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| Digital oscilloscope project/kit |
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| John Swift:
Hi Roy just double checking when you say I can only get the display to indicate DC or ground. do you mean it does not show "AC" at the bottom of the LCD or the trace is a straight line if its not indicating "AC" at the bottom of the LCD then check the voltage at test point TP6 ( switch 1B terminal 6 ) +5V for DC +1.2V for AC and 0V for GND if its the trace not responding check C1 is 0.1uF (marked 104) if for instance a very small value capacitor that should be C2 , C3 , C5 or C7 virtually non of the AC voltage at the input connector will be passed onto switch 1A terminal 3 John |
| wheeltapper:
Hi John, thanks for the reply. It is the indicator on the LCD, it doesn't change to AC. I was going to do some voltage checks as soon as real life gets out of the way. :bang: I'll get back with the results. Cheers Roy. |
| wheeltapper:
Thar's interesting, I'm getting 3.8v on AC. I will look further. Roy. |
| Will_D:
--- Quote from: RobWilson on January 06, 2016, 05:49:24 PM ---DSO Manual attached for the pros to cast an eye over . Hope that helps ,Rob --- End quote --- Cheers Rob for posting the manual. I must say that is one of the best manuals I've seen in a while for such a cheap kit!. |
| John Rudd:
3.8v is too high....should be around 1.4v.....it looks like the software isnt switching as a result... I suspect the resistors are the wrong way round.... You need to check the values of the resistors in the chain...... |
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