Minggu, 06 Desember 2020

dbx 166XL compressor is fault

 dbx 166XL compressor is faulty



Damage dbx cmpressor

1. when turned on all the led lights

2. All settings do not work



steps to fix :

1. Open the dbx box cover

2. check the input voltage to the circuit, here the voltage used is +15 volts, -15 volts

3. When the measurement is done, the voltage drops and the -15 volt regulator ic becomes hot.

4. the next step is breaking the current leading to the circuit after the powersuplay to find out

   damage to the power supply or not. after disconnecting the current, turn it on

   dbx and check the power supply output again. after measuring the voltage that comes out

   normal.

5. then check the main circuit in the voltage supply section that makes the circuit

   the voltage drop.

6. After checking there is a short capacitor in the -15 volt section of the circuit.

7. replace the short capacitor or it can be removed, but better to replace.

Capasitor short

8. Damage can be seen as shown in the picture.
Replace capasitor  marked

Rabu, 27 November 2019

POWER AMPLIFIER TOA ZA 2120 MATI TOTAL

POWER AMPLIFIER TOA ZA2120 MATI TOTAL

KERUSAKAN :
-indikator power mati
- tidak keluar suara pada output

 LANGKAH LANGKAH PERBAIKAN
1. Pertama cek bagian Fuse jika putus langsung ganti
2. cek fuse  bagian output,ini bisanya putus
3. cek Transistor FINAL biasanya ini yang menyebabkan Fusu putus
4. CekTransistor  final tersebut jika menemukan kondisi short lansung ganti
5. pastikan semua komponen yang rusak diganti
6. setelah semua dirasa sudah fik langsung saja di tes apakah sudah berfungsi normal atau tidak
7. jika sudah normal kembali  siap digunakan


Selasa, 29 Agustus 2017

TV Goldstar was struck by lightning

Coming Goldstar TV consumers die totally because there is lightning strikes in the tree near the house. after knowing the cause of the estimated part of the damaged power supply. tv i open and see no burned components and fuse break up.First check the power supplay.Tv turn on the output voltage no power supply. check the circuit and check the voltage after the diode turns out the voltage, traced into the input component is there but ouput STR no voltage, before replace STR check all components Power supply. all components baik.langkah next change STR. after change STR Tv I turn it on.tv still do not want to live just Led indicator flashed dead. Must have protec any components that die again pasti.cek voltage B + and others it drops, Protec circuit I loose, then try turn on the tv, byarr .... lights that I plug in B + flame. (Bolam to check output voltage, if the flame means already indicate there is a voltage out) check the normal B + voltage but the screen is not flashing just dark. check the line ABI to IC, check the components one by one finally find the 5.1 v leaked zener diode. then I replace the Diode. plug Protect line directly try hidupin TV ...., byaar ... finally can plasticity of picture. while checking all
voltages, after all normal voltage, plug the
TV cover and hire deh hehehehhe .....
.Based personal experience.

TV akari 14" raster disability

Akari TV 14 "with the symptoms do not go out the image / raster disability, OSD does not come out but the sound is normal. After du trace of damage to the Elko 22uF / 250 volts which is near the flyback. After replacing the capacitor directly normal picture.


 Looks like in the picture



Selasa, 23 Februari 2016

PCB Dril Speed Controller With IC 555

PCB Dril Speed Controller With  555
(By : T.K. Hareendran )


Described here is a simple, inexpensive and useful circuit for electronics hobbyists. The circuit is nothing but a PCB drill speed controller, which can be used to control the speed of any 12VDC small pcb drilling units. Such portable units are now widely available, and even a hobbyist can make it without too much difficulty.





In this circuit, the renowned timer chip LM555 (IC1) is used as a PWM circuit. The whole circuit can be powered from a standard 12VDC supply, capable of sourcing ample current to the PCB drill motor. As you may noted, power supply for the PWM circuit is down-converted and regulated with the help of a 3-pin fixed regulator chip LM7805 (IC2). This will improve the circuit stability. Precision 50K trimpot P1 is the variable drill speed controller. Finally, a logic-level power Mosfet IRL 530N (T1) is used as the output drive element. This IRL530N mosfet (available in TO-220 package) can handle current upto 27A! Fast switching and Low on-resistance – RDS (on) – are other attracting features. IRL 530N is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts.
Drill Speed Controller Notes
  • PWM (Pulse Width Modulation) is an efficient way to vary the speed and power of electric DC motors. The described circuit can be used to vary the speed of small electric PCB drill.The circuits can quite easily be built on a standard prototyping board. The power component (IRL510N) must be connected to the power rails and the drill motor with quite thick wires and cables.
    As used here, a Power MOSFET motor driver is better than the traditional driver because it is working at a higher switch frequency, and this also avoids the unnecessary voltage drop and power loss
  • Electrically a DC motor can be viewed as a series RL network with a voltage generator. The generator represents the back electromotive force (BEMF) generated by the motor’s rotation and which opposes the electromotive force of the supply. Diode D3 (1N4007) is added to protect the electronics from BEMF. Diode “MBR 1645” is a better alternative
  • STP22NE10L (100V/<0 .085r="" be="" can="" in="" irl510n="" li="" lieu="" used="">
  • 12VDC /2A powered prototype tested with a 12V (1A) Small PCB Drill Press


Source : http://www.electroschematics.com/8640/pcb-drill-speed-controller/

Kamis, 26 November 2015

Arduino with keypad tutorial

A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad wired as an X-Y switch matrix, normally-open switches connect a row to a column when pressed. If a keypad has 12 keys, it is wired as 3 columns by 4 rows. A 16 key pad would have 4 columns by 4 rows. Some time ago, I bought a couple of 3×4 membrane keypads from eBay. As usual it’s packed with zero documentation, thus it took couple of hours to get to work. Anyway the keypad is a perfect blend of art and technology with a price tag far below rubies!
Add caption
 This little article is designed to help you get started with your new microcontroller + keypad project so let’s start. Following figure shows the internal structure and pin notation of the 3×4 keypad used for the experiment. The drawing is the result of an obscene amount of research work because I really wanted to make an error-free guide for the project we are working on.


keypad: internal structure and pin notation


 Here is the same information in a textual way; keypad columns C1-C2-C3 are routed to pins 3,1,5 and rows R1-R2-R3-R4 are routed to pins 2,7,6,4 located at the end of the 7-pin flexible cable. Much more clear now?


keypad:colums And row switching




So now you can see how the button presses can be translated into electrical data for use with a microcontroller. We can now start the real experiment with as Arduino Uno by wiring up the keypad to the Arduino in the following/like manner:
  • Keypad pin 1 to Arduino digital 3 //C2
  • Keypad pin 2 to Arduino digital 5 //R1
  • Keypad pin 3 to Arduino digital 2 //C1
  • Keypad pin 4 to Arduino digital 8 //R4
  • Keypad pin 5 to Arduino digital 4 //C3
  • Keypad pin 6 to Arduino digital 7 //R3
  • Keypad pin 7 to Arduino digital 6 //R2
Since keypads are available from many retailers make sure you can get the data sheet as this will make the task easier when wiring them up. If your keypad is different, take note of the lines in the sketch from //keypad type definition, as you need to change the numbers in the arrays rowPins[ROWS] and colPins[COLS]. You should enter the digital pin numbers connected to the rows and columns of the keypad respectively. Example from Arduino playground:
  1. #include "Keypad.h"
  2. // keypad type definition
  3. const byte ROWS = 4; //four rows
  4. const byte COLS = 3; //three columns
  5. char keys[ROWS][COLS] = {
  6. {'1','2','3'},
  7. {'4','5','6'},
  8. {'7','8','9'},
  9. {'*','0','#'}
  10. };
  11. byte rowPins[ROWS] = {5, 6, 7, 8}; //connect to the row R1-R4 pinouts of the keypad
  12. byte colPins[COLS] = {2, 3, 4}; //connect to the column C1-C3 pinouts of the keypad



Next is a project example, where the Arduino is instructed to do something based on a correct key (secret number) being entered into the keypad, probably the most demanded application of the keypad. For this, just wire up the hardware (arduino+keypad) as described earlier.

arduino keypad




Although the code is an entry-level one, it includes a secret key option that will need to be entered on the keypad. The Serial Monitor will tell whether the numerical-key inputted to the keypad is correct or not. To activate and deactivate the lock, the user must press * and then the secret key, followed by #. Okay, copy-paste, compile and upload this sketch (adaptation of a work by John Boxall) as usual:
  1. #include "Keypad.h"
  2. const byte ROWS = 4; // four rows
  3. const byte COLS = 3; // three columns
  4. char keys[ROWS][COLS] =
  5. {
  6. {'1','2','3' },
  7. {'4','5','6' },
  8. {'7','8','9' },
  9. {'*','0','#' }
  10. };
  11. byte rowPins[ROWS] = {5, 6, 7, 8};
  12. byte colPins[COLS] = {2, 3, 4};
  13. Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
  14. char KEY[4] = {'1','2','3','4'}; // default secret key
  15. char attempt[4] = {0,0,0,0};
  16. int z=0;
  17. void setup()
  18. {
  19. Serial.begin(9600);
  20. }
  21. void correctKEY() // do this if the correct KEY is entered
  22. {
  23. Serial.println(" KEY ACCEPTED...");
  24. }
  25. void incorrectKEY() // do this if an incorrect KEY is entered
  26. {
  27. Serial.println("KEY REJECTED!");
  28. }
  29. void checkKEY()
  30. {
  31. int correct=0;
  32. int i;
  33. for ( i = 0; i &lt; 4 ; i++ )
  34. {
  35. if (attempt[i]==KEY[i])
  36. {
  37. correct++;
  38. }
  39. }
  40. if (correct==4)
  41. {
  42. correctKEY();
  43. }
  44. else
  45. {
  46. incorrectKEY();
  47. }
  48. for (int zz=0; zz&lt;4; zz++) // clear previous key input
  49. {
  50. attempt[zz]=0;
  51. }
  52. }
  53. void readKeypad()
  54. {
  55. char key = keypad.getKey();
  56. if (key != NO_KEY)
  57. {
  58. switch(key)
  59. {
  60. case '*':
  61. z=0;
  62. break;
  63. case '#':
  64. delay(100); // added debounce
  65. checkKEY();
  66. break;
  67. default:
  68. attempt[z]=key;
  69. z++;
  70. }
  71. }
  72. }
  73. void loop()
  74. {
  75. readKeypad();
  76. }
If your compiler raises an error “keypad does not name a type”, probably you have not installed the required Keypad Library correctly. If you still have the problem after downloading and installing the library, just drop me a line here in the comments.
Note that the good old 3×4 telephone keypad from your junk box can also be used for this project. Like most keypads, it is wired as an X-Y switch matrix, the normally-open switches connect a row (R) to a column (C) when pressed. Next figure shows the pin assignments of a generic 3×4 telephone keypad:



 f you don’t know which pin represents which row or column, you have to fiddle the “rummy” keypad using your analog multimeter. It might take hours to get to work, be patient!


Note: At the middle of this experiment, I got another 3×4 keypad from an eBay seller with the “true” Arduino compatible pin-out (see figure shown below). If you are using this type, it would be better to change the arrays rowPins[ROWS] and colPins[COLS] in the sketch as indicated.
AKP-7



reposted by T.K.Hareendran in Arduino
source : http://www.electroschematics.com/12446/arduino-with-keypad/

Sabtu, 05 Februari 2011

Digital Radar Speedometer



This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser reflexion. It sends laser radiation to the object and this object reflects the laser radiation to the radar. To evaluate the speed of a vehicle, we must be in front of it. In other words, the vehicle must come in our direction. The front of the radar must point the front of the vehicle. The radar has the shape of a pistol. In this radar, it has a laser LED and a laser diode. Both have a lens.
The laser LED can send a spot of light to a distance of 90 m (295 ft). It's very important that the distance range of the laser LED is 90 m, if not, the speed will not be calculated properly. The laser diode, which receives the light signal by the laser LED, must be able to detect the light which is same color as that emitted by the laser LED. The laser diode and the laser LED must be placed one beside the other. They are protected by a tinted pane. They must be placed at the front of the radar and point the outside. The radar is powered by a 9V battery and it has a SPST switch to control its power state.
The display, or the speed indicator, is placed at the rear of the radar, just on the right of the overload LED indicator. All the logic components of the circuit must be of the 74AS series and TTL type. Because they have short time of response (less than 1.7 ns) and have high frequency supports (more than 200 MHz). The radar can evaluate the speed of an object moving between 0 to 999 km/h. After this speed, the overload LED indicator will turn on and the "999" will still displayed. The radar displays the speed during 3 seconds, after this time, it displays "zero" (0). 
source : http://iq-technologies.net
 
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