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stepper motor

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jim bro

New Member
hello,
I am trying to remote control a stepper motor.For receiver i use a receiver module with a decoder HT648L(Holtek).Because my stepper is unipolar my driver has a translator(74ls157 as multiplexer and 74ls74) and 4 transistors tip110.I have a strange problem:Everything work fine,when a hi appears in decoder's out the translator works perfect and the driver with the transistors too.But everything works fine without the stepper motor.When i put the stepper in the driver output happens something that i cannot explain.When i give a hi from the transmitter at the receiver,at the decoder output appears a hi and the stepper starts working.But when i give low from the transmitter at the receiver there is again hi so the stepper keeps working.Can anybody explain it?
 

chriswatts19

New Member
may i suggest not using the 74157? i had to do a project on stepper motors recently at uni and using the D-type flip flop with the multiplexer proved unstable and produced hugely variable results, may i suggest an ex-or and JK or Ttype flip flop combination? perhaps using CMOS instead of TTL because of the better voltage capabilities (can run on slightly more unstable voltages and higher voltages so can therefore run of same voltage needed to power stepper motor [up to 15V]) if your unable to get the circuit diagram, email me ( [email protected] ) and ill send you the circuit diagram.
:)
 

pdl55

New Member
check the power supply

always that there are things like that may be a feecback though the power. use a higer voltage to drive the motors but ALWAYS usa a separate regulator for the logic. the motor generates a lot of noise with its consuption and you will never know what kind of unstabilities can cause. good luck
 
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