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Type: Posts; User: imranahmed

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  1. Closed: Direct Torque Control of Induction Motor

    Please I want to learn and implement DTC for Induction motor, I read many articles but have some confusions.

    Basics:
    What is reference frame?
    What is d,q,reference frame?
    How to realize...
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    191

    Closed: SMPS Flyback Transformer Construction

    Please let me know how to practically construct attached flyback SMPS transformer.

    I have core ,bobbin,wires and insulations.
  3. Closed: PI Expert Software and its generated circuit designs

    Please let me know about warnings shown in PI Expert software while generating circuit of SMPS.
  4. Closed: Re: SMPS Power Supply of about 12VDC and 1A output

    OK
    I want to know its basics and theory behind him.
  5. Closed: SMPS Power Supply of about 12VDC and 1A output

    Dear Sir,

    Please let me know that about SMPS Power Supply 12VDC@1A.

    I want to make it for digital voltmeter I will make.
    I want to make transformerless power supply.

    I googled and found...
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    Closed: Re: 24VDC Single LED Flasher Circuit

    Actually I need indication of Pressure Sensor in CO2 Fire Fighting Control Panel.
    When signal comes from pressure sensor the 24VDC LED should blink with 50% duty cycle.
    Or
    Please let me know that...
  7. Replies
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    Closed: Re: 24VDC Single LED Flasher Circuit

    I made attached circuit from electroschematic but I want to make it for 24vdc a d I want 50% duty cycle blinking.

    155479
  8. Closed: Re: Lamp Test Circuit with some other indications.

    Yes you alright sir I got it.
    Please recommend me more diode other than 1N4001 or 1N4148 with negligible reverse current.
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    585

    Closed: 24VDC Single LED Flasher Circuit

    Please recommend me 24VDC Single LED Flasher circuit.
  10. Replies
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    617

    Closed: Re: Shunt in DC ammeter circuit

    Sorry yes 30A@60mV
  11. Closed: Re: Lamp Test Circuit with some other indications.

    I checked all wiring, it is OK but I used diodes 1N5819.
    You are saying is right diodes are leaky.
    Please recommend me good diode for my lamp test circuit or recommend me good lamp test circuit
  12. Replies
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    617

    Closed: Shunt in DC ammeter circuit

    I have DC ammeter and shunt for sending current.
    Shunt is 30A@60mA and ammeter also have same rating @24VDC supply.

    But I connected 24VDC line from 2 series batteries with shunt 1st main...
  13. Closed: Re: Lamp Test Circuit with some other indications.

    I have China make LED attached herewith.

    They are 24V and no polarity mention.I tested with DC supply of 24V and they glow on both polarities.

    155418
  14. Closed: Re: Lamp Test Circuit with some other indications.

    Brother all LED's have internal current limiting resistors in natural circuit.
    And all LED's have 24VDC.
  15. Closed: Re: Lamp Test Circuit with some other indications.

    SW1 is common signal for D1,D5 and D9 and below 5 LEDs will get separate signals from pressure sensors.
    D1,D5 and D9 negative connected with SPST switches SW3,4,5.

    But I faced some leakage...
  16. Closed: Lamp Test Circuit with some other indications.

    Hi everyone,

    Please let me know that I builds a circuit of Lamp Test and indications of 5 pressure sensors and 3 indication connected to 3 SPST switches. SW2 is lamp test button,

    Problem is,...
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    496

    Closed: Re: Old resistor value recognition

    Dear FvM,

    I confused to 6 band resistor where is his first band starts?
  18. Replies
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    496

    Closed: Old resistor value recognition

    Please let me know about values of resistors attached herewith.
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    547

    Closed: Richtek RT7736 flyback controller IC

    Please let me know that RT7736 is obsolete or not?
  20. Closed: Re: Reason behind short circuit in SMPS primary side

    How to test primary is shorted or not?

    I test with Ohm meter its resistance shows zero ohms.
  21. Closed: Reason behind short circuit in SMPS primary side

    Please let me know that why components in primary side in SMPS battery charger damaged i.e bridge rectifier diodes, switching transistor 10N60, current sense resistor 0.5 ohms, optocoupler and UC3842...
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    2,252

    Closed: Re: SMPS battery charger control IC UC3842

    I do not have oscilloscope but UNI-T 55 multimeter it has only option for 20khz.

    When repair the charger it was working for 2 to 5mins then blast occurs mosfet,uc3842 and 0.5 ohms resistor burst...
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    1,257

    Closed: Re: LM317 as a High Current Voltage Regulator.

    Yes it is rectified and 100uF 50v capacitor used.
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    Closed: MJ2955 PNP Transistor heatsink

    Please let me know that I connect MJ2955 PNP Transistor 10A Ic. But it becomes very hot at 1.2A

    I am using 12VDC 21W bulb means 1.75A and 2955 gets very hot.

    149131
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    Closed: Re: LM317 as a High Current Voltage Regulator.

    I read datasheet of MJ2955 TO-92 it is BCE configuration

    - - - Updated - - -

    Please attached herewith pictures of my board transformer 220vac to 19v output 5A149122

    But when I connect bulb...
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