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Old 30th November 2012, 05:18 PM   #71
manina is offline manina  Germany
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It's a DSO203

Seeedstudio Forum • View topic - DSOQuadV2.6 RESOURCE(Update 2012/04/12)

You can find a manual in the first post of this discussion. Counting from the bottom of the file list, it's the fifth
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Old 30th November 2012, 07:58 PM   #72
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Set the timebase to auto and the vertical amp to 5v/div. Ground the probe to the ground terminal of the amp and touch the probe to pin 9 of IC1. Post a screen cap of the waveform.
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Old 2nd December 2012, 11:43 AM   #73
manina is offline manina  Germany
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This is the waveform with no load.
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File Type: bmp IMAG004.BMP (47.0 KB, 13 views)
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Old 2nd December 2012, 04:04 PM   #74
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Confirm that the tabs (or center legs) of Q3 and Q4 have the same signal. If they do, post a photo of the waveform on the tab of either transistor both loaded and unloaded.
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Old 3rd December 2012, 05:19 PM   #75
manina is offline manina  Germany
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There is no difference between loaded and not loaded but there is difference between Q3 and Q4 - see attached files
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File Type: bmp IMAG005.BMP (47.0 KB, 4 views)
File Type: bmp IMAG003.BMP (47.0 KB, 6 views)
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Old 3rd December 2012, 06:49 PM   #76
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Set the scope to DC coupling (not AC coupling), 10v/div and post two photos. One with the probe on each end of D2.
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Old 4th December 2012, 03:15 PM   #77
manina is offline manina  Germany
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These are the two ends of D2 without load - with load they looks pretty the same
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File Type: bmp IMAG001.BMP (47.0 KB, 4 views)
File Type: bmp IMAG002.BMP (47.0 KB, 3 views)
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Old 4th December 2012, 04:57 PM   #78
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Post the waveforms for Q3, loaded and unloaded. This time, make sure that the coupling is set to DC. You will have to set the vertical amp to 10v/div.
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Old 4th December 2012, 06:26 PM   #79
manina is offline manina  Germany
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number 1 is the unloaded while 2 is loaded
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File Type: bmp IMAG001.BMP (47.0 KB, 8 views)
File Type: bmp IMAG002.BMP (47.0 KB, 6 views)
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Old 2nd January 2013, 08:55 AM   #80
manina is offline manina  Germany
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I guess I have no hope to fix it
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