Hello. I am interfacing a 12V stepper motor to my 5V microcontroller. I have this image from a textbook of mine, which is attached. As you can see, it says to use one power supply for the ULN2003 and motor and another for the 8051. My question is exactly what does this mean?
I am in the process of building a 120VAC/DC converter using the standard transformer, bridge rectifier, and a smoothing capacitor. The output of the capacitor will be approximately 12V with VA rating of the xfmr large enough to supply current to both the motor and control circuitry. I then wanted to use a switching regulator buck converter to convert the +12V to +5V with 300mA Iload capability to power my 8051.
Can I use this 1 transformer, 2 voltage level design to power both my 8051 and my motor? Or do they need to be totally isolated, meaning I need 2 transformers with the 12V and 5V turns ratios?
If this method will work, I am having trouble finding a 12V linear regulator (3 terminals) with over 1.5A capability, any suggestions?
Thank you in advance everyone.
I am in the process of building a 120VAC/DC converter using the standard transformer, bridge rectifier, and a smoothing capacitor. The output of the capacitor will be approximately 12V with VA rating of the xfmr large enough to supply current to both the motor and control circuitry. I then wanted to use a switching regulator buck converter to convert the +12V to +5V with 300mA Iload capability to power my 8051.
Can I use this 1 transformer, 2 voltage level design to power both my 8051 and my motor? Or do they need to be totally isolated, meaning I need 2 transformers with the 12V and 5V turns ratios?
If this method will work, I am having trouble finding a 12V linear regulator (3 terminals) with over 1.5A capability, any suggestions?
Thank you in advance everyone.
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