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Cruschow's condition, "if the 32V is DC," may have slipped past you. Are you certain it is DC? Do you know what DC means? What is the source of the 32VDC?
John
Both the 0.1uF input capacitor and 1uF output capacitor are to insure that the LM317 remains stable (doesn't oscillate). They should be mounted close the the regulator pins.
Why not just put a 160 ohm resistor in line with the buzzer (works for AC or DC)... 160 ohm * 10mA = 16V dropped across resistor, 16V across buzzer.
I*I*R (power) would be 16 milliwatts through the resistor.
Do you know ohms law?Will a 160Ω resistor really drop it down from 32-16V? Seems rather low.
Thanks, it's good to understand how it works.
Will a 160Ω resistor really drop it down from 32-16V? Seems rather low.
1.6K ohms is a standered value for 5% resisters.
Now if the buzzer draws 10ma how much power do you think the resistor will need to dissipate?
How did you come up with a 1/2 watt resister thats 0.5 watts you only need 0.16 watts.
A 1/4 watt would work. It is 0.25 watts.
Yes I get that too 16v/0.01a = 1600 ohm, a 1k5 is nearest.
Yes...1/4 watt would work...I just derated 100%.