BAJA Wet Cat analog delay (mini version)

Dirk_Hendrik · Post by **Dirk_Hendrik** » 06 Feb 2009, 19:13

Cool Steve!
It might just happen to be te case that when I heat up that etching tank tomorrow, which I need to do anyway something might hike along.

in a 3205 version though. The 3005's are too hard to come by from a (longer term) reliable (read: non-Chinese ) source. The fact that there's plenty to get from the bay and Steve Daniels is not able to supply should say enough.

sfx · Post by **sfx** » 06 Feb 2009, 19:29

Thanks for putting this together, looks great.

FWIW, I printed the mini layout out on paper last night and it looks like it will easily fit horizontally in a 1590BB sized box if you use top mount jacks and 9v adapter.

lautmaschine · Post by **lautmaschine** » 13 Feb 2009, 05:34

Very cool.

I've ordered my parts and will mount into a 125B as Soulsonic suggests. By the way, can you share the DM-2 service manual? Can't seem to find that anywhere...

cpm · Post by **cpm** » 13 Feb 2009, 07:43

very nice!
did you post a schematic too?

bajaman · Post by **bajaman** » 13 Feb 2009, 09:53

did you post a schematic too?

yes - check the aqua puss thread mentioned on the first post in this thread - seek and ye shall find
bajaman

KindaFuzzy · Post by **KindaFuzzy** » 14 Feb 2009, 04:33

Just built the MN3005 version, and it works great, and sounds killer even though it's not calibrated yet. Now I need to calibrate it, so I checked the DM-2 manual posted in the other thread and sort of understand where and how to measure the clock leakage and the clock frequency, but couldn't figure out where "pcb terminal 7" was to check the bbd bias. I have an oscilloscope, but I don't have a proper function generator, so I built the improved quick and dirty sinusoidal test oscillator found on the "other" forum (https://www.diystompboxes.com/smfforum/ ... pic=72786. link up at the top) and am ready to get this all set up, but just need a little more detail on the whole calibration procedure if someone wouldn't mind dumbing it down a little. This is kind of the first time I've actually used a scope.

This is probably the tightest layout I've ever built (kudos to Baja), so stock up on nice small caps or you'll have a tough time squeezing them in. Oh, and the unlabeled resistor on the layout up beside the 22K bias trimmer is 10K.

bajaman · Post by **bajaman** » 15 Feb 2009, 09:18

but couldn't figure out where "pcb terminal 7" was to check the bbd bias.

Sorry

- I erased it when I "altered the BOSS schem" it is the connection to the top of the delay and feedback pots (pins 3 on the diagram).
More build pictures without the shaky hands just posted
members/bajaman/Baja/Baja%20Wet%20Cat%20mini%20version/
By the way - I tried using it at practice last Saturday afternoon - the other guys loved it and I was very pleased with that lovely warm muffled delay that does not get in the way of my playing like most digital ice pick delays.
And - yes - I have built a BOSS DM-2 clone a couple of years ago, using a PT 2399 and similar filtering, companding, etc., - don't know what it is but the sound is not as pleasing - as Soulsonic has said in another thread - it is a neutral sound as compared to the fruity sound of the MN3005 based delay.

KindaFuzzy · Post by **KindaFuzzy** » 15 Feb 2009, 20:21

Just finished everything and figured out how to calibrate. Here's some pics, hope this link works, http://www.flickr.com/photos/35422385@N ... 836565400/.

This was my first time etching an enclosure, they weren't fooling when they said to sand the surface as flat as possible, I had a lot of pitting because I didn't.

I had to use a 1590N1 enclosure because I used sockets for the chips and big fat caps, but everything fit in nicely.

Thanks again Baja.

borislavgajic · Post by **borislavgajic** » 19 Feb 2009, 14:55

dear mister Steve......great project..can't wait to get one of those mn3005,and build this...................

DeluxePussy).......and if answer is YES,how to do it.....just erase mn3101,and find bigger box?

thank you

boris

bajaman · Post by **bajaman** » 19 Feb 2009, 18:47

Anything is possible

- sorry no time at present to redesign this project.
bajaman

puppiesonacid · Post by **puppiesonacid** » 19 Feb 2009, 21:14

baja,

would we be able to get double time if we stacked the BBD's as in the memory man and dirk's AD-9 project?

puppiesonacid

bajaman · Post by **bajaman** » 19 Feb 2009, 22:25

baja,

would we be able to get double time if we stacked the BBD's as in the memory man and dirk's AD-9 project?

Not sure - I will have to check Dirk's project - in the meantime can anyone chime in with a definitive answer?
cheers
bajaman

Igloo · Post by **Igloo** » 22 Feb 2009, 08:51

Hi Bajaman,

Firstly let me sat a hearty 'thank you' for the obvious efforts that you have expended here. Well done it looks excellent. I think the fact that there are two streams running concurrently has perhaps taken a little attention away from this great project.

bajaman wrote: I am going to redesign this project in the near future, because it is NOT easy fitting everything in a Hammond 1590B enclosure. The new design will be for the Hammond 1590BB and will most probably incorporate board mounted sockets and footswitch etc., similar to my Baja Real Tube Overdrive design perhaps.

If you do have the time to re-design this, I would be first inline to build it especially if you have the Cool Audio V3205 and the more relaxed fit for a larger enclosure in mind.
I have a stash of these already. The MN3005 no doubt is sweet and the premier choice but I don't want to buy things in $US at the moment and never want to pay >$20 for any single chip. Too many variables are possible.
I see some describing the V3205 as 'hotter' and with more of a noisier specs but most analog delays' filtering is set with the original Panasonic parts in mind so I'm thinking a little experimentation is in order. I'll have a look at the BYOC delay and compare their approach.

So once again wonderful, excellent and top work.

Igloo.

jazzmaster · Post by **jazzmaster** » 22 Feb 2009, 23:05

whee, thanks baja!!!

Very nice Project, thanks for all the hard work, but again the drillholes are to big for my taste, i drill 0.5mm for parts.
so i had to fiddle around in psd, but its okay

Tomorrow i will try out my new diy etch machine with that 3205 layout

V3205 should work too right? getting a bit confused by different statements out in the web,
when it comes to converting delays. like the post from igloo right above this one, does he speaks only about dimension or about pins ?
ppl say you need to flip pins, but when i look at the datasheets its the same supply voltage 4-9V.
ive attached the 2 pinouts as screenshots from the pdf files, confused wondering....

also i would love to see cascade 2 bbd chips for longer delays.
maybe like on the memory man here with an addon board by using the 4 unused pins in the socket.
im gonna try to figure out how to cascade those chips.

osa · Post by **osa** » 23 Feb 2009, 00:22

One easy way to cascade 3205's:
http://www.generalguitargadgets.com/dia ... ematic.pdf
Schematic shows 3208's. Works OK w/3205's.

puppiesonacid · Post by **puppiesonacid** » 23 Feb 2009, 02:42

Dirk did it this way:

sfx · Post by **sfx** » 02 Mar 2009, 01:12

Just a quick heads up for anyone attempting this build. The orientation of the Q4 transistor transistor in Bajaman's layout is reversed, the flat side should be facing the other way. The pins are labelled correctly though.

And I recommend using 16v/25v electrolytics; its a really tight layout, especially around the trimpots.

sfx · Post by **sfx** » 02 Mar 2009, 04:42

...and D1 and D2 for the delay pot on the overlay need to be switched around if I'm reading the schematic correctly.

KindaFuzzy · Post by **KindaFuzzy** » 02 Mar 2009, 12:17

I'll second that the EBC markings for the transistors are cool, so follow those, and if you'd like the delay pot to have longer delay times when turned clockwise leave as is.

I think I saw a DM-2 video that showed the delay pot working opposite to that, so that must be what's on the schematic.

sfx · Post by **sfx** » 04 Mar 2009, 23:19

Well, I finished putting together my build in a 1590NS enclosure; it sounds simply awesome. I just need to add a battery snap and put together some graphics for the box.

Thanks to Bajaman for the layout and to KindaFuzzy for help on the calibration.