Just curious

Dire McCain

Well-Known Member
If the voltage on opamp or IC or transistor pins in circuit check out to spec, does this necessarily mean that the component is functioning properly? Conversely, does a bad reading necessarily indicate the component chip is faulty? I think I know the answers, but since my brain has shrunk, I want to ask someone else..ha
 
f the voltage on opamp or IC or transistor pins in circuit check out to spec, does this necessarily mean that the component is functioning properly? Conversely, does a bad reading necessarily indicate the component chip is faulty?
Yes........ No..........Perhaps.........Possibly...........:biggrin:
 
Audio or logic IC? Some logic switching ic's don't get activated until something else sends a signal thus 'and or nor' logic ic's are sort of momentary on /off but voltage to said ic would show inactive on a dmm until x event happens.

That should 'shrink' your brain some more? :D Very common symptom among the DIY addicted community.
 
Long story...njm4558DXn op amp related to power meters...both meters now inop...meter driver IC exhibits proper voltage on all 9 pins, including power coming in...opamp, as I undetstand it, feeds to both meters...one half of the 8-pin op amp each...voltage coming in to one pin of the opamp is correct..one is not...very low...there seems to be a bum transistor in the circuit...emiter should be 21.5...reads 5.1...
...naturally, I replaced the wrong damned transistor...waiting on a new one that is correct...hence the shrinking brain..first time I've been wrong about anything since January...right...
 
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