"Little Angel" - Super Simple PT2399 Mini Chorus

[egasimus]

I'm so looking forward to that. The Little Angel is on my project list. Also on my layout making list though, since you'll probably want to keep it simple, and I want the mods ITT

[Perrow]

... and love voltage caps ...

Where do you buy those 

[egasimus]

(originally posted this in the Echo Base topic... silly me)
So I made a new layout for the Little Angel. It includes the dry/wet mod and the potentiometer on pin 6 mod. It should theoretically fit into a 1590a, too, although I haven't tried it - I can't source a 1590a box, and I don't have much time or money on my hands for the time being, either. But I think I'll find a couple of minutes to prepare and post the layout, if you're interested. This week, that is.

[deadastronaut]

of course!..nice one!....

[frequencycentral]

^^^

Well I was gonna save this as a surprise for LA's 1st birthday in August, but........




I wanted to keep it 1590A-able, but also add good things like the Pin 6 Fix and a seperate vref for the audio path. Here's the lowdown:

• Pin 6 Fix: D1/C16/Q2/R21/R22
  I did add a little Pin 6 Fix subcircuit to a PT2399 that I know won't work without. It still has issues, but I think raising R22 to 100R and C16 to 47uF will sort it
• Audio vref: R23/R24/C17 - suggested by merlinb as a way to reduce noise dumped into the older version's 5v vref supply by the PT2399
• C4 changed to 3.3nF - might be a bit darker but will be less hissy

 
As it's planned to be 1590A-able, hopefully all the electro caps should be able to be bend over 90⁰ to lie flat against the PCB. C16 might be the trickiest.

I PM'ed this layout last week to a couple of people who expressed interest in verifying it, so you never know, it could be verified within a day or so. The layout does need a little tidy up, as I notice the pad sizes are not all the same size.

[deadastronaut]

whhhooohooo...happy early birthday LA....

nice one rick..

[jvanoort]

Here is a little demo of my pedal. I added a 0.1uf cap across the 47uf one (in parallel) to get rid of some excess hiss.

Never mind the playing, just demoing the pedal 

<a href="http://www.youtube.com/watch?v=k1I-4w2JeoM" target="_blank">http://www.youtube.com/watch?v=k1I-4w2JeoM</a>

[deadastronaut]

@jvanoorrt:

nice. its great to see and hear this....thanks!..

i didnt hear any hiss on ricks original recording though?....hmmm..

[jvanoort]

Well, I did have some hiss. I also placed the additional cap across the 47uf one and after the recording also replaced the 1nf cap that connects leg 15 and 16 of the pt2399 with a 3.3nf cap. Makes the sound a tad darker, more in line with the dry signal, and removes the leftover hiss.

Very satisfied with this pedal.  

[deadastronaut]

Very satisfied with this pedal.  

you should be, sounds great!...i was waiting for the rat to go on with it!...mild overdrive type..sort of alex lifeson style.

[jvanoort]

Ah, I might do that in another demo, but I prefer chorus in an otherwise clean signal :-)

[WiLL_GS]

Hello guys! I'm from Brazil, and it's my first time here. I found this topic and I liked a lot. Than, I decided to make a Little Angel. I've got the components and I build it, but didin't worked. I plugged my guitar, and befote I turn on the Little Angel, the sound's guitar is normal, but when I turn on, I don't hear any noise more. I've verificad, there is no point of short circuit. This is the model that I follow:  http://imageshack.us/photo/my-images/39/111xl.gif/. I think I made a mistake somewhere, but someone but someone has already built this circuit and it worked correctly?? One more doubt, I just find this layout: http://imageshack.us/photo/my-images/4/layout1111.jpg/ . I tried to print several times, but the size was not the same as the circuit, so I did another by following links from this, only then could the actual size for the components. At least that part I know is right because I checked several times. I'd like to know how you get to print the same size as real. If I do not think the problem the way I did, I do it again with the original layout. Later I'll post some pictures of this project, other guitar pedal and also my amp, I did it by myself, all are very simple but work fine. Please help me! See you later, thanks a lot!!!

[Govmnt_Lacky]

Hello guys! I'm from Brazil, and it's my first time here. I found this topic and I liked a lot. Than, I decided to make a Little Angel. I've got the components and I build it, but didin't worked. I plugged my guitar, and befote I turn on the Little Angel, the sound's guitar is normal, but when I turn on, I don't hear any noise more. I've verificad, there is no point of short circuit. This is the model that I follow:  http://imageshack.us/photo/my-images/39/111xl.gif/. I think I made a mistake somewhere, but someone but someone has already built this circuit and it worked correctly?? One more doubt, I just find this layout: http://imageshack.us/photo/my-images/4/layout1111.jpg/ . I tried to print several times, but the size was not the same as the circuit, so I did another by following links from this, only then could the actual size for the components. At least that part I know is right because I checked several times. I'd like to know how you get to print the same size as real. If I do not think the problem the way I did, I do it again with the original layout. Later I'll post some pictures of this project, other guitar pedal and also my amp, I did it by myself, all are very simple but work fine. Please help me! See you later, thanks a lot!!!

Try here and then repost:

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

Good Luck 

[WiLL_GS]

I'm back! I found the problem, there were some poins of short circuit. I turned on and worked. But, I think that the sound wasn't good as a delay. Is someone has the same pedal build?? I 'd like to hear the sound, and compare whith the my. I 'll poste the sound of my, then you listen and tell me to know what you think of this. Here the video of my amp: http://www.youtube.com/watch?v=Y_j7QtAaLX4
I connect my guitar on this amp, using other pedal as a preamplifier(that has a fuzzy efect too), and I get a good result. Thanks!!  

    

[WiLL_GS]

I'm back again!! Today I recorded the sound of the Little Angel. I don't know if the sound is normal, I think that there is something wrong. This is the link of the sound of the Little Angel(only this) : http://www.4shared.com/audio/F5Pk6aIe/4_online.html . There is more one: http://www.4shared.com/audio/K4kVwhRR/sound2.html. Now I mixed the sound of my fuzzy and the ange: http://www.4shared.com/audio/lEgE96wL/fearfuzzydelay.html. PS: I don't play guitar very well, nay, I'm very bad Oo. Now some pictures of them(I put them in a pack .rar to facilitate) : http://www.4shared.com/file/E303rpDQ/Pictures.html . All files don't have any virus!! Please tell me what you think about the sound, and the pictures to =]. Bye.   

[Pigyboy]

Verified!

Not too hissy and works with all the PT2399's I have here even with R22<100 ohms.

I used a 2N5087 instead of a 2N3906 and two tiny 4.7uf in parallel for C16. Also went with the film 180nf caps as all the .1's I have are too big or ceramics.  I socketed R22 and using a 51 ohm resistors slows down the delay time a bit more. I think I will try a 100KC (as per Slade) for the speed pot to see what if I can spread the range adjustment out.

Thanks Rick!

Cheers,
Chris

[frequencycentral]

^^^

Nice to see it verified so quick, thanks Chris. 

[bigmufffuzzwizz]

Just finished my LA the other day and I'm pretty satified with it. I'm able to get lots of different cools sounds from it. I wanna give your birthday edition a go since I like this last one so much. And great job on making it super simple! Are there any other mods I can try besides the adjustable delay time and wet/dry pot? 

[deadastronaut]

could this still be a delay too!?..

[Scruffie]

So is there an updated schematic with these fixes...?

If so I might do an Onboard Pot 1590B with room for battery PCB...