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21 lines
860 B
Markdown
21 lines
860 B
Markdown
# Hardware
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## LTSpice simulation
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By modifying the $R_{cal1}$ resistor we can see that the maximum output voltage can go up to $5V$. The goal would be to modify this resistor value to have a maximum output of around $3.3V$:
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#### Calculate $a$
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$$a=\frac{\Delta{y}}{\Delta{x}}=\frac{y_2-y_1}{x_2-x_1}$$
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$$AN: a=\frac{10k-1k}{2.1-4.94}$$
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$$AN: a=-3170$$
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#### Calculate $b$
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$$y=-3170x+b$$
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$$1000=-3170(4.94)+b$$
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$$b=3170(4.94)+1000$$
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$$b=16659$$
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#### Numerical Application
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$$y=-3170x+16659$$
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We can now calculate the resistor $R_{cal1}$ to have $3.3V$ in maximum output with the previous formula, we find:
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$$-3.17\times{10^3\times{3.3V}}+16.7\times{10^3}=6.2k\Omega$$
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> Has we can see with the LTSpice simulation, we have the correct maximum voltage, it does not go further than $3.29V$ which is exactly what we wanted.
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## Electronic CAD
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