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    Power MOSFETs

    Hi all, Check this out....... may be useful for this topics http://www.edacafe.com/books/ASIC/Book/CH03/CH03.2.php (or the whole free ebook at http://www.edacafe.com/books/ASIC/ASICs.php)
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    Beginers OPAMP question

    can we say virtual ground = opamp dc offset voltage?
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    Your partner & supplier of all kinds of electronic components

    How are about the shipment to people in hong kong like me?
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    AM RECIEVER

    AM demodulation is envelope detecter only. And the loudness is depends on the modulation depth of the source. And IF is the resultant frequency of the difference between the local oscillator and the carrier frequncy, which is to lower the frequency for demodulation.
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    Re-called Light Bulbs

    there are thousands of factories in china..... some of them are qualified manufacturers of those large brand names, where they will have a better qualifty control + ISO certificate. some don't have anythings.... mostly these only supply to china local stores..... somhow these un-qualified...
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    Re-called Light Bulbs

    I will not buy cheapo light bulb without a good brand name...... So I prefer to pay double more to get somethings under the name of philips
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    LED question???

    first, you got to know it is a common anode or common cathod 7 segment LED display. second, the fastest way to check the a, b, c...g is to directly check which pin will lit its corresponding segment by applying power across the pin and the common terminal. Remember, test is always the fastest...
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    interface circuit with computer

    Here is some examples in interfacing RS232 and parallel port on PC: http://www.beyondlogic.org/
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    AC current measurement

    use a coil and opamp circuit, you can convert AC current to DC voltages.
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    3V LED Chaser project

    audioguru, Your project is great, save me from thinking on how to flash a bunch of LEDs with 2 AA cells... I will build my own too, not for $$$, but for a special gift to my girlfriend..... ;D The IC with prefix CD40xx may not work at 3V but the 74HC40xx should be work fine with 3V..... I...
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    I need a push button switch

    try to find switches info from the following website http://www.wealthmetal.com/products.html 8)
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    Cheap and easy acquired Capacitors and Resistors from China

    No offend here but I want to tell some facts. Shenzhen, a city in South China near Hong Kong, got very cheap components since many factories around. And there is a shopping mall that have many many shops to sell components in very low price. Imagine just needed USD$2.5, you can get 1K pieces...
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    remote control using radio freq

    Good! IR is also a good solution. For RF, it will take more time for you to troubleshoot and needed more equipment..... But should be take great care if your circuit is used under bright light . Since the ambient light contain full spectrum of frequencies which may jam your IR signal or...
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    part replacement

    not just east copy west.... but also some US fabless will copy and improve the chips. One example is california microdevice (hmm... hope I haven't mistaken) .... they have single opamp with low noise and wide bandwidth which is pin to pin compatible with NS one..... but I forget the part...
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    RS232 to I2C/SPI

    Suraj, Woo...... I am a bit of awaken with your knock on my head :P ;D I am now studying those information now.... And I want to work this out as I think it will be a nice tools for development...... Trigger
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    part replacement

    audioguru, May be you are National semiconductor supporter, but I am not. Mostly used in products will no longer be NS brand, but some others. Check the link here: http://databook.kec.co.kr/Products/item_list.php3?type=X&key1=E&key2=100 Check what the specification on KIA358 and...
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    part replacement

    I can tell, LM324 used as audio amp is much worst than using LM358. As circuit designer, we always like to use the perfect components.. however, the reality will not let you to, esp. your boss is barking loud to stop you. And I can tell, some of those opamp, are now produced by Korean or...
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    transverter

    pre-scaler?
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    part replacement

    some of the opamp are crap but that doesn't mean it is not suitable for products. I can tell, LM358 is still widely used in many everyday products..... why, because it is low cost....... (the price of IC is not what you seen in the local store) Actully, no manufacturers will care about the...
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    ECG for home use

    I think the quoted price of those chips are in HK dollor, right? If yes, very good price..... Oli, can you tell me where you get them? Local stores? Thanks.
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