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WinAVR-1221 new bug report!
Since i have installed WinAVR-1221, my program suddenly failed! My ADC of Atmega64 can not work continuously! I want to start an ADC as fast as possible, so i discard the single...
Mon. Jan 14, 2008 - 05:15 AM
How to measure GND noise?
I use oscilloscope to measure GND noise level,of course, i am silly, i use the short probe and the long probe connected with GND which i try to measure the noise level, and it...
Wed. Jan 9, 2008 - 05:22 AM
my RS232's low level changes to -2.5V after opening COM!!
My RS232 communication can not work, so i test its level. After MAX232, it outputs level nearly +10V or -10V, this is right. But after i open the computer serial COM(RS232)...
Sun. Dec 30, 2007 - 03:42 PM
which type of filter is fast and nice to make analog output
I have a PLL circuit, which owns a PLL IC CD4046. CD4046 outputs PWM, and after a lowpass filter ,it outputs an analog output(DC). This is known by us. But i want to read the DC...
Tue. Dec 4, 2007 - 03:18 PM
how much parasitic inductance of a 15M ohm resistance?
As we know,a normal 15M ohm resistance has parasitic inductance, but how much is it?? I mean a normal resistance, not a surface mounting one.
Mon. Dec 3, 2007 - 08:54 AM
what is the difference between true RMS and RMS?
i can't tell the difference of true RMS and RMS. Is there a false RMS ??
Sun. Dec 2, 2007 - 08:48 AM
how to save my locked AVR??
i have several AVR(Atmega16 and Atmega64) locked. and i don't know why will lock them, maybe fuse or others. every time AVR Studio 4 just shows me "The OCD JTAG adapter was...
Fri. Nov 30, 2007 - 07:54 AM
about zero crossing detector
i want to make a simple but accurate zero crossing detector whose input is an ac sine wave and its output is digital signal(0 and 5V). what i am doing is using LM339 to make it,...
Thu. Nov 29, 2007 - 08:35 AM
have you heard about negative resistance??
in the research , i find the transducer's equation insists a negative resistance. it sounds strange to me, did you heard of that before?
Thu. Oct 25, 2007 - 06:22 AM
about LCD12864's spi communication
LCD12864's datasheet says the fosc is between 470Khz to 5920Khz when using serial communication. i just want to ask ,is it SCLK of AVR has to be set about 500khz? datasheet does't...
Thu. Oct 18, 2007 - 08:00 AM
dynamic impedance matching?
my research is ultrasonic generator, its function is to drive transducer. transducer's equation please see my attachment.
Mon. Oct 1, 2007 - 04:40 AM
my DDS using square wave crystal outputs badly!!
i have looked up the datasheet, it shows me that it can be applied both of square wave crystal or sine wave crystal. but , what i and my friend got is using square wave crystal...
Thu. Sep 27, 2007 - 04:35 AM

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