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In Reply to: RE: But wait: there's more... posted by rivervalley817 on October 18, 2020 at 20:41:32
As drawn, the negative terminal of the 22uF cap is tied to the positive terminal of the DC voltage source. When an electrolytic cap is reversed biased as this one would be, the insulating oxide layer breaks down and the cap becomes a resistor allowing DC current from the voltage source to flow thru it. This situation typically damages a polarized cap and may cause the cap to fail with a spectacular and messy explosion.
Follow Ups:
'the negative terminal of the 22uF cap is tied to the positive terminal of the DC voltage source'
yes, that's the direction of the current flow ... the whole DC circuit 'flows' to the positive of the line level source, which actually carries the 'negative' audio signal right? the line level's negative flows to the negative terminal of the battery ... are you saying the battery should be reversed as well?
when you say it converts that bi-polar cap to a resistor I agree, but that circuit is also treating the battery as if it was a 'pre-charged' capacitor, and the whole thing is dumping DC into the line level source in reverse ... I was thinking that bi-polar cap should just be a high value resistor instead ... on the other hand it doesn't make much sense to reverse charge the line level output ... that seems like 'bad ju-ju' to me
regards,
Do you see DC current flowing anywhere in that circuit????
Dave.
is that not a 9VDC battery in circuit? is there any switching inverter circuit there?this thread took off because 1973Shovel was concerned that 9 volts weren't enough correct?
what am I missing?
Edits: 10/19/20
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