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I think it's time to face the KiCad after many years of using Eagle. And the appearance of version 7 of KiCad may be an opportunity to do so. I'm so used to Eagle that it's hard to switch to a different way of handling the design process for now. So far the problem for me is using the footprint...

Question: what's the J201 substitute for ....? Is there a J201 substitute? Answer: it depends :) I'd like to share my point of view for a J201 replacements, using Son of Ben an an example. So we're using JFET for amplifying signal (gain stage). But before I start with measurements, ltspice...

Looking for a DIY room-like reverb, with delay times up to 30ms. Could not find anything except FV-1 based projects or this one. I've played a bit with all-pass filters but could not get long enough delay. And the biggest issues is the noise (stacked op-amps).

I did not want to hijack the "TL072 substitute? (They're expensive now)" thread, hence a separate topic. Short visual and audio comparison between fake and genuine TL072 chips. Simple setup, one inverting stage. Genuine vs fake and LM358 for a comparison. Here some oscilloscope images...

Well... actually not blue. It's turquoise. But Blue Brothers seems a catchier name for the topic than Turquoise Brothers. Or PANTONE 313 C Brothers :) Here's my take on a Broadcast. Larger box - dual footswitch, smaller one - regular Broadcast. Boards of my design, same with the enclosures...

I have a circuit that requires a bipolar supply - somewhere between +/- 9-15V so charge pump seemed a good solution. But there are three 4558 (six opamps) to feed and each IC draws around 7mA. As for now I only have 7660/1044 charge pump. With 9V supply voltage I have +/-6 V from the 7660...

I'm looking at the Golden Falk schematic right now and I like that drain voltages are given. I assume they were measured in the original pedal. What was the Vcc value in the original? Because of the voltage reverse polarity protection we have less than 9V here. Is there also protection diode in...

I've always liked look of the 70s/80s electronic equipment with wooden enclosure elements. Sometimes I try to sneak it into my builds. Here's latest one - MXR Phase 90. And something older - Korg CX3 and Hoof Reaper

I'm looking for 2.5k linear potentiometers, pcb mount or solder lugs. And of course I prefer Tayda range price, not 2EUR for a piece ;) Spline shaft, round shaft.. 6mm.. 6.3mm. does not matter. There's 2k.. 5k.. 2.2k. available.. 2.5k is probably one of the hardest to find.

I'm curious how do you set the trimpot in your Phase90 clones. Trimpot affects depth and the way signal is modulated. What setting do you prefer? Deepest possible? A little bit nasal? Subtle? Here's the trimpot in action in my build. First clockwise, then counterclockwise. From zero effect to...

I've just noticed there's a Pathogen schematic available online (build doc). Is it really necessary to have separate reference voltage for each opamp? So far we had two at maximum, with REVV (G3?).

This is nice https://colomboaudioelectronics.it/prodotto/plexi-breed/?lang=en

What else can I say.. :) T.

That one is interesting. Soundwise and "programming" options. T.

A bit early to make a request but I post this just to let you now - there is a new pedal from Revv - G2 :) https://revvamplification.com/product/g2-pedal/ T.

What's the purpose of the split Vref in Tyrian and Sanguine? Tyrian especially - additional split to B and C. T.

Hi. I just wanted to confirm correct capacitor values for the Hicut switch - 2n2 and 3n9 (rev 01.01.19). Not 22n and 39n (rev 12.12.18)? T.

How about power amp in a box? Something like SD Powerstage, AMT Tubecake, EHX 44. T.

Question about Tyrian/Sanguine toggle switch. Classic / Fat / Tight - how to translate it to switch positions? There are three combinations - 33k||10k / 33k / 33k||33k. Classic in the middle position? T.

I've always admired neat pcb design. Symmetry of the layout, components grouping, etc. Bugg - can you shed some light on your design techniques, design process? T.