I am trying to incorporate several designs together to form a functioning system first I have a schematic (du9CL.gif) which I modified. I removed the Fet's and replaced with a L293D. The original circuit uses a clock signal feeding to the clock inputs of the JK flipflops and a Quad XOR gate sets the timing and has a directional input to reverse the motor. my problem is in connecting the CD4027 to the L293D. I will upload my schematics as soon as they let me.
Hi @rodder.
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Which stepper motor.
The L293 is a dinosaur brushed DC motor driver, not a stepper driver.
Most modern stepper motors require a current controlling driver.
Only high impedance motors can be driven at low step rates with common H-bridges.
Leo..
2 Likes
Big mistake. Do not do this.
As Leo says.
I am trying to reproduce the actions of a MC3479 stepper driver. this device uses a clock signal and a direction signal to generate the pulses for each coil of a bipolar stepper. The processor has a very complex program to generate the pulses for two steppers and four directions and four different speeds. Back to the dinosaur , it's data sheet does indicate that can be used as a driver for a bipolar stepper.
Mike, the FETs were replaced with the L293 (still a dual H Bridge)
Also the stepper is a 42PM48L BZ stepper which was factory modified into a bipolar stepper.
As stated in post #3, but only for certain types of steppers and always with considerable waste of energy.
42PM48xx seems to be a family of high impedance steppers, so the L293D could work.
Leo..
I would not call 5.8Ω high impedance.
42PM48L01.pdf (133.1 KB)
And
Would have been good to know from the start, as would be to see your circuit. You were advised in post #2 that you could attach a type .png file. So why have you not done this. You are keeping us in the dark here.
Was looking at this page.
Leo..
still trying but not having any luck.
What about the schematics you promised.
Try connecting the XOR outputs to 1A, 2A, 3A, 4A and connect the enables high.
Yes but you can loose up to 4V across that dinosaur depending on the current. You do not loose anything like that when FETs do the switching.
We still don't know tthe exact resistance of the stepper coils.
The L293 could bre ok for high impedance/low current motors.
A low impedance motor will fry the chip and/or motor and/or supply.
Please measure the resistance of the coils. This thread is going nowhere without that.
Leo..
IMG_20250423_0001.pdf (226.5 KB)
Hope this helps to figure out my mess ; more to come later
Measured resistance is about 29.6 +- .5 ohms
II am still using a 4027 JK Flip Flop in the circuit.
Try posting in an aspect ratio people can actually read
IMG_20250423_0001.pdf (227.3 KB)
What it is about young people who do not understand aspect ratio? Did you try making sense of this on a desktop machine, or a tablet?