Engineering Resistors in a 555 Timer Circuit

AI Thread Summary
Using a 555 timer circuit to generate a tone at approximately 256 Hz with 22 and 270 Ohm resistors and a 10 µF capacitor may lead to excessive current draw, which can damage the circuit. Higher value resistors can be used to achieve the same frequency while reducing current consumption. The frequency of a 555 timer in astable mode is calculated using the formula f = 1.44 / ((R1 + 2R2) * C), where R1 and R2 are the resistors and C is the capacitor. It's advisable to choose resistor values that balance frequency output and current draw for optimal performance. Understanding these components is crucial for successfully completing the project.
krotan
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I was using a 555 timer circuit to generate a tone the frequency of roughly 256 Hz with resistors of 22 and 270 Ohms and a capacitor of 10 uF but I was advised not to by my teacher and wasn't able to ask the reason why. Can someone kind of brief me on this since my teacher is away tomorrow and this projcet is due soon.
 
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I'm not very familiar with 555 circuits, but maybe the 22 Ohm and 270 Ohm resistors cause a high current to be drawn from the power supply? Can you make the same frequency tone with higher value resistors? What is the equation for the frequency in terms of these three component values?
 

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