWM (Pulse Width Modulation). Others will likely disagree and say there are motor controllers for this very purpose. Again, I lack the experience and knowledge base to comment more fully on this. However, just tinkering about on my workbench, I've come up with ways to control small motors. CD Player motors and old tape deck motors. Certainly not the kind of motor you want to control.

My advice: Consider what others have to offer. Doesn't mean you MUST accept their point of view; but you will come off richer for the experiences.

 

I've never heard of a 'Hall effect throttle', but there are Hall sensors with analogue outputs, so one of those with a moving magnet could be the basis of a throttle.

Certainly, there are indeed linear hall effect devices. And setting a maximum drive level of a PWM controller would be quite independent from whatever device is used to provide the input control signal. The hall sensor signal will need to be amplified and so a control after the amplifier can be used to limit the maximum drive to the PWM portion of the circuit. See another thread where the TS wound up using 2 PWM controllers to operate a hydrostatic transmission for an example of how simple it can be.