12v reverse speed control circuit diagram

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Discussion Overview

The discussion focuses on designing a circuit for controlling the speed and direction of a 9v motor, which can operate up to 24v. Participants explore various circuit diagrams and components suitable for achieving this control, including the use of a dual-potentiometer.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant requests assistance in creating a circuit diagram for speed and direction control of a motor, indicating this is their first circuit-building experience.
  • Another participant suggests a circuit involving a 555 timer, noting an unusual output pin configuration and recommending a double pole double throw switch for reversing motor direction.
  • A third participant introduces the LMD-18200 full H-bridge as a potential solution for forward-reverse control with pulse width modulation (PWM) for speed adjustment, asking for more details about the motor's specifications.

Areas of Agreement / Disagreement

Participants present different circuit solutions and components, indicating multiple competing views on how to achieve the desired motor control. The discussion remains unresolved as no consensus is reached on a specific circuit design.

Contextual Notes

Details about the motor's ratings and specifications are not fully provided, which may affect the applicability of the suggested solutions. The discussion also lacks clarity on the specific requirements for the dual-potentiometer integration.

Who May Find This Useful

Individuals interested in motor control circuits, hobbyists building their first electronic projects, and those exploring PWM and H-bridge applications in robotics may find this discussion relevant.

terencep
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Hi

I have a 9v motor (can run to 24v). I need to control the speed of the motor and reverse the direction. I also wanted to control it with a duel-potentiometer, but i can't seem to find any way to do this. can someone help with a circuit diagram please?
(This is my first time building a circuit so any help you can offer please)

Thanks
Terence
 
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This shows a circuit that looks like what you need.

http://www.dprg.org/tutorials/2005-11a/index.html Note that the output is taken from pin 7 which is unusual but OK in this circuit. Pin 3 is normally the output of a 555.
That would give you variable speed and you would need a Double pole double throw switch to change the polarity of the voltage getting to the motor to reverse its direction.

100px-Crossover-switch-symbol.svg.png


The motor would be on the right and the input voltage on the left in this diagram.
 
Last edited by a moderator:
This National Semiconductor LMD-18200 full H-bridge offers full 3-amp 24-volt forward-reverse pulse width modulation w/braking.You can probably use the PWM to control different motor speeds in forward and reverse. You can also do it with diodes and pots on the output.
http://acroname.com/robotics/parts/R27-18200.pdf
Tell us more about the motor rating.
 
Last edited by a moderator:
Thanks for the help.
 

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