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  1. G

    SMPS IC Gets Hot

    we are using infra red pointers. Agreed that the infrared pointers are very poor. but then too i can expect the tolerance of 4 to 5 degree. Than too the temperature is quite high around 85 degree when the ambient is around 24 degree.
  2. G

    SMPS IC Gets Hot

    Temperature GUN. I point the gun on IC and transformer to measure the temperature. Even I have noticed that i cannot touch the IC and transformer for more than 5 to 6 seconds.
  3. G

    SMPS IC Gets Hot

    Mains input 220v AC For RCD have used FR107 Fast recovery diode and for output its schotty diode. The ic does not have any current sense pin, Yes Secondary winding is being sandwich between two primary
  4. G

    SMPS IC Gets Hot

    the gap between the transformer bobbin after winding and core is around 0.5mm Have uploaded the transfomer winding details in Post No #6.
  5. G

    SMPS IC Gets Hot

    Sorry I don't have a diff probe to measure it. But I have a doubt regarding Transformer saturation. Test 1 Zener Volt 11V Output voltage: 12.30V Load. 1 Amps Temperature: Around 90 degree Test 2 Zener Volt 11V Output voltage: 12.3V Load. 0.650 Amps Temperature: again Around 85 degree. Test 3...
  6. G

    SMPS IC Gets Hot

    Yes, i am sure for the winding as you mentioned. secondary winding has been sandwich between two primary 1639827225 but why is it that the temperature remains maintained if output voltage is less than 11V by changing the zener voltage to 10.3V
  7. G

    SMPS IC Gets Hot

    Have attached the transformer winding details. did you sandwich wind the transformer? did not get your point.
  8. G

    SMPS IC Gets Hot

    Yes, I have made the changes and have used SR3100 Diode instead of DL4001 and zener is 11.1V yes, i have followed the rules, as per the datasheet. i agreed that the track was quite close to IC pin 7 and 8 as marked in the image, but have removed the track and add temperory jumper. (Image...
  9. G

    SMPS IC Gets Hot

    Hi All, i am trying to make an 12V 1 Amps SMPS using DK1203 IC. Circuit Diagram, Top Copper and Bottom Copper with component placement file has been attached. My problem is the SMPS works well for initial 10 to 15 minutes with the load of 850mA , but later it starts flickering. i have noticed...
  10. G

    Timer Circuit Using Transistor

    Yes, The PCB is exact same as the schematic posted. The voltage at the Q1 Base rises when mains are ON, but drops rapidly as soon as mains switched OFF
  11. G

    Timer Circuit Using Transistor

    Yes Sir, You were right. Actually C2 was the issue. with the same circuit i changed the value of C2 from 470uF to 10uF. and R6 to 47K. Which made the system work perfect. Now the voltage at Q1 Base drops down rapidly within a millisecond when RV1 is at minimum and hardly 2 seconds when RV1 is...
  12. G

    Timer Circuit Using Transistor

    i am still facing a problem with adding a zener diode between Q1 base and C1. have added 4K7 resistor to Base and Emitter (GND). so here when the mains are put to ON, voltage level on Q1 base reaches to 0.72V MAX. but as soon as the main as put to OFF, the voltage from 0.72V to 0.60V goes down...
  13. G

    Timer Circuit Using Transistor

    I tried using a schottky, but its was not a reliable solution. Yes, i Think i should try this, adding a 3.3V or 4.7V Zener Diode. where again 1N4007 will help me out for faster discharge, atleast till 0.7V 1637164883 My problem is C1, because its the only capacitor which stays charge. C2 wont...
  14. G

    Timer Circuit Using Transistor

    Hi All. I have built a timer circuit using Transistor. (Circuit Diagram Attached) The power source is 24V 3 Amps Transformer. and i am operating a 24V 10 RPM AC Motor for one of my application. On Power ON, The motor will be ON for a specific period of time and the time is decided by C1...
  15. G

    Control DC Motor Circuit using PWM

    Motor is PMDC Regular laminated
  16. G

    Control DC Motor Circuit using PWM

    no i dont have a scope. i tested the voltage with 10M 2 watts resistor on load and keeping the mosfet continues ON. which gave me around 350 to 380V
  17. G

    Control DC Motor Circuit using PWM

    i have used 1N5408 as the datasheet says TYPICAL APPLICATIONS For use in general purpose rectification of power supplies, inverters, converters and freewheeling diodes application. can i use FR107 Diode if cannot, can you suggest some part no. 1634023755 The peak voltage what i am getting...
  18. G

    Control DC Motor Circuit using PWM

    have not done power calculations for snubber. i got the snubber values from one of the article in google. yes, i had measured the mosfet voltage which was around 190 volt and current to drive the motor is around 4.2 Amps.
  19. G

    Control DC Motor Circuit using PWM

    The frequency what I am using to drive the motor is 1 khz. And yes the mosfets are on heat sink, but I have noticed that without snubber the mosfet does not gets hot, an average temperature of 60 to 65 degree Celsius. But when snubber is connected, both the snubber and mosfer gets extremely...
  20. G

    Button click performs all function without pressing second press, third press?

    Try This it should work void switich_1(void) { count = 0; if (modef == 1){ // button is pressed if (count == 0) { count++...

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