I find plenty of them. Maybe your Google is broke?

Ron

Thank you I didn't see that one. I'll try it out.

 

I got this to work partially
The result can be seen here: https://www.youtube.com/shorts/8A2Q6s6pzZA

The motor some times steps backward. I have checked the polarities of the wires and it should be OK. I think it can be confirmed by watching the video. It shouldn't be able to run more than 4 steps without stepping backwards if there was at problem with the polarities or a mis-connection, right?

 

oh I found out it has something to do with the voltage. If I lower the voltage to about 7 volts it doesn't step backward.

 

oh I found out it has something to do with the voltage. If I lower the voltage to about 7 volts it doesn't step backward.

Are you using the circuit shown in post #17?
Do you have an oscilloscope to view what's going on?
You could have massive spikes on the transistors as they turn off. You need to have a fast diode going from each motor coil to both 0V and V+ (reverse biased, cathode to +V in each case) to catch the spikes, otherwise they will eventually kill the transistors. Those transistors are not rated for 1.7A either.

 

I am using the circuit from #20 I'll post it here



I can swap the 4001 to 4148 and put in mosfets instead of transistors

 

I am using the circuit from #20 I'll post it here
View attachment 289586


I can swap the 4001 to 4148 and put in mosfets instead of transistors

I see, different circuit!
What is the layout like?
I like to put thick power lines to the driver driver section power and grounds, and take separate power and ground to the counter/timer parts, commoning them at the PSU, with a big electrolytic across the motor supply section.