Author Topic: "Little Angel" - Super Simple PT2399 Mini Chorus  (Read 499196 times)

bluebunny

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #940 on: July 27, 2015, 03:18:41 AM »


Wow! 5 years old in a couple of weeks

Never mind "birthday edition", what about a "starting school" edition?  [emoji1]
Ohm's Law - much like Coles Law, but with less cabbage...

Perrow

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #941 on: August 04, 2015, 01:56:03 PM »
I didn't build the little one, I built the little big one :)





Only built one, yet.

Elijah-Baley

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #942 on: August 09, 2015, 05:40:24 AM »
Excuse me, Little Angel's experts.
I have a some problem with my Little Angel building. I used tagboard vero layout. I built it some months ago, and I had a little background noise when I play (not so loud but I can hear it :(), PT2399 tipical noise, I think. I tried 3 different IC. With 2 I got no changing, and the third didn't work. I tried with another 78L05, too.
Somebody tried to help me in this forum, but I got nothing, yet.  I checked the voltage, those are ok.
I test it out of the box, without footswitch nor led indicator and with a little bit diyng battery at the moment. After boxed and with a psu this circuit could be less noisy or not?
Seems to me some demo on youtube of this pedal play noiseless.
I really don't understand this.

Another thing. I tested the circuit after much time, and just now I notice, when I set speed and, even depth pot, to zero, a quickly detune. It is normal?

Thank you!
There is something even higher than the justice which you have been filled with. There is a human impulse known as mercy, a human act known as forgiveness.
Elijah Baley in Isaac Asimov's The Cave Of Steel

Cjuried

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #943 on: September 15, 2015, 02:49:08 PM »
I didn't build the little one, I built the little big one :)





Only built one, yet.
Nice job!
Chris Juried
Audio Engineering Society (AES) Member 
http://www.JuriedEngineering.com (Juried Engineering, LLC.)
http://www.TubeEquipment.com (Tube Equipment Corporation)
http://www.Historyofrecording.com (History of Recording)

Hemmel

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #944 on: September 15, 2015, 03:08:47 PM »
I didn't build the little one, I built the little big one :)



Only built one, yet.
Nice job!

^ Agreed!
Question to Perrow: Why is pin 4 on the PT2399 bent up that way? Couldn't it be inside the socket, since the trace on the PCB doesn't go anywhere?
B.

Perrow

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #945 on: September 15, 2015, 03:11:31 PM »
The trace on the posted pcb-layout doesn't go anywhere, on the etched board it goes to ground :)
My stompbox wiki -> http://rumbust.net

Keep this site live and ad free, donate a dollar or twenty (and add this link to your sig)

Hemmel

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #946 on: September 15, 2015, 03:13:51 PM »
Ah!
Got it.
Thanks!
B.

Perrow

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #947 on: September 15, 2015, 04:17:45 PM »
The pcb in the build also has a turkey in the upper right corner (almost shines through on the image next to the input jack) as this was a build for the thanksgiving day contest.

It's also worth noting that the labels for the pots are wrong, should've been the other way around  ::)
My stompbox wiki -> http://rumbust.net

Keep this site live and ad free, donate a dollar or twenty (and add this link to your sig)

bluebunny

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #948 on: September 16, 2015, 03:09:47 AM »
Why is pin 4 on the PT2399 bent up that way?

I thought it was peeing...   :icon_biggrin:
Ohm's Law - much like Coles Law, but with less cabbage...

Perrow

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #949 on: September 18, 2015, 05:02:48 PM »
I thought it was peeing...   :icon_biggrin:

Someone has suggested it was "giving the finger", it sure is a conversation starter :D
My stompbox wiki -> http://rumbust.net

Keep this site live and ad free, donate a dollar or twenty (and add this link to your sig)

GiovannyS10

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #950 on: September 18, 2015, 07:09:51 PM »
I built a little angel, is very nice, but i recommend you to put a volume pot, because this chorus have so much gain and is difficult to use with distortion or drive. I like drive + chorus. xD

I used this layout, worked right for me.



Good work for you!
That's all, Folks!

"Are you on drugs?"
-ARSE, Duck.

www.instagram.com/allecto

avandelay

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #951 on: June 12, 2016, 01:37:04 PM »
Just wanted to chime in and say that I just breadboarded a Little Angel, standard edition.  Works great on first breadboard and I'm getting it ready to solder it up.  Thanks Rick!

dabbler

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #952 on: June 15, 2016, 12:58:59 PM »
Over 5 years after the original design I have just, today, found the thread & have built the Little Angel (V2) on breadboard. The only change being the use of a 1K resistor on pin 6 of the PT2399. It sounds superb (particularly since it's on breadboard - no noise  8) . Unlike most like most of the people on here I'm no expert (though I have successfully built Reverb (Equinox II), Echo, Fuzz and Tremolo effects). Big thank you to Rick for this great design.

Edit: Just modified to include the pin 6 fix (so that I get 100 Ohm at pin 6 without potential for lock up) and it sounds even better! Also put a 'rate' LED  from Pin 7 of 5532 (yep, I've used opposite configuration of the dual op amp to many). Interestingly, a 3mm red LED added a bit of noise but a 3mm yellow LED is fine  ???
« Last Edit: June 17, 2016, 09:49:59 AM by dabbler »

maiko

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #953 on: June 15, 2016, 10:08:58 PM »
This is also my primary chorus.    but im wondering if i wish to increase rate and depth what mods should i first start with.   should i change the pots to smaller value?   

Mgt280y

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #954 on: June 18, 2016, 06:42:19 PM »
Does anyone have any prefab boards for either the little angel or birthday edition available at the moment?

bluebunny

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #955 on: June 20, 2016, 03:13:42 AM »
JMK has a board.  They're in Canada, so I assume the prices are CAD.  Works out at about 8 shipped back to the UK.  Delyk has a board too.  Texas this time: price is around the same.  And of course, closer to home, is Fuzz Dog with their "Cherub" take on the LA: about six quid delivered.
Ohm's Law - much like Coles Law, but with less cabbage...

Mgt280y

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #956 on: June 20, 2016, 04:35:25 AM »
Cool thanks for that how does the cherub compare, as fuzz dog are awesome to deal with really fast delivery and sweets :), but all the write ups on the LA both editions sound very promising

roseblood11

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #957 on: June 20, 2016, 05:40:37 AM »
Has anyone played the original version and the improved version by Jack Orman (with 6V regulator) side by side?

bluebunny

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #958 on: June 20, 2016, 05:57:32 AM »
Cool thanks for that how does the cherub compare, as fuzz dog are awesome to deal with really fast delivery and sweets :), but all the write ups on the LA both editions sound very promising

So far as I know, the Cherub is the LA (Birthday Edition), but with options for mods.  (Not to be confused with Sam's Cherub chorus, btw.)
Ohm's Law - much like Coles Law, but with less cabbage...

jfrabat

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #959 on: November 21, 2016, 09:06:04 PM »
Hey guys!  Newbe here reviving  VERY old thread!  Sorry about that, but I need a little help!

I am building my LA, and based mine on the PCB and diagrams below (as found in Page 34 of this thread).

Schematic for the Birthday Edition:






[/quote]

My first question is that it seems that C17 is 47 uF in the schematic, but the diagram has it listed as 10 uF.  I have 10 uF in mine (did not notice this until I was trouble shooting), but what should it be?  10 uF or 47 uF?  Or either one?

Now, back to trouble shooting!  Using my audio probe, I noticed that the signal is coming in strong at the input, and continues strong after C13 (0.1 uF in the schematic), but then becomes muted down after R16 (470K in the schematic). Is this normal?  It is even further muted by R15 (1M in the schematic).  This muted sound makes it all the way to the 2399 pins 14, 15 & 16...  actually, I can hear the muted sound all the way to the output.  I did not continue testing because my cell phone (my source for tones for trouble shooting) ran out of batteries, but I figured I had enough to start asking for help.  So, what do you guys suggest I look at first?  Do you need voltage readouts from the 2399 pins?
Newb without skills!  Have some patience!