Search results

Wow! That vero looks super clean!

Nice build report, @mybud !! I have built this one with 2n3819 and have found it a bit underwhelming (granted my 2n3819 vary wildly in specs - as do 2n3819 per the datasheet) I subbed in some 2sk304 (somewhat similar in specs to j201) and like it much better. It's still a bit too bright for my...

In his amazing thread about jfets, Chuck has lectured me briefly about transconductance information in datasheets (https://forum.pedalpcb.com/threads/jfet-biasing-part-1.5177/post-143159): what matters most are Vgs-off and Idss (that you use to calculate the gain of a fet stage). In the...

I'm guessing he's referring to C1-C5. I'm guessing the board was laid out to accomodate either axial or radial capacitors. There's continuity between the pads closer to each other

You've probably saved me from frying an IC in the breadboard (which is not to say I won't fry others)

Nice, Chuck, thanks for the input! I hadn't noticed the source pins at 4V, if I was to use only one of them (say the one with source on pin 7) as gain control, would it be possible to connect pins 9 and 4 to 0V?

Are you guys (especially Chuck, since I had originally posted it on the Boneyard) familiar with the Maestro Fuzztain? It uses the N-channel mosfets of the 4007 in parallel as a variable resistor in the compressor part, if I understand it correctly. Do you think there is a very solid reason for...

Love the colors on this one! Nice job!

Finally had the time to etch it. Will hopefully build it this weekend

First of all, that build looks amazing!! I'm looking forward to hear it in some of your amazing demos If I'm not mistaken (and I could very well be, it's late and I had a couple beers), the rullywow jfet matcher does not provide vgs-off values, but rather the voltage value at which the jfet...

+1 for Clube da Esquina! I find it to be one of those life defining albums

There's also one called Blüe Monster, by Vallhagen. It's not triple band, though, just two. Uses a cd4049 for generating distortion

For the time being, the plan is to build a single one, but even if I decide to build another, it's a simple circuit to breadboard and bias

I've been using 2sk304-C in place of J201 with good results. Not all of them will work perfectly, but a lot will For me, 2SK118-R are easier to find, and they are the same jfet in a different package With through hole 2sk fets you just have to mind the pinout (typically dgs instead of dsg)

I tend to take the same approach regarding the ground plane, but I've read somewhere that it could cause ground loops sometimes... I've biased the jfets on my breadboard. Q1, Q3 and Q4 are actually pretty matched, that's why the drain resistors have the same value, and as I'm taking it from...

Nice, will do that! Thanks! Will double check and etch tomorrow

Board is designed: It could be made smaller, but I have a 1590bb waiting to be used. I don't have much experience designing boards for high(ish) gain stuff. Any obvious non-desirable practice? I will use shielded wires and board mouted pots I have decided not to use the buffer for now, might...

So, after further testing, I've added the diodes before Q2 and Q4. I'll probably keep'em, or at least make them switchable. I've tried your suggestions on the 2nd stage and decided to remove the cap altogether Finally, I've decided to use a 1k in series with a 1uf cap in the 3rd stage, in place...

Awesome, Temol, thanks a lot! In the datasheet, values of -Vgs(off) range from typical=1V to max=4V, with no mention of minimum values. So I guess both 0.9V and 1.728V are reasonable. Idss also varies largely: the ones I have range from 0.6 to 1.5mA (C-type), but the 2SK304 in general ranges...

That's amazing! Do you have a spice model for the 2sk304? If so, would you be willing to share it?