Saturday 10 June 2023

Madbean Headtrip 2

Once again, a guest appearance. Chris at CDC was brave enough to dabbling with some Spin FV-1 processors. Yes, these are SMD parts there is several vendors online that sell adapter boards.

 This one is VERIFIED.

 

Since I started building effects in 2020, there has been a "level up" step I've been avoiding. As the level digital signal processing that is available through industry standard effect makers like TC Electronic, Boss, Line 6 and Strymon filters down to the DIY/hobbyist level - there really is no excuse for not at least TRYING digital signal processing.

The most commonly available engine of these DSP effects is the Spin FV-1 reverb processor. They are about $10-$15 each and have 28 tiny little surface mount legs that need to be soldered to tiny little pads on the circuit board without any bridging. So I've been squeamish and avoided them. Until now (dun dun).

After about 3 years of doing this I felt like my dexterity and soldering iron proficiency had progressed to the point where I shouldn't put this off any longer. I also MUST thank DK pedals for their tutorial that was a serious confidence builder.

This effect contains that chip - soldered to an adapter board designed by MAS Effects, which is attached to my stripboard layout of the Madbean Headtrip 2 FV-1 project. It also contains the algorithm chip from that project featuring the presets designed by Brian of Madbean..

The 5 knobs are for dry and effect level, as well as three parameters that change with each effect preset. There's a lot to cover with this pedal, which is why my video is about 5 times longer than anything I've posted so far... if you make it through all 8 clips, I salute you!!!

Mode 1: Choir - similar to the EQD organizer, with the controls condensed to three knobs: octave down, octave up, and choir (which has a slight delay on the signal)

Mode 2: Filter+Octave - an envelope follower that is controlled by knobs 1&2, with an octave up and down dialed in by knob 3.

Mode 3: Detune+Tremolo - this is similar to the "detune" mode on the Whammy pedal. Its's a faux chorus of sorts. Knobs 2&3 control the speed and depth of the tremolo

Mode 4: Flangecho - an 850ms delay. Length and repeats are knobs 1&2, flanging level in the repeats is knob 3.

Mode 5: Echo+??? - a 975ms delay. Knobs 1&2 are the same as mode 4. Knob 3 controls a multi effect that goes from modulation to buzzy ring modulation to tremolo in the repeats.

Mode 6: Flangeverb - knob 1 is the reverb level, knob 2 is the low cut, knob three blends in a similar flange modulation as on mode 4.

Mode 7: Choirverb - a "shimmer" reverb with verb level on 1, low cut on 2, and octave up & down on knob 3.

Mode 8: 4th/5thverb - reverb level on knob 1, 4th down on knob 2, 5th up on knob 3. This doesn't show quite as much on the video but this is definitely the most organic/analog synth-sounding patch of these 8 (in my opinion)

Now the footswitches: the left switch is a "master on/off" that bypasses the entire circuit.

The right switch kills the input to the effect chip and allows the reverb/delay/choir to trail off naturally. HOWEVER - this will keep the dry blend knob in play and depending on where you have it set, this knob can boost the heck out of your signal. Which can be a good or bad thing... up to you.

Are any of these sounds "usable"? That's a matter of taste, of course, but at the very least, NONE of them are delicate. Thanks for reading this far...

-Chris, CDCE

 



11 comments:

  1. I saw Chris' demo when posted. Pretty crazy.

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  2. do you have the algorithms on file? Will you have a way to share the 8 algorithms?

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    1. Hey Michu! So the algorithms themselves are proprietary to the Madbean Headtrip 2 - and i had an extra EEPROM chip to use because I ruined an actual Headtrip PCB that I purchased from Madbean. I am super new to using the FV1- so I am trying to familiarize myself with all of the resources for getting algorithms and the hardware for burning them to chips. If you have Instagram, I post there quite a bit about what I am doing.

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  3. Thanks Chris/Anders. This looks interesting. I just purchased an FV-1 for the build. If anyone is interested, page 16 of the Madbean Headtrip 2 build doc has links to some free FV-1 algorithms. Also, for $10 you can purchase preloaded EEPROMs from PPCB with whichever of their algorithms you choose.

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    1. Should also note that preloaded custom EEPROMs from MAS effects can be ordered for $6.

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  4. Oh yeah, any chance of a daughter-board layout for the switchable EEPROMs as described on page 18 of the Madbean build doc?

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    1. appreciate the mention of the EEPROM retailers - I've got some chips on the way from both PedalPCB and MAS. Next step is to acquire a Windows laptop and EEPROM burner so that I can start making chips on my own. I did do a "quick and dirty" addition for a second EEPROM daughterboard. The layout is the most recent post on my instagram, which is just @capitalistdeathcult

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  5. As far as the adapter board for the FV-1 chip goes - as noted, the MAS Effect board is 9x14 - if PedalPCB ever restocks theirs, they are 5x14 (I think) and so to use those with this drawing, the jumpers on columns 13 and 17 would have to be moved out from underneath the adapter. Finally: PIN HEADERS - I made some out of 3 pin transistor sockets and wire but have since ordered proper ones - either way, all the adapter boards I've seen require pin headers to stand them up off the board - they do not have legs of their own!

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  6. This is so cool, I've built 3 pedal PCB octagons, if you ground pin 13 on the fv1 you can access the internal algorithms - totally worth adding an spst to ground. I believe that would work here too but correct me if I'm wrong. Also for what it's worth this is the eeprom burner I use on my windows machine https://www.ebay.co.uk/itm/CH341A-24-25-Series-EEPROM-Flash-BIOS-USB-Programmer-24C02-24C08-24C16-/132585231104?mkcid=16&mkevt=1&_trksid=p4429486.m46890.l6249&mkrid=710-127635-2958-0 and iirc maseffects has a guide on doing this on a Mac too if that's helpful for anyone, along with his huge collection of fv1 algorithms. Hopefully this inspires people to learn spincad and make some new cool patches I can steal 😁 thanks for sharing this

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  7. FYI, PedalPCB sells pre-soldered FV-1's if anyone is looking to try this and doesn't trust their soldering skills with SMD.

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  8. it looks like the pedalpcb FV-1 adapter boards are back in stock - also, Dirt Monger Instruments and I put together a design for something similar (it is two columns narrower than the MAS board) and uploaded it to Osh Park's site - their fabrication fee is $4.90 for 3 boards.

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