Yesterday I made the Safety Valve 2.0, but unfortunately it is not working
While checking the stripboard and the schematic, I noticed that on the stripboard the pins 4 and 5 at the valve are mixed up (can someone doublecheck?)
I fixed my stripboard but still no sound. When I measure the output, I only get a constant 12V. When try to ‘follow’ the sound (I just use a cable which goes into my mixer) I can hear the sound very lout after the first stage of the valve and going into the second one (at pin 7) but at the output of the valve and into the opamp it is very quiet. Is this what I need to expect? Then it looks like the opamp just ignores the input and sends out 12V at its output… Any ideas what to check?
I changed the TL071 for a TL072, which I had lying around and changed the stripboard accordingly, but this should make no difference, right?