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hi all, im looking to build a 10 band eq based on the 6 band eq pcb. im wondering if this would be achievable just by adding another tl074 quad opamp? would it work if i added another tl074 and bandpass filters like the below, and then adjusted the values of the existing ones to new frequencies...

Hi all, Having a small issue with the pendulum harmonic tremolo circuit. The effect seems to be working fine, I swapped the volume pot out for an A50K to limit the volume a bit and it sounds great. The issue is that when my guitar volume is at max there’s a crackle on the string attack. This...

Thanks so much for the response! yeah I found that the pinout diagrams for the L78L33 voltage regulator aren't all that obvious, definitely going to be double checking from now on! When the circuit was working it worked for about half an hour before I turned it off. It was only after I boxed it...

Hi all, Ive been having an issue with a clone of the hydra - i drew this up in diptrace and ordered some boards from JLC. Side note that this is a one off gift for a friend lol I already have a hydra i built with a PCB from pedalPCB, and i managed to get this one working just the same until...

I fixed the connection above and after remaking the board with fresh components I managed to get it working. I was really stoked as the sound of the hydra is incredible. But alas tonight I boxed it up, plugged it in to test it, and the voltage regulator burned out. This hadn’t happened when I...

I think I’ve found the issue, when I was tracing the circuit it looks like I listed the 3.3V common ref to pins 6 and 8 of the FV1 differently to the 3.3V coming from voltage regulator, I’m gonna retrofit a connection and see if that solves the issue

Confession time lol, I’ve been having a go with diptrace and getting PCBs through JLCPCB which is what I did for this circuit. I have a hydra PCB and eeprom which I bought from pedal PCB and I cloned that eeprom to use here. The eeprom works correctly as I tested it in my working hydra, and this...

Hi all, I’m having an issue with my hydra circuit where the speed control is acting as a tone control instead of a speed/time control. When turning the ‘speed’ knob up, the delayed signal sounds filtered rather than any change to the time between repeats. The rest of the circuit works as...

Thanks everyone for your help, I managed to get it working and it sounds great, cant wait to get the design done!

Sorry I should clarify, there’s no sound at all Thank you for the help, I’m making so many mistakes with this one 🤦‍♂️ I completely missed one of the 15k resistors when swapping them out last night. I can’t wait to get this properly working though so will have to correct this when I get home

i have the wet delayed signal when the mix pot is turned past 9o clock but when it is fully counter clockwise there’s no sound

Thanks for finding that issue, correcting those resistors has sorted the volume and background noise issues, but now I don’t seem to get any dry signal, I think I’ll reflow the fv1 solder joints but is there anything I should look for?

they seem to be 1.5k, i dont know how i got that wrong so will change them out tomorrow, how could you tell they were wrong?

Hi all, I just finished building my 1st FV-1 build - the hydra delay - and I’m struggling with a few issues. All of the controls and delay heads of the pedal work and I followed the build documents without any modifications (until I switched it on and had some issues) but the problem I have is...