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Or a trimpot. I'm still tweaking the TREBLE control.

Yes.

2N1308 are too hot for some pedals, such as Screw Driver & Hybrid Fuzz Driver. The EGDM & EGOD were designed to use 2N1308 and sound good.

They work well in this pedal. If the VOICE pot is too sensitive, then delete C14 and try A10K.

I just can't get enough of Bjorn Juhl's pedals. There are two versions of the Blueberry pedal. V1.0 has the input feeding into U1. V1.5 has a JFET booster in front of U1. I breadboarded V1.5 with a few minor mods. I rewired the NATURE control as a BASS control and added a TREBLE control. I...

Do you like the TREBLE control? A25K might work better for the VOICE pot. I used 2N1308, they have higher HFE than MP38A (>100 vs 60-ish) and more bandwidth for more top end. Si will not bias correctly with the resistors values on the schematic. What's the voltage on Q2-C? Should be around 6V.

The 4117's Idss is extremely low, <0.1mA. This means the biasing will have to change when subbing it for 2N5458. It also means that the gain (gm) will be low and the channel resistance will be high.

It's also about power. If you crave power, you can never have enough money. It's kind of like a Coke habit; the more you get, the more you need. There is always one more judge or politician to buy. And private security. You're nobody if you don't have your own army.

That's my recommendation, take it with a grain of salt. I have bought a couple of PPCB boards that once I breadboarded them, decided that I would would never build them. Not every AIAB design is a good one. Maybe only 50% of them. This one is Meh IMO. Up until yesterday, I didn't have an...

Save you J201s for a better pedal design. Just my opinion. Some amp emulation pedals are better than others.

Greed is a powerful and ugly thing. The Most Selfish Man In The World lives here. He'll spend 0.1% of his wealth influencing elections, but can't be bothered to contribute the same amount to feeding the hungry.

Have you checked out the Viceroy? I describe it in detail here. The PF5102 JFETs are hard to come by these days, but J113 should work well for Q1 and 2N5457 for Q2 & Q3. IMHO, it does what the 1484 does, only better. A couple of years ago, I was listening to a blues band at a small outdoor...

If you use a dual C100K pot, Make C3 & C4 both 12nF. You'll get the stock 3.5dB mid boost which should be fine. If you don't have 12nF, 10nF is close enough. I had bumped it up to over 7dB and that was a bit much.

C2 was jumpered and R3 and R10 were deleted because they are unnecessary in the original circuit. Leave them in, take them out, the circuit will work and sound the same. when you say "I'm planning on building this..." what exactly do you mean? A stock Frost Drive? A Frost Drive with some of...

You built that per the FuzzDog schematic, right? They used a 47Ω source resistor on the last JFET. That seems way too low and pretty much guarantees distortion for any knob setting. I have it breadboarded.

Zeners have higher capacitance that other diodes, which could make a difference at higher DRIVE settings. Try a 1N4148 & a GE diode in series, that gets pretty close. Most Si transistor E-B junctions should work well. The B-C junction has a higher Vf, if you want that.

Apparently no one has built one of these yet because the schematic in post #1 had a serious typo. It's fixed now. If you DL'ed that schematic, delete it and replace it with the one above dated 29-Nov-2025.

JFETs are used as analog switches in Boss, Ibanez & many other pedals. They are used as audio amplifiers & RF amplifiers. You'll find them used in preamps inside microphones. They are used as voltage-controlled resistors in phase-shifters such as the Phase 90 and compressors such as in the...

I think it's just the nature of the beast. It's mainly due to the fact that JFETs are depletion devices, meaning that with zero Vgs, they are full on and to use them as amplifiers you have to deplete the charge carriers by biasing them towards off. JFETs are made from very pure silicon and...

R6 is the anti-pop resistor for the BOOST switch. It's R5 in the PPCB build Docs. https://docs.pedalpcb.com/project/MojitoDeluxe-PedalPCB.pdf