Hi Folks!
Hav earlier asked about a current limiter. Issue solved.
the new problem is, I need to use it for both directions on a DC motor.

And I also need a signal out, going to an other device so I knew the motor stopped.
Today I use two end-position switchers, I would like to exchange them to a current limiter. No risk the motor winds too far or too hard.
Look at the picture

Can I use the same circuit as earlier but connect extra transistors PNP instead of NPN parallel over the others, and vice versa, would that work? So in that case it will work for both directions? Thank You.

 

you just need ONE current limiter. connect it just after battery and before any circuitry that does motor direction reversal

 

Thank You "panic mode"
Well, I change the motor direction/reverse just changing the power supply. So... the rest of the circuit will get wrong polarity - instead of +, the attached circuit picture will not work. The motors I use now with this circuit goes only in one direction.
Now I want to be able to revers them. As long as I can see for reverse direction I need to have an extra circuit and change the transistors from NPN to PNP. Will that work?
But I would prefer to not need two circuit boards but just one. How should that look like? That's the question.
Thanks.

 

Sorry, but it's not at all clear what you mean.
How exactly will you be reversing the motor by "changing the power supply"?
Show a schematic of that.

 

What is the circuit supposed to do? Where is the link to that other discussion? Reversal needs H-bridge or dpdt relay.

 

Oh, I thought it was easy? The motor gets power from a switch, connected just as it is on that picture. Then it rotates. If to hard loaded it stops and will not rotate. Stoped. The circule reset when un-powered or changed polarity. I got a signal out detecting it has stoped.

To get it to rotate reverse I change the polarity in the switch! It is a DC motor!
But then the circuit doesn't work. That is the question/problem.
I need an other, an second similar circuit for the other direction!

Now, see, I would like to not to build/create, soldier together components for a second similar circuit.
I would like to extend this one, make some changes to it. But what?

A simple and maybe functioning solution would be to solder a new PNP transistor across/over the existing ones.
Imagine the power plus/minus has changed places.
Would it work?

 

Something went wrong when editing and re-posted.
Let me explain. imagine the power plus/minus change places. Then imagine the NPN transistors changes to PNP all. Now the motor rotates to the other direction, reverse.
This needs to build/make/create an other almost similar curcuit. I have more motors running this way and lot of job to make thous boards. That's why I'm thinking of a shortcut-way to fix it.

The earlier issue can be find at my nick-name Skalman or this link:
https://forum.allaboutcircuits.com/members/skalman.844314/#recent-content
You can see the same picture/ circuit.
And by the way, the old issue, that circuit has now functioned for a year and saved motors from burning.

 

To get it to rotate reverse I change the polarity in the switch!

Then I don't see why you can't put the current-limiter circuit from the power source at the input to the switch where the polarity does not change(?).

 

Well,......now You said something? Let me think.

If I put an, don't know the english name, "cross-alternation-swith"? direct on the motor, and switch over, alternate, every time I need to reverse motor-, that will function.
Thanks... You waked up a thought by me.But......I control this circuit we are talking about from a programmable -device, a Raspbery Pie computer, so I need a special relay instead of that switcher. A double pole monostabil alternate contact -relay to it and maneuver it from an extra pin out from the Pie. This pin must be "high"/"on" during all the time motor runs reverse pulling and holding the relay.
This is worth a try.
Thank You.

 

It's called a double-pole, double-throw (DPDT) relay.
You would need a transistor driver for the relay coil from the Pie.
Don't forget the diode across the relay coil (cathode to plus voltage) to protect the driver from the coil inductive spike when turned off.

 

Thanks.
I knew all that stuff. I used to be an electronics, math, physics and computer teacher at 9:th class junior-high. Now retired. The name dpdt was what I didn't remember. English is not my first language.

Case solved-closed.

 

If the current limiting circuit is connected closer to battery, and reversal occurs downstream from it (reversing polarity of the motor, rather than battery) then you only need single current limiter, regardless of motor direction.