Cherub - another PT2339 pseudo chorus and vibe

[deadastronaut]

i'm like a magpie...anything shiney i'm on it..

talking of which, my solar lights have a new life....sun!!!!!! Ahhhhhhhhhhhhh....at last...

grab a solar bug or 2 or 3 from the 99p shops...they're brilliant..

[GodSaveMetal]

Another case of mission creep:
I added a depth control last night. It is more useful than I thought it would be, and is a recommended addition. The 3 controls - rate depth and mix make for a rather versatile little circuit and the vibe effect (fully wet) is now quite useful right across the range of LFO speeds. I guess I better make a proper demo...

The schematic has been updated and the layout will need tweaking at some stage.

Please man make an update with that; I stay tuned!! it sounds great man!!

[pinkjimiphoton]

any lockup issues with this circuit?

i don't wanna deal with the same probs as the LA seems to have. thanks!

killer sounding pedal... just don't trust 2399s too much these days...

[samhay]

^Please man make an update with that; I stay tuned!! it sounds great man!!

I will update the layout to show how I modified it. it's not pretty, but works. If anyone wants the diylc file to do a better job, then let me know.

As far as latch-up goes. I haven't had a problem, but it could potentially be a problem if it is powered up at minimum depth - this is part oft the reason I initially went for a max depth effect.
If people have a problem with the chip latching, an anti latch up circuit can be easily added.

[GodSaveMetal]

^Please man make an update with that; I stay tuned!! it sounds great man!!

I will update the layout to show how I modified it. it's not pretty, but works. If anyone wants the diylc file to do a better job, then let me know.

As far as latch-up goes. I haven't had a problem, but it could potentially be a problem if it is powered up at minimum depth - this is part oft the reason I initially went for a max depth effect.
If people have a problem with the chip latching, an anti latch up circuit can be easily added.

OK I wana´!!!!!!!!!!! please post!

[samhay]

^OK I wana´!!!!!!!!!!! please post!
I've updated the layout to show how I added the depth pot.

Two points:
1. I would strongly suggest you breadboard this first. PT2399s seem to be rather variable beasts, so you may have to tweak a few component values to get it to work as well as it should.
2. I am working on a new layout, which should be a bit less of a kludge. See below.

[samhay]

Here is another layout. It is a tad smaller, and the mix pot is now not routed half way round the board.
However, It is not verified, and may well contain some errors around the top side of the PT2399. When I get some more time, I will go over it again, but in the mean time...

[samhay]

I've had another look over the Ver 2.1 layout above, and there are no obvious errors.
I'm not likely to build another one for a while, so if anyone tries it, please let me know.

[GodSaveMetal]

I've had another look over the Ver 2.1 layout above, and there are no obvious errors.
I'm not likely to build another one for a while, so if anyone tries it, please let me know.

I stay TUNED please let know how it be; thanks!!!

[Crontox102098]

Sounds better than my Behringer UC-200, i think 

[samhay]

^Sounds better than my Behringer UC-200, i think

I'm not sure that that is necessarily much of a compliment, but thanks. Have you built it?

[Ice-9]

That sounds great , I just got some PT2399's to play with so will have to give this a go on the breadboard. 

[samhay]

That reminds me - I really must do a proper demo.
The clip on the first page was recorded before I added the depth pot, which effectively was on max.
This was recorded (again, sorry for the cheap-and-cheerful quality) for the Dino's no-LFO chorus thread recently. In this case the depth was at min for most of it, but you get a little sense of what it can do towards the end.
https://dl.dropboxusercontent.com/u/11996927/cherub_v2_min_depth.mp3

[samhay]

That sounds great , I just got some PT2399's to play with so will have to give this a go on the breadboard. 

Glad you like it.

[Crontox102098]

^Sounds better than my Behringer UC-200, i think

I'm not sure that that is necessarily much of a compliment, but thanks. Have you built it?

Yep, in a breadboard... sounds great and is it absolutely noiseless.

[samhay]

^Yep, in a breadboard... sounds great and is it absolutely noiseless.

Excellent.

[GodSaveMetal]

^Yep, in a breadboard... sounds great and is it absolutely noiseless.

Excellent.

What lay is the verified??; you have photos?

[samhay]

The perf layout in the first post is verified.
The ver 2.1 layout (http://www.diystompboxes.com/smfforum/index.php?topic=106854.msg970043#msg970043) isn't verified (that I know of), but looks like it should work.

If anybody would like to do a better job, then I am quite happy or them to do so.

[bilo01]

Nice job Samhay!! I was just in the process of deciding what chorus to make. I had my orderlist for Tonepads Corrall chorus ready, but i think i'll change it to yours. Sounds great and looks less complex.
Question: has the pcb-layout in your first post been updated too?
I have no experience in making layouts but i'm working on that

[samhay]

The PCB layout doesn't need to be updated, as the only changes were a flying resistor and pot.
However, the ver 2.1 perf layout should work ok as a PCB transfer too. I can post a scaled version of the trace if you like.
With all things, I would suggest you give this a try on the breadboard first. I would imagine it is quite a different beast to the Tonepad chorus.