| The Shop > Electronics & IC Programing |
| Digital oscilloscope project/kit |
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| John Rudd:
Lyn, I suspect the scope has suffered a death blow.....your wall wart thing must have too many ziggies coming out...... Things to check: The voltage at TP 20 needs to be near that indicated on the schematic........ Check the voltages around TP21 and TP23.... Measure the voltages around Q1 and Q2... |
| John Swift:
check the 3v3 at TP23 this is the reference at one end of R42 (1K) the junction of R41 and R42 is the feedback voltage going to the V-MON input of U1 an error at V-MON = TP13 = pin 16 affects the actual voltage at TP25 the -8V supply the actual voltages measured depend on the positive supply at J 9 and J10 I'd expect the voltage on TP13 to be about +2V when the -8V switching supply circuit is working correctly |
| John Stevenson:
Just got one of the transistor / components checkers delivered from China. Bought the ready made up on as it was only a quid more than the kit ??? However no paperwork or instructions, anybody got a link to some somewhere ? |
| kayzed1:
Many thanks all, i will have a play on Friday. John S, PM me your address i got two sets of destructions in my pack i will stick them int post. Lyn. Ow! John R, does that mean ( the high volts ) that the scree will be an EX- screen now? |
| John Rudd:
Lyn, Not the ex - parrott sketch.... :lol: The extent of any overvolts damage cannot be determined without further checks and possible component replacement to resolve the existing problems... |
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