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작성자닥터유 조회 11회 작성일 2020-12-04 19:12:38 댓글 0

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Universal Power Meter ( AC/DC Voltage Or AC/DC Current) Frequency

Hello friends in this video I am going to show you how we can make a universal power meter that can be used in many Equipments. this power meter is capable to read AC as well as DC voltage. Along with AC /DC current.
it can also measure frequency, Power, Etc
we can easily select various parameters using 4 push button.

this project can be made using arduino Nano Or Atmega328 (in future I am going to make volta amp meter using cheap Atmega8 IC). or 16x2 LCD, ultra low offset opamp for current value amplification.

Project Details will be available soon()

#275 How to Test Feedback circuit in SMPS and how feedback circuit works

Watch this Video in Urdu Hindi

in this video i discussed whatvis feedback circuit in switch mode power supply smps. how to test feedback circuit in switching mode power supply.
the optocoupler is connected to positive source through a current limiting resistor and the cathode of optocoupler is connected to adjustable zener regulator which provides offset voltage to the optocoupler upon getting the reference level at its pin 1 through voltage divider resistor set.
so the Ripples in output high line are transferred to the pwm through optopcoupler by means of varying light in the optopcoupler due to the Ripples in Output. it causes the output transistor junction resistance to vary, this varying resistance is fed to feedback pin of pwm controller. which utilitizes it to adjust pulse width duty cycle

Power Supply Repair - Common Problem of a SMPS

How to repair a common problem of a Switched Mode Power Supply (SMPS). Easy and analytical process with "Tips and Tricks".
Note: In some segments i use 4x video speed. You can see those segments in real time by using the Embedded YouTube Tool: Settings - Speed - 0.25.

0:08 Overview of the Power Supply.
0:57 Problematic capacitors and how to choose the right ones.
3:43 De-soldering/Soldering process with tips (4x speed - for real time use the Embedded YouTube Tool: Settings - Speed - 0.25)
15:24 Checking the old capacitors with multi-meter.

Where to get the Components?
I am happy using this site (https://goo.gl/djbGH8) because is has low prices, sends to any country, no minimum order, good quality and free shipping.
Good Selection Capacitors with many options: https://goo.gl/lI1hk9
Nice Selection of 50V Capacitors: https://goo.gl/iECwSF

Where to get the Tools?
I am happy using this site (https://goo.gl/djbGH8) because is has low prices, sends to any country, no minimum order, good quality and free shipping.
These are the tools i have used and i have listed only those i recommend from personal experience.
Soldering Iron: https://goo.gl/Zhc0An
Solder Wire with Flux: https://goo.gl/7SbXzJ
De-soldering Braid: https://goo.gl/LErzYl
Soldering Paste Flux: https://goo.gl/jZW51z
Anti-static Tweezers: https://goo.gl/17S4UJ

... 

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