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Besides the 6002, this seems low to me. I'll check mine when I get home tonight. I have closely looked over your board and I can't find any mistakes. The ribbon cable is right. The diodes and Pcaps are orientated correctly (although some of the diodes are in the shadows). The resistors look...

Right. It's not tuning because the 6002 isn't working, because it doesn't have enough voltage. Probe around the junctions on this part of the circuit Specifically, check the voltages on the pins of IC7.

My ALL-DIY setup for leading music at church this morning. I guess I need to make my own DI and Bluetooth page turning pedal. I’ve seen DI kits, but not page turning pedal kits. Maybe @joulupukki can help me with that.😎

Funbox Neptune Reverb/Delay, based on Daisy Seed You can flash the Daisy to any of his 10 predefined modules, or download the software and built your own like @joulupukki did for Flick. I designed the UV for the Neptune Reverb/Delay The unique thing for ME on this build was the use of...

Well, Aion does it, and my prototype does it. Seems fine. Maybe it’s not necessary.

Yeah I did the same thing, copied L5 preamp. Take a look at the Traco tech notes, they aren’t exactly like the Aion schematic, they only suggest 1 inductor on the input, not both output legs.

The biggest problem with pcb v3, is the 3PDT footprints, I had to modify the 3PDT's for them to fit. In hindsight, I could have simply drilled out the holes to 2.5mm, like this, now they fit. If anyone wants to built this, it all seems to work and with this modification shouldn't be any...

I was checking the current because I'm using a Traco TEC 3-0923 DC-DC converter that takes 9vdc to 2 legs of +/-15vdc. It's rated for 100 mA per leg and 3W total. It's applying +/-15 v to the 4 op amps, or 30v across each. I have 1R resistors inline to measure the voltage and calculate the...

Spent an hour playing it. First impressions, it has a TON of gain between gain (first) and volume (last), not to mention boost. Anyway loads of headroom. Drives me crazy when I’m plugged into a system and the sound guy wants more gain than I have. Sounds real clean with the TLO74s. I’ve got...

I've never seen this before, but damn that's smart. I'm assuming installing resistors/diodes vertically it's to make it easier to: a) probe b) remove Anything else?

Last night I spent a couple hours measuring the frequency response of each knob/section. I am somewhat shocked, but it all works as I designed. The scope bode plots match what I designed in LT Spice. Next steps: 1) finish wiring up the footswitches 2) play it for many hours, in different...

I know nothing! Great show. My last name is Schultz, so I can identify...

Off the cuff, the opamps could take +/-18v, but I can't find a DC-DC converter that provides that. Options seem to jump from 15 to 24v, and 24v would be over the op amp limit.

Well, it's +/-15 volts, or 30 volts total across the op amps, which many EE's would say is WAY overkill. I've literally argued about this very issue on Allaboutcircuit.com. Me, an ME arguing with EE's, I'm definitely outgunned. Grace Designs is kinda the pinnacle for acoustic preamp design...

Here’s a bode plot measurement of the Q-tune buffer. Green trace from 75 hz to 10 kHz.

Here is a similar representation using LT spice:

An update, I finally bought a good AWG (arbitrary waveform generator). This AWG and scope combo allows me to create bode plots very easily - the scope tells the AWG what to do via USB (freq range sweep, amplitude, etc). This literally took me 10 minutes to setup and I'm a rookie at this stuff...

Here's another comparison with Canvas included. Something odd happens with Canvas on some notes, it's a small error but considering that the other 4 tuners are rock solid together on a waveform generator, it is strange.

I did some tuner comparisons a while back, comparing Q-tune, Peterson, Turbo Tuner and Polytune 3. https://forum.pedalpcb.com/threads/comparison-of-tuners-and-q-tune.26108/