Author Topic: "Little Angel" - Super Simple PT2399 Mini Chorus  (Read 499175 times)

Barcode80

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #760 on: January 06, 2012, 12:27:20 AM »
I've read from previous pages and I found to avoid the lockup from PT2399 is by substituting the value of resistor R1, capacitor C1 and C3 with the value that I mentioned above. Is there another trick that I missed? please let me know ....  ???

here:

http://www.diystompboxes.com/smfforum/index.php?topic=86297.msg774512#msg774512

cobexonly

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #761 on: January 06, 2012, 11:40:30 AM »
Don't know if anyone else has mentioned this, but if you are getting intermittent operation out of your LA, check what your power is reading. I found out the hard way on a used pedal board that someone had tried the 100r + huge cap trick for a noisy cheap wall wart that ended up with 8.1 vdc with only four pedals hooked up. At that voltage level both my LA and Echobase lfo's quit. Worked just fine when the One Spot powering the internal power strip did not get loaded down by the R/cap mentioned above. It went from 8.1 vdc to 9.54 vdc just eliminating that cludge. This worked both for the original with the pin 6 fix daughter board, and the birthday edition I built just to have everything on one board.

nice info bro...  I will measure voltage reading off my Power supply, and maybe I'll try to use battery first. Thanks ;)


I've read from previous pages and I found to avoid the lockup from PT2399 is by substituting the value of resistor R1, capacitor C1 and C3 with the value that I mentioned above. Is there another trick that I missed? please let me know ....  ???

here:

http://www.diystompboxes.com/smfforum/index.php?topic=86297.msg774512#msg774512

OMG  :o. how could I miss something as important as this. thanks for telling me, maybe I'll try advice from bhill first, if not successful I will try this one. thank you  :icon_wink:

mr_deadmaxxx

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #762 on: January 06, 2012, 08:55:15 PM »
how is this as compared to the one-chip chorus?
http://www.diystompboxes.com/smfforum/index.php?topic=92872.0

mr_deadmaxxx

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #763 on: January 13, 2012, 04:00:33 AM »
is the birthday edition verified and working?

bhill

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #764 on: January 13, 2012, 08:47:12 AM »
Many times.

juanjuin

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #765 on: January 25, 2012, 12:22:28 PM »
excuse me
i'm a new member here
sorry for out of topic here
sorry for my bad english

i want to ask this, please
Another oops!!!!! some tipping error labeled on C6 is 0.1uF the correction is in this layout:

Thanks Govmnt_Lacky for your observations!!! something else please!!!!!

i want to ask C12 and C14
in my country, Indonesia, i didn't find 0.1pf
is that right capasitor? i just found 1pf in electronic component store in my town,or i must make 10 of 1pf strung together a series
and is that right R1 is 100k?

sorry for my bad english
and sorry for out of topic
i was excited about 5 pot little chorus

thankyou

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #766 on: January 25, 2012, 08:19:43 PM »
C12 and C14 are 0.1uF (otherwise known as 100nF).

R1 is 100R (otherwise known as 100 ohm). Not 100K!

juanjuin

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #767 on: January 25, 2012, 09:16:56 PM »
C12 and C14 are 0.1uF (otherwise known as 100nF).

R1 is 100R (otherwise known as 100 ohm). Not 100K!

woo, thankyou sir :)

mr_deadmaxxx

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #768 on: January 28, 2012, 10:28:24 AM »
@frequency central

I built your LA Birthday Edition and I cant tell why there is a very huge amount of volume loss/drop. Around 10 to 20% only of the input signal comes out at the output. Is this normal?
BTW, I used an Ipod for the input as I dont have an electrical guitar on hand. Did that affect the volume loss?

Thanks.

garcho

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #769 on: January 28, 2012, 08:12:36 PM »
Quote
Around 10 to 20% only of the input signal comes out at the output. Is this normal?

No.

Quote
I used an Ipod for the input as I dont have an electrical guitar on hand. Did that affect the volume loss?

Try with a guitar before troubleshooting. Pickups are much different than what comes out of your iPod's headphone jack.
"...and weird on top!"

Willybomb

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #770 on: February 01, 2012, 06:31:11 PM »
Here's mine.  It's actually my first pedal build - thanks to Haberdasher on the madbean forums for the PCB.

Gutshot (yes, it's messy):



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acepepper

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #771 on: February 08, 2012, 09:14:42 PM »
Sorry to be late to the party on this one, I don't get over here very often. Is anyone still making PCBs for the Little Angel?

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #772 on: February 09, 2012, 02:33:59 AM »
Is anyone still making PCBs for the Little Angel?

Yep!

mr_deadmaxxx

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #773 on: February 15, 2012, 07:32:55 AM »
@chris

did your original page 4 version work ok?..still waiting to build this... :)
The one from page 9 for the 1590A's definitely works with the pin 6 fix (like the one pictured above)  I am not sure if anyone got the BDay version to work totally right yet. Turns out the sound out of mine is really weak compared to the one above.

Same problem. Weak output signal.

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #774 on: February 15, 2012, 07:52:55 AM »
I've gotta build another one myself in a few weeks, we'll see how it turns out.

mr_deadmaxxx

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #775 on: February 15, 2012, 08:13:09 AM »
I guess I'll just wait then.. ;D

bacanador

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #776 on: February 15, 2012, 06:47:04 PM »
I am about to build this one

I noticed one thing, that there is no capacitor to ground between the two resistors that go to the opamp on the pt2399, most circuits with the pt2399 have it, so it seems this is only a 1st order low pass filter




Which is equivalent to this:




So maybe there is an opportunity to eliminate a couple of resistors, (1 at the input and 1 at the output), since it seems to work fine with a 1st order filter

I simulated this in ltspice, to make sure and I got the same freq response


bacanador

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #777 on: February 16, 2012, 10:18:39 AM »
So in other words, it would look like this



I put 33K, because it is a common on value, but 30K would be the right value to keep the frequency response exacly the same. I have not tried this, but seems like it makes sense?.

I hope it is OK to use Frecuency central's artwork, (partially), I'll take it down if it is a problem

garcho

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #778 on: February 26, 2012, 10:18:34 PM »
I moved this to Little Angel Space Madness Mod, sorry for the clutter!
« Last Edit: February 26, 2012, 11:20:58 PM by garcho »
"...and weird on top!"

deadastronaut

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #779 on: March 14, 2012, 06:21:21 AM »
i'm going to breadboard this today , as it seems the most logical thing to do...

is this the final schematic with the pin 6 fix?..

http://www.diystompboxes.com/smfforum/index.php?topic=86297.msg815570#msg815570

is this a working model?...even when unplugged and plugged back in...or is there still gremlins?...cheers guys. :)


edit: hmmmm i have sound but no lfo at all :'(......ive gone over it a few times?...i'll check it over again...i hope this schematic is the working one.. :P

« Last Edit: March 14, 2012, 11:18:58 AM by deadastronaut »
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