Hey all,
I want to convert a battery powered siphon pump powered by 2D cells (3v) to run off a 12v marine battery (12v 55Ah AGM). Some online research led me to the voltage divider circuit, and how to use ohm's law to figure out the resistance needed. But under load things change since the load adds a parrallel resistance, so at a minimum I need to figure out how the load will change the circuit. Now I can find the resistance of the motor easy enough by measuring its windings but I suspect there is more to it than that. Also there is the issue of current. I suppose I need to know how many amps the motor draws so the necessary circuit current can be determined, and that will tell me the resistance I need for r1 and r2, as well as their watt rating.
If you can't tell I have no circuit design training or experience but this seem like a doable project, so I guess I'll ask some questions now.
Is the votage divider the best circuit for this application?
Is so so did I misunderstand anything about the problem?
I can run the motor under load and measure it's current draw, but is the resistance it adds to the circuit just its winding resistance?
Did I forget to ask something I need to know?
And while I like projects and figuring things out if someone knows exactly how to build such a circuit I will gladly accept that as well!
Thanks!
I want to convert a battery powered siphon pump powered by 2D cells (3v) to run off a 12v marine battery (12v 55Ah AGM). Some online research led me to the voltage divider circuit, and how to use ohm's law to figure out the resistance needed. But under load things change since the load adds a parrallel resistance, so at a minimum I need to figure out how the load will change the circuit. Now I can find the resistance of the motor easy enough by measuring its windings but I suspect there is more to it than that. Also there is the issue of current. I suppose I need to know how many amps the motor draws so the necessary circuit current can be determined, and that will tell me the resistance I need for r1 and r2, as well as their watt rating.
If you can't tell I have no circuit design training or experience but this seem like a doable project, so I guess I'll ask some questions now.
Is the votage divider the best circuit for this application?
Is so so did I misunderstand anything about the problem?
I can run the motor under load and measure it's current draw, but is the resistance it adds to the circuit just its winding resistance?
Did I forget to ask something I need to know?
And while I like projects and figuring things out if someone knows exactly how to build such a circuit I will gladly accept that as well!
Thanks!