Recent content by icbcodc

It's a good news,thank you.

Thank you, Privatier. I'm also thinking about optimizing the circuit by adding an amplifier into it,but I don't have many clues about the protection component for the input.

Hello John, The difference last time might be caused by unexpected short connection within the TRS terminal of the impedance measurment circuit, and I've fixed it. Today I tried to measure the capacitor mentioned before,and got the result like this with warning about low signal to...

Thanks Sam, I'v delete JRE, and reinstalled the REW. No problem.

REW is updated to this new version.

Hell John How's it going? Today I encountered an error message when I closed all the measurement tabs in REW. REW is installed and running in a newly installed WIN10 64bit system which is running on my old ThinkPad T410 laptap. And the error messages is copied: REW...

It's the only one available.

I will tried to decrease the difference tomorrow. This is a bit complex for me,should I open the sound card? My current sound card is Beringer UMC 202HD which was mentioned in this thread: Measuring Frequency Response and Distortion of amplifiers （4x150w RMS and 4x80W RMS） I can find the...

Hello John How's it going? I have several audio electrolytic capacitors for output ripple control of my AC/DC converter. And I got to know ESR value of electrolytic capacitors is the most important thing for ripple controll in DC filtering circuit. So I tried to measure the...

I tried to measured the amp. Connection Amp output level, still too low. SoundCard settings: Frequency Response: Distortion:

5534 opamp is a bit complicated for me. Acturally, I can try to connect the output of UMC202HD to a CD player with a high quality preamp such as Pioneer P99 which can provide 4-5V RCA output to the amplifier I will measurement. With High pass and Low Pass,the result looks better with low...

Hello jschwender, Happy New Year! This UMC 202HD has too high 2nd distortion, I cann't increase the output level much, cause distortion will increase quickly, but if the output level is too low, the amp which will be measured will have a low output level. Maybe this is not good for...

Hello trobbins, Happy New Year! I changed settings in REW and decrease the GAIN1 to the level near Min, and improved the measurement. Phones is the output, GAIN 1 to min (near) Because levels below -12dBFS are too low for output, so I choose -6dBFS Looks not too bad. 2nd 0.0068%...

I change the output and use PHONES as the output like this: -15dBFS is a good starting point. 2nd Harmonic Distortion: 0.0090%, but the output voltage of PHONES is only 0.004V.:(

For LEFT line output, signal 1KHZ SINE The output voltage is 0.005V @-19dBFS, it's too low. :rolleyesno: I increase the level in REW , the output voltage is 0.251V @ -6dBFS.