weiss

Re: GDIY passive 'Mojo' box
« Reply #20 on: October 30, 2020, 01:56:15 PM »
Interested! :)


ruffrecords

Re: GDIY passive 'Mojo' box
« Reply #21 on: October 30, 2020, 06:56:32 PM »
;D yup, I read you - but these are chinese volts, like used in auto hifi..  ;D
Ah, so, like peak music power is about one tenth of mean.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Ricardus

Re: GDIY passive 'Mojo' box
« Reply #22 on: October 31, 2020, 02:26:52 AM »
WANT
Audio mastering for hire..

pvision

Re: GDIY passive 'Mojo' box
« Reply #23 on: October 31, 2020, 11:28:51 AM »
I built a prototype of something similar a short while ago. Spent many happy hours listening to diodes...

The final results were really good but it needs a PCB to bring build time down to a reasonable level

https://www.bn1studio.co.uk/shop/compressors/stereo/grasshopper-valley-yellowhammer/

Nick Froome

ruffrecords

Re: GDIY passive 'Mojo' box
« Reply #24 on: October 31, 2020, 06:00:09 PM »
I built a prototype of something similar a short while ago. Spent many happy hours listening to diodes...

The final results were really good but it needs a PCB to bring build time down to a reasonable level

https://www.bn1studio.co.uk/shop/compressors/stereo/grasshopper-valley-yellowhammer/

Nick Froome

if you are happy to release the schematic then  I am happy to create a PCB.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Re: GDIY passive 'Mojo' box
« Reply #25 on: October 31, 2020, 06:02:43 PM »
I built a prototype of something similar a short while ago. Spent many happy hours listening to diodes...

The final results were really good but it needs a PCB to bring build time down to a reasonable level

https://www.bn1studio.co.uk/shop/compressors/stereo/grasshopper-valley-yellowhammer/

Nick Froome

It's looking good.

craigmorris74

Re: GDIY passive 'Mojo' box
« Reply #26 on: November 01, 2020, 01:01:39 AM »
I've ran diodes from a transformers primary to secondary and gotten some interesting results.

ToBSn

Re: GDIY passive 'Mojo' box
« Reply #27 on: November 01, 2020, 04:06:12 AM »
Here are my two cents...
I copied the "Mojo Maestro" with some small adjustments.
I added 2 rotary switches for a diode selection and a rotary switch for the Mojo mode which allows you to switch through different caps.



Found a nice solution to hook up different diodes:
http://diy-fever.com/misc/flexi-clip/
And a listening test to different types:
https://m.youtube.com/watch?v=bifKfe04TBc
« Last Edit: November 01, 2020, 06:05:35 PM by ToBSn »

ToBSn

Re: GDIY passive 'Mojo' box
« Reply #28 on: November 01, 2020, 05:19:51 PM »
Rough PCB sketch of the previously attached schematics.

Edit: fixed diode direction  ::)
« Last Edit: November 01, 2020, 06:08:35 PM by ToBSn »

gyraf

Re: GDIY passive 'Mojo' box
« Reply #29 on: November 02, 2020, 02:29:48 AM »
..for experimentation (and yes, this requires massive amounts of experimentation), it's probably easier just to solder directly to the switches?
..note to self: don't let Harman run your company..


ToBSn

Re: GDIY passive 'Mojo' box
« Reply #30 on: November 02, 2020, 05:20:12 AM »
..for experimentation (and yes, this requires massive amounts of experimentation), it's probably easier just to solder directly to the switches?

Yes, for sure. Breadboard and some cables are absolutely fine for beginning.
I only made the board because it was fast and to get a feeling for the size and layout.

Re: GDIY passive 'Mojo' box
« Reply #31 on: November 02, 2020, 12:23:08 PM »
Great idea, Ian!

As for the linear approach, I really like the DIYRE 15 IPS Tape Saturation Colour: Clipping germanium diodes and a low end roll-off/bump meant to mimic the sound of analog tape. I use it all the time... not sure it actually does sound like tape but I'm a sucker for germanium diode distortion...  ;D

As for transformer saturation, the Neve Silk stuff is amazing. There's an intersting analysis here: http://koo.corpus.cam.ac.uk/rnd-portico-schematic/

/Rasmus

Ricardus

Re: GDIY passive 'Mojo' box
« Reply #32 on: November 03, 2020, 12:26:29 AM »
Great idea, Ian!

As for the linear approach, I really like the DIYRE 15 IPS Tape Saturation Colour: Clipping germanium diodes and a low end roll-off/bump meant to mimic the sound of analog tape. I use it all the time... not sure it actually does sound like tape but I'm a sucker for germanium diode distortion...  ;D

 I really like the 15 IPS module myself. I think it's the most usable one. But I like the older one better than the latest newest design.
Audio mastering for hire..

Re: GDIY passive 'Mojo' box
« Reply #33 on: November 03, 2020, 04:08:48 AM »
I really like the 15 IPS module myself. I think it's the most usable one.

Agree.

Here's a demo of all the Colour modules from DIY RE:

https://www.youtube.com/watch?v=nbrqXS5VjTA&feature=emb_rel_end

Some are definitely more usable than others.

ToBSn

Re: GDIY passive 'Mojo' box
« Reply #34 on: November 03, 2020, 04:56:00 AM »
Agree.

Here's a demo of all the Colour modules from DIY RE:

https://www.youtube.com/watch?v=nbrqXS5VjTA&feature=emb_rel_end

Some are definitely more usable than others.

Indeed, the DIY RE stuff looking really good.
But in this case it’s not a passive circuit for passive box.

Ricardus

Re: GDIY passive 'Mojo' box
« Reply #35 on: November 03, 2020, 12:26:59 PM »
Indeed, the DIY RE stuff looking really good.
But in this case it’s not a passive circuit for passive box.

Peterson does actually do a version of Ethan Winer's open source Mojo circuit as well.

As someone pointed out. Modding that might be a good place to start.
Audio mastering for hire..

wlinart

Re: GDIY passive 'Mojo' box
« Reply #36 on: November 03, 2020, 02:03:38 PM »
Mammoth cave audio did some things like that. Here is the description, maybe there's some inspiration to get there: https://web.archive.org/web/20160219215310/http://mammothcaveaudio.com/passive-aggressive-series/

ruffrecords

Re: GDIY passive 'Mojo' box
« Reply #37 on: November 03, 2020, 06:02:46 PM »
Mammoth cave audio did some things like that. Here is the description, maybe there's some inspiration to get there: https://web.archive.org/web/20160219215310/http://mammothcaveaudio.com/passive-aggressive-series/

That one is an active box. I have built quite a few of these in the last decade. Basically one of my standard tube amps with input and output controls so you can set the amount of tube/transformer overdrive and then tame the output level.

I was hoping we could do a passive only device - saves loads of problems with power supplies and so on.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Ricardus

Re: GDIY passive 'Mojo' box
« Reply #38 on: November 03, 2020, 11:09:21 PM »
I was hoping we could do a passive only device - saves loads of problems with power supplies and so on.
Ian

 +1
Audio mastering for hire..

wlinart

Re: GDIY passive 'Mojo' box
« Reply #39 on: November 04, 2020, 02:18:40 AM »
That one is an active box. I have built quite a few of these in the last decade. Basically one of my standard tube amps with input and output controls so you can set the amount of tube/transformer overdrive and then tame the output level.

I was hoping we could do a passive only device - saves loads of problems with power supplies and so on.

Cheers

Ian

The device got a misleading name then  ;D I would prefer a passive device too, so i'll watch this thread with much interest


 

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