In a traditional/original receiver circuit. (LM555 timer as oscilator, calibrating a LED)... there should be a 2K ohm resistor. But my lab only have 2,2K ohm resistors. Is it still going to work?
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You can use 2.2k instead of 2k. If that determines the frequency (which I guess it does not..)then frequency can decrease by 10%. If it is in series with an LED (which I guess it is..) then brightness comesdown by an unnoticeable amount.
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If you can pile up 11 of them, you could use 10 in series to make 22k and then put that in parallel with one of them to make a nice 2k resistor out of them. The LM555 isn't usually used as a precision oscillator using precision parts, so it's probably fine that you use a 2.2k, though.
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it's a difference of only 200Ω. a resistor with 5% tolerance will vary by about 100Ω for a 2kΩ resistor.
in most cases, it should work.
in most cases, it should work.
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Other answers are good.
If you're concerned about frequency of oscillation, remember that the value- and tolerance- of the capacitor in the circuit affects the frequency too.
If you're concerned about frequency of oscillation, remember that the value- and tolerance- of the capacitor in the circuit affects the frequency too.