I have copied this from the SOAP thread as it might grab a wider audience.
Can any of you geniuses out there (a few regular posters spring to mind) give me a definitive answer as to whether this board (SOAP) has any DC blocking on it.
I had a problem with mine at the weekend and when testing/playing with it, it blew an old speaker! A strange noise and then....phut!
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Can any of you geniuses out there (a few regular posters spring to mind) give me a definitive answer as to whether this board (SOAP) has any DC blocking on it.
I had a problem with mine at the weekend and when testing/playing with it, it blew an old speaker! A strange noise and then....phut!
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Andrew. I did try to get one from the SOAP thread, but it does not seem to want to work. Zei who made the boards says there is DC blocking on the output. If you look at the last few posts on that thread you will see that the problem may have been the way I had it wired to the pot.
Why thank you. I have tried wiring the SOAP the other way as suggested by Zei and it is still playing up!
Puffin said:
Yes, it has DC blocking at the non-inverting input and at the output. That is, if you built it according to the schematic Tripmaster attached.
DC is not the only reason, why a speaker would blow. Did you actually measure DC at the SOAP's output?
Your power amp obviously has no DC protection of its own. Did you measure, if the DC is coming from the power amp?
Could it be that the voltage regulators offset the ground, because they are slightly disadjusted? Then you could indeed get DC at the output through the 100k resistors.
Was the attenuator full open, and the signal too strong for the speaker, because the SOAP adds a gain of two?
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