BabyBlueSound

I see a lot of flux residue on the photos that is barely visible with my naked eyes. I guess I should really clean that up first with some IPA... that residue can be shorting all sorts of stuff right?

The photos won't do too much good, had to remove it from the wired up enclosure and bleh... it's uglier from close up than I remembered. But all ins and outs should be correct, I have done a connectivity test on every node again. All grounds "see" other grounds as well. However I finally found a measurable difference. The transistor is sending 0.6v to ground on BB but 1.1v on the PCB. As a result, 3.8v is going towards the OUT on BB but only 1.6v on PCB. Also, the signal is not consistent on the PCB, values keep jumping around randomly (which aligns with the poppy noise) while it's very stable on the PCB, no fluctuation. Not sure what the V difference is due to and if that's the problem or a symptom. Also don't get why am I getting noise even when directly probing the JACK IN...

The noises seem to be coming from somewhere else, there's a constant crackling and buzzing on that PCB. I guess something is shorted/grounded or a joint is busted, but if the circuit is not bypassed, my probe is terribly noisy even when measuring on the very input jack itself! It all sounds fine on both jacks of course if I bypass the circuit. Since it's all wired up, I guess now it's time to desolder all the pot wires and try to reflow the joints. But since I already checked for shorts before wiring it up and all seemed good, I don't think I'll be able to fix this, seems more and more far every day.

I got it from a fellow Basschatter very recently! I was just about to turn off the extended EQ, I'm like what do I need the high 8k for, just makes the menu more confusing. You're saying I shouldn't do that? 😁

Alright I have probed again and there is no audio coming from pin 7 on the breadboard. 🤯 Must have made a mistake in my notes the last time. Audio is only coming from the pin 6 output as expected. I'll review the PCB again and compare the 2.

Again, I'm equally confused by this, but the properly working breadboard version of this same circuit (which I have linked a couple comments ago) also has audio on pin 7. I get that pin 7 should be only connected to the power rail... To clarify, I also swapped the OP07 between the breadboard and the PCB one to make sure it's not an IC issue, and there were no changes. Breaboard continued to work, PCB continued to weirdly distort.

This PCB has a Ruetz that's handled by a trimpot, I think I tried that already, but will give it another go. I used Fuzzdog's own PCB. And I thought the same about the IC and VA, but the breadboard version does not do this crazy distortion on leg 7, neither does my other (non-operational) Fuzzdog PCB attempt. It's only this latest version that very angrily distorts on that specific leg. And the same A100K pot works completely fine on the breadboard, no short operational range there. Now my mum is visiting so have limited time, but I'll measure some more voltages, probe some audio at various points, and will try to play more with the Ruetz trim. Also, I still haven't fully tested the first attempt, which failed somewhere else. If all else fails, I got 2 more PCBs I can give a try...

Oh my god, this must be able to make every simple sound in existence. I just passed on that C4 as I just got the same bass envelope filter 😅 and here you are, running both, I'm so jealous

If I wasn't blue, this would be my chosen colour! So beautiful. And you got 2x the knobs!

Of course not, Danny is very transparent about making money and getting views on youtube. Nothing's wrong with that if it's genuine content, or even happens to expose fakers like in this case. Ad/sponsor money is somewhat a zero sum game, there are limited budgets and large companies should not spend that sweet advertising budget on fakers, when they could be boosting the real artists.

Why do you need a clock on the board? 😁 I mean I love the idea but curiously wondering if there is any specific requirement this serves.

wow he even turned his always-backwards baseball cap around for the "apology", so the bro must be genuine 🙄

yea but when they rupt then we have to bail them out...

I'd assume any Sandberg can do metal (them being bright basses by default), especially if you hook it up with a Sansamp for additional saturation and OD.

This seems a bit "off topic" though, like that other tariff post. No offense but I come here to read about basses and switch my mind off. If I want to get anxious over the state of the world, I can just open literally any news site and get depressed in a half second. No need to remind me of all this when trying to bury my head in bass... 😅

It is a commercial (Fuzzdog) PCB, and yes the same works perfectly on the breadboard which I still have around for audioprobing and multimeter testing purposes. Visual inspection does not show bad solder joints, so might be lurking under a solder blob, if that's that. I'll also do comparative voltage measurements between the breadboard and the PCB, just had no time yet.

Boss Tera Echo 2! The weirdo digital reverb. I thought this will be useful mostly when I want to record some spacey guitar backing track for myself, or drone around. I was wrong, welcome to the board, Mr Always On! If I turn the effect volume down a bit, then set feedback and spread time to minimum, it just adds a very nice "body" to the sound by adding just a tiny bit of roomy reverb. It just makes the notes sound more exciting. CAN'T TURN IT OFF NOW!

I am trying to build a 3band RAT, and I messed up my 2nd build as well, even though I managed to get it work on a breadboard. I am using an audio scope to find where the PCB starts to differ from the breadboard. I found that leg 7 of the OP07 reacts to distortion in a weird way (clean when down, SUDDENLY overdistorts at a certain point, despite the linear A100k pot). However leg 7 is the V+ leg of the IC, not for the audio signal. Do I likely have a problem with the power section of the circuit? As I'm extremely surprised I found the overdistortion issue on this specific leg... It's not an output and is not directly connected to the DIST

Maybe they're converting to a pyramid scheme and just want to make a few new sales to pay off the old creditors 😅

I can only add to the Sandberg crowd, I am in love with mine!

@ped this almost sounds like a market gap for a new, proper gear page 😉

I had 30 minutes to kill in London a couple weeks ago and really enjoyed visiting Wunjo Guitars on Denmark street. Nice staff and a lot of stuff to look at, interesting pedals, some beautiful basses.