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gauravkothari23's latest activity

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    gauravkothari23 replied to the thread 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...
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    gauravkothari23 replied to the thread 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...
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    gauravkothari23 replied to the thread 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...
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    gauravkothari23 replied to the thread 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.
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    gauravkothari23 replied to the thread 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...
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    gauravkothari23 replied to the thread 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...
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    gauravkothari23 replied to the thread SMPS IC Gets Hot.
    Have attached the transformer winding details. did you sandwich wind the transformer? did not get your point.
    • DK Trans.png
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    gauravkothari23 replied to the thread 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...
    • DK1203 SMPS.png
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    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...
    • Design.jpg
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    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...
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    gauravkothari23 reacted to KlausST's post in the thread Timer Circuit Using Transistor with Like Like.
    Hi, I have to admit, I indeed missed R3. I completely ignored it, just wondered about the power dissipation in R4. Thanks for...
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    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...
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    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...
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    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...
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    Hi All. I have built a timer circuit using Transistor. (Circuit Diagram Attached) The power source is 24V 3 Amps Transformer. and i am...
    • Timer Using Trans.png

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