Recent content by micmac

Hi Chuck, Sure, pic attached. In my opinion people in general mean magnitude when they say "higher VP" or "lower VP", like "2 is higher than 1", or "1 is smaller than 2", but they know that Vp for n-JFETs is negative, so mathematically "-2 is smaller than -1" and vice versa. So when you...

Just to add a small curiosity (a positive one, actually). I was looking through my J113 "collection" to find one for Q1 in the Viceroy that would bias up to 5V on the drain using the resistors from the schematic (10k drain and 1k8 source). The SMD ones I tested didn't bias right, VP too big. But...

Hi all, Here's a vero for the Britannia CB mod. I followed the version 1.2 schematic in the Boneyard. I stuck a 470nF ceramic in the power filtering section, because there was space for it (it's on top of the opamp) and it never hurts. The Brilliance pot I renamed to Presence, as per Chuck's...

Finding J201 transistors that biased up with the given resistors went pretty quick. The 2N5457 was harder. I tried 50 SMD equivalents and only four or five went over 5V. One of them went up to 5.8V. It has a pretty high Vp of a little over -1V. So I decreased R3 to 3K65 and that was that. The...

Thanks! I got a bunch of J201. I should be able to find some that bias like yours then!

Hi Chuck, I'm wondering if in August '25 you used J201 for Q2 and Q4 and the drain/source resistors from the schematic above? Or did you use SK193 & SK193 like earlier?

I built the sig generator from Valvewizard in '24. It's got a pretty good range and I like that I can set the output volume. The oscilloscope in one of the pics also has a sig gen, but you can only select the frequency (and also it offers other shapes than sin, which the Valvewizard does not)...

I just pulled the cable out of my speaker (amp was off) and measured sleeve and tip for continuity. DMM started beeping and showed 4 to 9 Ohms resistance.

Isn't that to be expected, given the output towards the speaker have a very low impedance, like 4 or 8 ohms? I never built an amp, so I might be wrong. But if there's just 4 Ohms or 8 between your DMM pins it might just start beeping.

Hi all, Here's a vero layout for this rock machine. Thanks for sharing the mods to CB! I checked the voltages in my build and they look good. It also passed the IDSS check that is described in the Boneyard thread. It was a fun and rewarding build! Great sounding overdrive. All the best...

Actually, 100p is barely noticeable, even cranked. I sort of liked 330p. But I play Volume high and Drive at 9 o'clock, so that's why. But I mean I just put a socket, it's not baked it. Can be changed to taste.

I know

Actually, let me add one more thing. I was also playing with status LED switching on the breadboard, because I had seen people add a cap sort of into the LED resistor, like here for instance. So I tried it out, but I could still hear the switch action. Then I had this idea to do the switching...

Hi all, Fan of the SD-1 here. I built the PedalPCB Oddity and am actually liking it a lot. Sure, no tone pot, but the way it's set is fine. It's tight (Tuco from Breaking Bad comes to mind). And one less knob to worry about. After I built the Oddity I put the circuit on a bread board. I...

Hi! Maybe audioprobe the board to find out which part produces the ticking? Last weekend I put something on the breadboard and it worked fine alone. But when I connected another pedal to it it went crazy making a loud popping noise. Turned out it was something stupid, I had connected the output...