motor moment project

[alec_t]

do you think i need a voltage regulator because the measured voltage is 28v DC and it sometimes are lower and higher.

When you said originally that you had 24V available I took you at your word . In the circumstances it would be better to use a regulator. I would suggest a LM317L. I'll redraw the circuit to include one and show the CD40106 pin-out.

 

[perjan6666]

sorry my bad, ti was written on the transformer 24V but i measured 28V an ti was not completely stable

thank you again

 

[alec_t]

It was written on the transformer 24V

But a transformer works on AC. So is that 24V AC ?
However, do you need to use the transformer? The Mitsubishi controller has a 24V output terminal (PC) which is specified as able to supply up to 100mA (much more than my circuit design would draw).
Attached is the revised design and parts list.

 

[perjan6666]

it have a rectifier included but i also have a 12 volt transformer DC if the circuit have a voltage regulator on 5V i can choose between the power sources right?

 

[alec_t]

if the circuit have a voltage regulator on 5V i can choose between the power sources right?/QUOTE]The Mitsu controller has a regulated 5V source already, which I assume can be used to drive the timing circuit. However, the digi-pot output impedance (10k) is probably too high to provide the speed control voltage drive directly, which is why I have included the LM324 buffer stage in the design. To enable the full 5V drive range to be achieved the buffer stage needs a higher supply voltage than 5V; hence the 9V regulator in the revised design.
You seem reluctant to use the existing 24V Mitsu controller supply

 

[perjan6666]

the digi-pot dos not need voltage and ground on the output i think because that is provided by the frequency converter

 

[alec_t]

Yes, the Mitsu frequency converter provides the +5V (Va) and ground (Vb) for the digi-pot. As I said, "The Mitsu controller has a regulated 5V source already, which I assume can be used to drive the timing circuit." It also supplies the digi-pot part.
The digi-pot is 10k (50k or 100k versions are also listed), but the frequency converter is designed to work with a 1k pot and has an input impedance of only 10k. That is why the buffer opamp is suggested, to provide a low-impedance drive (Vw) from the digi-pot wiper.

 

[perjan6666]

ok i understand then i will use the milliamp solution

 

[perjan6666]

halo agein my scope has arived so i just need the last drowings and i will try it out