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I'll close the loop on this one by saying I have called this one "complete" (for now ;)) with: 9.4v input "mod" = 10k resistor and B1M potentiometer replacing R15 max bias on Q3 collector = 3.27v min bias on Q3 collector = 0.367v 2.5v bias achieved at approximately 11:30 on bias knob 2.7v bias...

OK...just swapped out the 100k I had in series with the B1M pot to replace R15 with a 10k and the voltages now range from 0.38 - 3.75v. I still don't get the gating I had hoped for but I do hear the slightest variation and, as Chuck stated, maybe there might be a little more once I start...

Thanks @Chuck D. Bones. I will continue to play around with this one but will focus my attention on that R15 resistance rather than worrying about the other aspects of the circuit around Q3. I am using a D9G diode in D1 and, as you describe above, I believe it has a band on the anode so my...

I was hoping to get a sputtering/dying battery type of effect but, as Chuck is saying, maybe this isn't the circuit to do that with? For the record, the sound of this build (once I got the transistor oriented properly) is VERY good to me and I have other pedals that do the velcro/sputter quite...

So, after tackling a couple of other builds, I finally managed to get my Marigold put together using the B1M and 100k resistor mod that @Chuck D. Bones recommended. At first, the external bias knob was having ZERO impact on the Collector voltage so I double checked the pin configuration on my...

The bias section of this circuit is new to me so thanks so much for the explanation, I really appreciate it. In terms of more details on the values you've recommended, I assume that the R15 swap to 100k ensures there is always be SOME resistance in that feedback loop but, with that in place, I...

Thanks @Chuck D. Bones. Are there any reasons why you would prefer adding adjustment to R15 rather than R12 or R14?

Thanks @Big Monk . The schematic shows R12 (1k2) and R14 (3k3) tied to Q3 (along with D2 (4V7)) and from what I have read on the PedalPCB threads where they traced this circuit, folks are recommending a Q3 voltage of about 2.5V. My IMPRESSION is that R14 would be the likely candidate to...

Any suggestions on the addition of an external bias control for this one?

Hi everyone, Slowly getting back to my build projects after our move last fall and one of the first things I'm going to tackle is the Marigold. I love having an external bias control to adjust how smooth or spitty the fuzz sounds so I'm wondering which resistor would be the one to...

OK...closed jacks installed and the interaction between the tip of the input plug and the Tempo switch is gone. Tick was still present and I noticed it got louder if I moved the input wire close to the LED wires on the 3PDT switch so I swapped the input and output wires and that helped reduce...

I bought 3 from Tayda knowing this was a possibility. I've tried all 3 and I think the first one might actually be the most quiet! I'll definitely keep all three...especially now that I know their issues can be build specific! My next test is going to be installing fully closed jacks when they...

More work on this today and it's still kicking my butt! I re-routed the power leads for the TapTation board, moved the input jacks all around, tried a new battery test supply i just built based on the suggestion from @flemming and even tried using one of the "closed" jacks I had lying...

Don't worry, it's all on me (ha ha ha). I just ran through a similar fight with a custom build...the thing was broadcasting AM radio like gangbusters in my test rig. I finally gave up and completely boxed it up...dead silent after that! I should have probably just been happy knowing the...

Well...I went down to see if I could test your question with a battery attached to my daisy chain cables (Power-All provided at snap adaptor) and it wound up blowing the L78L05 on the TapTation board (TWICE!). Sad that it took two strikes for me to realize that a battery attached to that...

Well...I tried a few different things (including the addition of shielded wire) but it seemed like grounding the LEDs directly on the DC jack rather than on the circuit board got rid of the tick. I happily put everything back together, closed up the enclosure, plugged everything in and the...

Hi folks! Following up on this one now that I finally finished building the circuit and boxing it up. I'm really happy with the way it all turned out...delay sounds great and the TapTation board does everything it promises. I used the 1K resistor on the Cataclysm board (R15) and the 100k pot...

:ROFLMAO: That's funny...I'll let you save face and avoid asking...;) Huge thanks for sharing the other details though. I'm pretty sure I'll build a stock Trumpeter at some point but, for now, this is a huge help for me in terms of trying to put together a DIY "Rotobone" for a friend.

Thanks @coltonius, I appreciate the response. So it sounds like you used the X rotary to select cap options in place of C4 and C5 on the Trumpeter schematic...does that mean you left the on/off/on switch in place to choose between C6, C7, and no cap at all?

Hi @coltonius. First...all three builds look very cool and I'm definitely inspired! I just had someone ask me to put together a Mini-Bone/Trumpeter with options to fiddle with various components (such as the input and output capacitors as you have done here). Can you please confirm if I have...