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1..2..3.. let's go First of all - its big, it's dangerous (almost 300V to power the tube) and rather expensive to build (compared to regular pedals). 1. Project, schematic, etc. It's all available from freestompboxes. Schematic (four separate pieces) and pcb layout (Sprint Layout format). 2...

Thinking about EQ type patch for the FV-1. What I need - bandpass filter with two notch filters. For example: 100Hz to 5kHz with notches at 500Hz and 2kHz. Each notch has fixed frequency, fixed Q and adjustable depth (from zero to -10dB). Is it possible? Any tips?

Calling Eagle freaks... I'm trying to design a fooprint for a slim audio jack. I'd like to use oblong holes/slots instead of ordinary big holes but Eagle does not support oblong holes. I've seen couple of solutions but I couldn't find a clear answer - which method is proven and working. As for...

So.. I imported the board from Eagle to Kicad 7. In Eagle, the vias have thermal reliefs, but the thermal reliefs disappear after import. Any idea how to add them? There is nothing in the element properties. Thanks

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.