Tape Machine Multi Head Delay with video demo

[cooder]

This is based on the pedalpcb.com Hydra schematic with some modifications.

Demo here (dry clean sound reference at 1:07 in video), no other fx used.

http://www.youtube.com/watch?v=RKZUkGLsos0



I built the Hydra and I think it's great already stock, however I wanted to include the mod to disconnect leg 3 of MIX pot so that the dry signal is always present (Mode switch lower position) and back to stock(MODE switch up, this reduces dry signal especially on high MIX settings for atmospheric stuff etc).
This way I have both mod and stock options to be available on a switch for maximum flexibility.

Other changes and mods: I designed a new board for it and also included film capacitors where possible rather than MLCC caps as in ppcb version.
Lastly, onboard relay bypass added.



5 pots, 5 toggle switches, 125B, what could possibly go wrong... 



Robert from pedalpcb.com has done a fab job designing the schematic and programming the eeprom, thanks heaps!
It is from my personal point of view the best FV-1 project out there, for my personal taste.

Super flexible delay that has so many facets in sounds depending on what play heads are selected and what interaction happens between the SPEED, SWELL and AGE.
I love also how it captures the sound and quirkiness of the original tape delays, like increasing the SPEED shortens the delay time, dialing AGE to CW takes off high end that makes the repeats sit neatly under the guitar tone etc. Very cool feel in it and the sounds are great IMO. So many possible settings with different play heads selected and feeding into each other, very cool.







Circuit board is designed using DIPtrace, fabbed by JLCpcb. 125B enclosure powder coated white with Tayda UV print.
In the print design I wanted to capture the looks and feel of the TEAC reel to reel that I had many moons ago. The dials have the green/yellow/red colour staggering echoing the look of the UV meters (see what I did there....), the knobs have a similar look with the silver cap.
I think I had the TEAC A 3300 model, which is sold, doh...

This is my entry for the Madbean BOTY 2021, check it out here, join the fun and post your treasures as well. The more the merrier!
Check it out:
https://www.madbeanpedals.com/forum/index.php?topic=33264.0

Have a great New Years everyone stay safe and happy!

[pickdropper]

That is fantastic, top to bottom.  Great work.

[Bio77]

That's fantastic!   

Did you use the existing eprom or did you program a new one?

[jimilee]

Man o man, very nice.


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[cooder]

Thanks guys!

Did you use the existing eprom or did you program a new one?

I used the eeprom that came with the original Hydra board that I built first.

[gordo]

Holy crap.  I've been digging a similar deal based on the Daisy platform but this's off the charts!  I really gotta jump on the Tayda enclosure bandwagon.

[diablochris6]

That looks super sharp! Great enclosure design.

[cooder]

Thanks agin for kind words and interest, guys!

PS: post # 3000 wooheee....

[Bio77]

Hey Cooder, looks like you might need to debug    I noticed this morning when I was deciding on my BOTY votes.

[jimilee]

Where he's from, they don't need solder!!!


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[Bio77]

Where he's from, they don't need solder!!!


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I was referring to the actual bug on the relay 

[jimilee]

Where he's from, they don't need solder!!!


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I was referring to the actual bug on the relay 

Holy, whaaaattt? Get it outta offa that!


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[Bret608]

Well, at least it wasn't a giant Weta walking around on his PCB! Those things could probably eat the damn relay... 

[cooder]

Haha, I was wondering if someone would notice the critter on relay, well done Bio77!

Well, at least it wasn't a giant Weta walking around on his PCB! Those things could probably eat the damn relay... 

Yes the giant Weta looks pretty fierce and impressive and it would not have fitted into a 125B...



Pretty rare though and just as harmless. First time I saw one it was sitting motionless on a wall in a country pub surrounded by native bush. I thought it was a well made novelty gimmick plastic prop. Then it started to move after awhile much to the cheers of the pub patrons. Good entertainment.

And as for solder, I do just tack solder one leg of pots and switches with a small amount before I mount it in enclosure, tighten pots, then reflow the tacked leg which takes physical stress of it, then solder all other pots and switch lugs while already mounted. This way I feel there's the least amount of physical stress on pcb and lugs while still makes mounting easy enough.

[Aentons]