"Little Angel" - Super Simple PT2399 Mini Chorus

[frequencycentral]

[Govmnt_Lacky]

Hi

I m at work too(but in Central Europe). I just "open with" PAINT , did a "resize" to 50%.

I printed out and mesured,seems to be ok with 2.54 mm distance from hole to hole.

Regards Jean-Marie

Jean-Marie,

Thanks. I took your advice and used Paint. I resized to about 47% and it works great.

[Govmnt_Lacky]

I appreciate everyones help and I can't wait to get started on this little beauty. I have one more question:

Are there any FINAL decisions on the size of the Speed and Depth pots? I have read through the thread but I still do not see any definitive values yet.

[frequencycentral]

AFAIC it's 100k lin for Speed and 470k lin for Depth. That's how I liked it. Purrrrrrrr......

[Pigyboy]

Hi Rick,
How about running this at 12-18v for more headroom like the Analogman Chorus?

[markeebee]

Sorry, Rick is unable to answer. He's too busy scratching the furniture and licking his bum.

[Pigyboy]

Sorry, Rick is unable to answer. He's too busy scratching the furniture and licking his bum.

Dude, that is funny.

[anchovie]

Hi Rick,
How about running this at 12-18v for more headroom like the Analogman Chorus?

It won't give you any more headroom in the PT2399 as that's running off regulated 5V regardless.

[Pigyboy]

Hi Rick,
How about running this at 12-18v for more headroom like the Analogman Chorus?

It won't give you any more headroom in the PT2399 as that's running off regulated 5V regardless.

Hmm,  That is what I was afraid of. Can anyone who has built this give it a go really loud though a bass set up and report if it loses much in the low end.

[culturejam]

Can anyone who has built this give it a go really loud though a bass set up and report if it loses much in the low end.

Someone earlier in the thread used it with bass and commented on the low end response. Start reading on page 4/5 and you should eventually find it.

[Earthscum]

Aye. I've used it at 2 shows. For bass, you want to increase the delay a little bit for sure. I like the 5k pot, but already had the 10k installed.

For bass, once you find that perfect setting for you, you go from flat to gigantic godly overtones!

I used a TL072, hence the 100k pot in place of the 470k. I haven't un-ductaped my pedal to pop in an NE yet, so can't report on that. I rode my bike to the store to buy parts, came home and had it boxed and working and ready in 5 hours, with only an hour to spare before we had to be at the bar. Used it in an outdoor setting at the last one, and it is awesome. If you are outdoors, you can increase the depth a bit more without busting through over the top of the guitars.

And, lastly... absolutely no bass cut! I breadboarded mine with .022's in the audio paths, but I built it with all stock parts plus my mods to box up. I have a "super-fat" DS-1 that is basically my big OD. It increases the bass without destroying too much of the punch, still has the DS-1 grit, but bigger. This goes in front of my LA, and I only get the most minor bass cut out of it, which actually just seems to add to the overall tonal qualities.

Of all the things I tried, the ONLY one necessary for bass is the delay mod. Just a 5k pot. I wired mine so I could (next build) use the stock jumper pads from the layout. I just used a DIP strip on this one, but kept mods simple to work with the stock PCB.

[Pigyboy]

Thanks for the info Earthscum. I am gonna make some boards today and give it a go. This one is going to friend who is playing to 1000-5000 people a night so we will how the Angel does on a big stage. I have a good feeling about it.
Thanks again and a big thanks to Rick
I will report back soon but I still need to order parts

[Valoosj]

.....and the PCB apparently will fit in a 1590A! This might well be my excuse to try my hand at a 1590A build. solderman? danielzink? valoosj?

Seems I noticed this a bit late, but I might still make a layout, once the dust settles, as Dan said.

My first test will be to add a variable delay time control, a switch to go from 50/50 to "wetter" mix, and a feedback adjust switch. I doubt all that will fit in a 1590a, but you guys who work with those often surprise me.

I think we even surprise ourselves at times, when finally cramming something in a very tight enclosure.

Oh btw Rick, the flanger pcb will probably be made in the following weeks, since the workload for my studies will not be so huge in the following 3 weeks, so I might be able to make some pedals as well! But first I need to make some layouts and etch the suckers.

[p_wats]

Hmm, I also used a TL072 in my perf attempt without changing any other components. Could that be contributing to my lack of effect?

[Govmnt_Lacky]

Sounds like resolution is needed on the great Little Angel Op amp/potentiometer debate....

Will it be the TL072 with a 100K or.... the 5532 with the 470/500K?

The debate rages on...

[earthtonesaudio]

I don't see any reason to prefer the NE5532 in this circuit, other than the fact that it's already been verified.  However, if you do want to swap op-amps, the input resistance of the NE5532 is so low that a TL072 is not really a direct replacement.  You'll need to reduce the gain of the audio part and mess with the impedances in the LFO part to make the performance the same with a TL072.

[waltk]

Here's my "Little Blue Angel".  Worked the first time (with no debugging).  No parts substitutions.  Sounds great.
Thanks Rick!

[frequencycentral]

^^^^  

Hey that's the 1590A layout! You gonna squeeze it in?  

Of course we want photos and soundclips.......

[waltk]

Hey that's the 1590A layout! You gonna squeeze it in?

Don't have a 1590A box at the moment, but I do have another smallish box that should be a nice snug fit.  Pictures to follow later...

Rick - I etched some extra boards.  PM me with your mailing address if you want one.

[culturejam]

Sounds like resolution is needed on the great Little Angel Op amp/potentiometer debate....

Will it be the TL072 with a 100K or.... the 5532 with the 470/500K?

I've tried different op amps, and it does change the shape of the waveform slightly from chip to chip. So it will be a personal choice, I think.

Haven't tried the 100K pot.

Here's my "Little Blue Angel".  Worked the first time (with no debugging).  No parts substitutions.

Nice looking work, Walt!