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Yes you're right. I did a spice analysis. If I change R4 to 15k: Gain increases from 7.3 to 9.8 Center frequency of that gain stage shifts from 4.6k to 5.3k (with pot maxed. However it's important to note that the center frequency shifts anyway with the 100k pot. See below. Graph says volts...

Another idea would be to keep the low gain 1k, and change R4 (27k) to 15k. That in parallel with 33k is about 10k. Would give a max gain of 11, and still a min gain of 1. I’m gonna try this tomorrow. Note: I hesitate to mess with R5, I think C3+R5 is a filter

I've been doing some digging into the different gain options for the King of Tone, Prince of Tone, PPCB Paragon, AionFX Pauper/Theseus, etc. I'll use the Aion Theseus schematic because it's easier to understand, easier to correlate to a non-inverting op amp schematic. Aion Theseus has the gain...

Part Termina Jan Ray Tommy III (different designators) C1 39n 47pF 39n C2 47pF 22pF 100p C3 100pF 47pF 100pF C4 39n 33n 39n C5 1uF 820n C6 10n 47n 6n8 C7 2n2 150pF 6n8 C8 1uF 820n C9 47uF 47uF C10 100uF 47u C11 100n omit R1 510k 1M 1M R2 3k3 33k 3k3 R3 9k1 R4...

I've been looking at differences between Tommy III and AionFX Termina (Timmy v2). Initially I thought the only differences would be the switch arrangement (internal, external, etc). But looking at the values, there are quite a bit of differences in values. The OP compares the Termina to the...

Next version... I was able to squeeze it down into a 125B, using a double stacked set of boards, 9mm pots, headers. No hookup wires! I designed it using SMDA with the intention of being able to assemble them in under an hour. I had one major problem to solve, @Robert & @joulupukki helped me...

Here's chatgpt's answer: Why electrolytics pop more than film caps 1. Electrolytic leakage current is orders of magnitude higher A typical small electrolytic (like your 10 µF): • Leakage: 1–10 µA is normal • That leakage charges the node feeding the 3PDT • When you stomp → the charged node...

Also so what is it about electrolytics that makes them cause pops and film doesn't.

Tagging @joulupukki

Well, that worked! 2.2u and 10k to ground. Interesting, if I click it a few times in a row I hear a thin click. But give it 5s and there's no click. So that means it's bleeding off but not fast enough if I click a few times in a row? That's a cutoff of 7 Hz. I could lower the 10k down to 2k...

I've got some 2.2u's

Maybe swap C10 for a 1u ?

Lasted about 30 seconds, but eventually the charge built up.

Please elaborate. Wouldn't R2 serve as a PDR for C1? It would be easy to add a 1M across the tip and ground of the jack. Should R2 go BEFORE C1? I guess I don't understand the difference for a non-polarized cap.

I fixed the schematic above to show pin 6 of the 3PDT is grounded in bypass/mute. I'm using a PPCB breakout board for the switch.

Hi, I have a circuit I've been working on. Newest iteration has switch pop that I didn't have before - this is usually considered DC offset across the switch hitting the audio path. I've simplified the circuit to just the below, a JFET and buffer. The switch is simply wired as a test case, to...

Here is a *terrible* demo. I thought my iphone would do better, but it doesn't capture what I was hearing at all. When I was demonstrating the notch, it was really feeding back hard, but you don't get that in the video. You can kinda hear the variation in the low end, but the variation in the...

Pricey as hell is right, that's why I started this whole thing. Felix is amazing, but wow, not worth that price. After years of experimenting with dual-source, I have moved away from that and simply use IR on my piezo pickups. Sounds better, simpler, no feedback issues, etc. Back then I always...

Sure I could do a simple walk through video, in True Bypass to hear with it on/off (should sound the same), play with some of the knobs, etc. Maybe later this week.

Theoretically, sure. But it wouldn't be simple. The set HPF could easily be removed to allow full range into the first gain stage. But most/all the EQ stages would need to have the frequency range adjusted. At the very least, the HPF/Notch range would obviously need to be lowered since right now...