Eclipse 36401

[Perry Babin]

OK. That's about right. What are you dong differently than you were in post #116?

 

[Cr@sh]

I was using my oscope for that reading of 6.83, and my dmm for the 22v. I think I just dont have my scope set right is all.

 

[Perry Babin]

If you connect a speaker to a channel and hold your meter on the same terminals, do you read significant AC voltage but still have no audio?

 

[Cr@sh]

 

[Perry Babin]

That's not clean audio but confirm that you hear a distorted signal from the speaker.

 

[Cr@sh]

No audio. I noticed I see that wave form on anything I check in the amp from tl494 to the ic's and on all bjt's. Ive ran the calibration tool on the scope and it checks out. I run a 60hz note from the built in generator and it shows nice and smooth. Im baffled as to what is wrong, unless the tl494 is bad?

 

[Perry Babin]

Are you 100% sure that the speaker is OK?

 

[Cr@sh]

yep, i run it directly to the radio in the pic above.

 

[Perry Babin]

Explain how you can have 2.35v AC across the speaker (driven into the speaker) and have no audio.

 

[Cr@sh]

Its got to be the scope isnt reading right. When i put my dmm set to ac i see nothing

 

[Cr@sh]

i have another scope ill try tonight and see if it read the same when set to auto, i agree if there's even a small amount of voltage there should be audio.