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Recent content by andyyau

  1. A

    Generating 320VDC from low voltage

    Hello, I am going to make a dc-dc converter which uses 9.6V battery to generate regulated 320VDC. Can anyone suggest suitable PWM IC and circuit? Many thanks in advance! Andy
  2. A

    PWM IC for generating 320VDC from low voltage

    Hello, I am going to make a dc-dc converter which uses 9.6V battery to generate regulated 320VDC. Can anyone suggest suitable PWM IC and circuit? Many thanks in advance! Andy
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    What does ppm stand for ?

    What is "ppm" When talking about temperature coefficient of electronic components, they are always specified in ppm. What is it? Please give a explanation. Thanks!
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    What is the best C compiler for AVR?

    Re: Best C compiler for AVR My experience, a program for AVR Tiny26 Imagecraft: code size 83% IAR: 61% See the difference?
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    Chip capacitor incomming QC testing

    Hello, I have some problems for chip capacitors. Currently we are using some "quality" chip capacitors, such as Kemet and Phycomp (Ex philips). But I find them easily short circuit after wave soldering. Especially if the pcb is placed at high humidity environment. The problem seems to be...
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    Question about AVR internal pullup for input

    avr internal pullup House_Cat, Thanks! I also find a problem for a normally open push button switch. If it is open and the micro is placed at high noise environment, I find that noise will make program reads "0" for the input pin even the switch is not pushed. Adding a small capacitor to the...
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    Question about AVR internal pullup for input

    Hello, When I use ATMEL AVR MCU, it has internal pullup for input. If I connect a push button switch to this pullup input pin, shall I add a resister to this pin? If so what is the value of the resistor or what is it current? Thanks!
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    TSSOP and wave soldering

    Hello, mr_ghz I had read this file already. But the problem is that at page 2 of it, it states that "Not suitalbe for wave soldering" for TSSOP8!! This is the problem. Any other help? Andy
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    TSSOP and wave soldering

    Hello, I am going to use a TSSOP-8 IC. The PCB must be used with wave soldering process. The problem is that the pitch of the TSSOP ic is so small and should be 0.65mm. After waver soldering, I think more pins will be shorted together with solder. Is there any method or any special footprint...
  10. A

    DC (0-10V) input signal and isolation

    Many thanks for all your reply. However, can anyone tell me the theory to use the transformer using PWM. I am using an analog input signal of 0 to 10V DC. In what way the PWM signal can convert this analog voltage by the transformer? Thanks!
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    DC (0-10V) input signal and isolation

    I need circuit for isolating a DC input signal (0-10V) which will be used to control the speed of motor. I know this can be done by a transformer, but I do not have the circuit? Can anyone help?
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