Hi all, First I should say I know almost nothing about what I'm talking about.
I'm designing a power supply I need some kind of variable voltage (like a PWM with a filter or a pot) to control an opamp that gives it gain then that controls the voltage regulator(refer to attachment). my power supply is 0 to 30volts so a 1 torn pot is not going to work because if I breath on it and it will move 500mv. So I was trying to find away to use two pots fine and course but I'd like to have the fine pot have control of about 1 volt on all ranges. Or have some kind of rotary encoder.
Any way you can think of to be able to easily have fine control of the hole 30volt range
my main problems are:
I'm try to keep this part of the circuit under $5.
I know nothing about Microcontrolers and Dac's and that sort of thing.
I don't want to have to work with software.
This is my first (big) project so I'd like to keep it semi simple
And if you could you could give me a diagram that would be very helpful.
Thank you.
I'm designing a power supply I need some kind of variable voltage (like a PWM with a filter or a pot) to control an opamp that gives it gain then that controls the voltage regulator(refer to attachment). my power supply is 0 to 30volts so a 1 torn pot is not going to work because if I breath on it and it will move 500mv. So I was trying to find away to use two pots fine and course but I'd like to have the fine pot have control of about 1 volt on all ranges. Or have some kind of rotary encoder.
Any way you can think of to be able to easily have fine control of the hole 30volt range
my main problems are:
I'm try to keep this part of the circuit under $5.
I know nothing about Microcontrolers and Dac's and that sort of thing.
I don't want to have to work with software.
This is my first (big) project so I'd like to keep it semi simple
And if you could you could give me a diagram that would be very helpful.
Thank you.
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