Comments on: Video: Understanding Impedance https://jestineyong.com/understanding-impedance/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Tue, 18 Aug 2015 16:36:34 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: Chris https://jestineyong.com/understanding-impedance/comment-page-1/#comment-250287 Tue, 18 Aug 2015 16:36:34 +0000 https://www.jestineyong.com/?p=9819#comment-250287 Robert Calk:
I checked too the math and I can say the calculation is closely as Lee Davey explain. He got a small mistake in the first formula bat he say, does the source voltage is 120V and there are a dissipation of 2V because of the LED. So I would make this formula just for better understanding:
R=(Usource - Uled)/Iled
Where:
Usource is the input voltage of the voltage source to the circuit
Uled is the voltage what the LED need
Iled is the current what the LED need

I think he rounded the results in ohm because the true results are not possible to get in real resistor values.
So he changed the result to the nearest real resistor values.
If he does it so than he should tell that!

In my calculation for the resistor I got 6555.55 Ohm and I got the Xc=5643.
So I think its pretty good.

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]]> By: Jestine Yong https://jestineyong.com/understanding-impedance/comment-page-1/#comment-240218 Sun, 21 Jun 2015 23:23:31 +0000 https://www.jestineyong.com/?p=9819#comment-240218 In reply to Rajeev.

Hi Rajeev,

Have you checked if the output voltages from the power supply good and stable?

Jestine

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]]> By: Rajeev https://jestineyong.com/understanding-impedance/comment-page-1/#comment-240040 Sat, 20 Jun 2015 13:05:34 +0000 https://www.jestineyong.com/?p=9819#comment-240040 Sir
My LG CRT TV has some problem like when switch ON the TV its power LED blink with tic tic sound and no picture seing.After a few second its LED will be off and also sound will be off.what is its cause and bow will be rectified it.

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]]> By: Robert Calk https://jestineyong.com/understanding-impedance/comment-page-1/#comment-239930 Fri, 19 Jun 2015 13:54:01 +0000 https://www.jestineyong.com/?p=9819#comment-239930 I am subscribed to Ben's channel. He has a lot of great and interesting videos. But he doesn't explain how he gets the results on his calculations. I grabbed a calculator and tried various ways of calculating for the resistors and never got the numbers that he claims it is for the resistance.

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