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Recent content by AinaLaw

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    How long will LM317T drive 3V 350mA Power LED?

    Dear all, I want to drive 3v 350mA Power Led with LM317T. The Battery rated 6V 4A. I use a 286 ohm resistor for the led. ( LM317T is set to 3,1V). My question is: How many hour can this 6V 4A battery drive the Led ? Thank you Aina L
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    Led in Series problem

    Dear All I have a problem with my Led project. The schematic is : 12V - 78M09 - R 1ohm - Led1 - Led2 - Led3 - Gnd The Led rating is : 3V - 3,5V 25mA All Led is On. But when I measure the voltage for between Led pins, I get this strange result : Led 1 = +/- 5.4 V Led 2 = +/- 1,8 V Led 3 =...
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    What is the difference between cmos B (Buffer) and UB (unbuffer) device ?

    Dear all, What is the difference between cmos B (Buffer) and UB (unbuffer) device ? Is there any website for CMOS Basic/Specification tutorial ? Thank you Aina
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    Question about CD4051

    Thank you for your help. But can you please give me the formula to calculate the resistor value for pull up and pull down (if the cmos has +5V). Thank you. Aina Law
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    Driving a LED with CMOS gate: sink and source

    Sink/Sorce a Led Hi I'm a newbie in electronic. I want to ask about specification needed to drive a led with cmos gate. If I want to "sink" a led then I must look at CMOS "IOL" and Led "IF". (Corect ?) If I want to "source" a led then I must look at CMOS "IOH" and LED ____ ? Please give a...
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    Question about CD4051

    Hi I want to know what happen to "not selected" output pin of CD4051 ? Does it go 3 states ? If I connect this "not selected" output pin to CMOS INV gate, what do I get ? 0 or 1. Thank you Aina Law
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    Question about controlling and driving a relay

    Re: Question about Relay If I connect it directly to 12V AC, can it work ? I don't want to connect it to DC. Thank you. Aina
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    Question about controlling and driving a relay

    Question about Relay Hi all, I have a relay with rating 12V DC 240V AC 2A. I want to control this relay with AC. I want to know what AC voltage that can drive this relay ? ( I think 12V AC will not correctly.) Thank you Aina Law
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    Why does the voltage drop in my small power supply?

    Re: Voltage Drop Hi All. My circuit draw only 30 to 40mA . It's one line of resistor with 3 leds only. When I connec it to two lines (in paralel), voltage drops more, this time is the voltage is less than 9V. Thank you Aina
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    Why does the voltage drop in my small power supply?

    Voltage Drop Dear All, I have a small power supply rated 12V 1000mA. The difrence between + and gnd is 11.68V (with no load). But when I connect it to my circuit ( resistor with 3 leds in a series), the voltage between + and gnd is 9.8 V only. Why is the voltage drops ? Thank you Aina Law
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    Looking for a H Bridge Circuit that uses only 1 input control line

    Re: H Bridge Circuit Thank you for your help. If I use this circuit to control 12V 1A motor only, Can I change the mosfet to other power transistor ? Mosfet is expensive here. Regards, Aina Law
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    Looking for a H Bridge Circuit that uses only 1 input control line

    Re: H Bridge Circuit Please tell how I can add the npn transistor. Regards Aina
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    Looking for a H Bridge Circuit that uses only 1 input control line

    Hi I'm looking for a H Bridge Circuit that use 1 input control line only. When the input = 0 then the motor move forward, when input = 1 (=VCC) then it move reverse. Thank you. Aina Law
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