Andrew Hodson
- Joined May 26, 2016
- 5
=½Can anybody let me understand the what is -3dB attenuation in electrical and electronics...!!!
=½Can anybody let me understand the what is -3dB attenuation in electrical and electronics...!!!
\(-3\;\approx\;-3.010\;...\;=\;10 \times log\left( \frac{1}{2} \right)\)
In broadcast television in the 70's, VU meters were calibrated to read 0 dB at an input level of +8 dBm. An attenuator pad lets you terminate line in 600 ohms while terminating the meter in 3600 ohms (?) for the correct ballistics without messing up the reference indication. Radio calibrates at +4 dBm. According to Wiki, most of TV land has moved to this calibration level.In the telephony, recording and broadcasting industry there is a standard reference level of 1mW into 600Ω. VU meters are calibrated so that the needle shows 0dB when 1mW into 600Ω is applied. This is equivalent to a voltage input of 0.775V into 600Ω.
Hi,Dear all
I have tried to design a low pass filter.
Please find the attached schematic and simulation results..
I have done here AC sweep analysis .
could anybody elaborate me-
1. V1 and V2 in plot.
2. Where is -3db or +3db point
3. How do calculate start point in plot.
4. What is the phase degree.
5. Is this right way for circuit analysis.
6. How one can analyse this circuit.
Thanks in Advance !!!
I think ,
Thanks Bertus for posting the picture itself.I
I think ,
It's now clearly visible. .
Can any explain my questions.
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