Hello guys,
I was putting together a bjt astable multivibrator with the following values for R2=R3=15,000Ω and C1=C2=1μF. I used the popular f=1/1.4RC to arrive at a frequency of 50Hz, unfortunately, there was no way I could tell that the cicuit was indeed working (I don't have an oscilloscope), so i thought I'd verify the formula visibly with a much lower freq; I substituted the capacitors with 470μF ones, kept the resistors and run the circuit. I'm confused because the calculations gave a periodic time of 9.87seconds, yet the the circuit was running at ≈ 6.8 seconds!! (periodic time) That's a really huge margin, I'm not sure what I'm doing wrong because I have verified my calculations and redid the circuit with the same results.
Is this supposed to happen??
Also, all the circuits from the internet meant to oscillate at 50Hz, by calculation, oscillate at 32Hz??
WHY???
I'm confused?
Appreciate your time everyone.
Have a good one.
I was putting together a bjt astable multivibrator with the following values for R2=R3=15,000Ω and C1=C2=1μF. I used the popular f=1/1.4RC to arrive at a frequency of 50Hz, unfortunately, there was no way I could tell that the cicuit was indeed working (I don't have an oscilloscope), so i thought I'd verify the formula visibly with a much lower freq; I substituted the capacitors with 470μF ones, kept the resistors and run the circuit. I'm confused because the calculations gave a periodic time of 9.87seconds, yet the the circuit was running at ≈ 6.8 seconds!! (periodic time) That's a really huge margin, I'm not sure what I'm doing wrong because I have verified my calculations and redid the circuit with the same results.
Is this supposed to happen??
Also, all the circuits from the internet meant to oscillate at 50Hz, by calculation, oscillate at 32Hz??
WHY???
I'm confused?
Appreciate your time everyone.
Have a good one.