REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday, 24 February 2020

RGB LED STRIP CONTROL UNIT


Nowadays, lighting with LED strips is very popular. The use of RGB LED strips is especially interesting, because it allows you to get the most diverse color of lighting.
This device is designed to control an RGB LED strip or three LED blocks with common anodes. The device provides 13 modes of operation of the LED strip:

 Off state.
 All LEDs are on.
 The red LEDs are on.
 The green LEDs are on.
 The blue LEDs are on.
 Red and green are included.
 Red and blue are included.
 Green and blue are included.
 Smooth color switching.
 Switching colors.
 Ripple red.
 Ripple green.
 Throbbing blue.
The choice of mode is carried out with a single button. After turning on the power or pressing it, a sequential enumeration of the modes begins. To stop at the desired mode, you must press the button continuously during its playback. After that, the selected mode will work.
The circuit is based on the low-cost microcontroller PIC12F629. To smoothly change the brightness of the LEDs, the pulse width modulation method is used. This microcontroller does not have a PWM block, so PWM is implemented in software here.
Fig. 1
This microcontroller has a small amount of memory, so I had to save it. As a result, it was decided to abandon the manual adjustment of the brightness of the glow, and use a low-frequency PWM with a frequency of 400 Hz.
After power-up, the microcontroller initializes its internal registers and peripheral devices and loads the last operating mode. Pins 5, 6, and 7 send signals to field effect transistors Q1, Q2, and Q3, which control the colors of the LED strip.
A 12-volt power supply is usually used to power an LED strip. Therefore, to provide power to the microcontroller, a 5 D voltage regulator is installed in the circuit on the A1 chip.
Installation is made on a small printed circuit board with one-sided arrangement of printed tracks.
Fig. 2
Transistors IRLU024N can be replaced with some analogs, for example, such - STD12NF06L, STD20NF06L, 2SK2229, 2SK2782, 2SK2926.
Button S1 - round miniature with leads for wires. On the board for its installation, the holes are made oval (two holes are nearby and dig out material between them).

Author: Gorchuk N.V.
Posted By: FRANK at 07:50
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