Author Topic: "Little Angel" - Super Simple PT2399 Mini Chorus  (Read 499529 times)

p_wats

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #160 on: August 23, 2010, 04:14:01 PM »
Hey guys, I tried a perf/p-to-p layout for this, but it's only my second time ever going from schematic to layout, so I screwed up somewhere and I get nothing but a faint hum. Can anyone see anything glaringly wrong at a glance?


culturejam

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #161 on: August 23, 2010, 06:12:35 PM »
Pins 3 and 4 should be grounded, not just connected to each other.

Pin 4 is the analog ground, and if it ain't grounded, you don't get sound.   :icon_mrgreen:

p_wats

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #162 on: August 23, 2010, 06:25:33 PM »
Pins 3 and 4 should be grounded, not just connected to each other.

Pin 4 is the analog ground, and if it ain't grounded, you don't get sound.   :icon_mrgreen:

Thanks for the catch. That's just a drawing error though, as I actually did ground pin 4 when I perfed it...so there's probably something else keeping it from working.

culturejam

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #163 on: August 23, 2010, 07:12:14 PM »
I think I see the problem.

The 470K resistor should connect directly to pin 6 of the op amp. You have it connected to pin 7.

JKowalski

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #164 on: August 23, 2010, 07:41:16 PM »
no wonder your etching technique is superb because you design them in illustrator which is vector based as opposed to photoshop pixel based..

Photoshop does vectors too! Even on my now-very-old photoshop 7 that can't install on windows 7.  :'(

frequencycentral

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"Little Angel" Mini Chorus 1590A Layout
« Reply #165 on: August 26, 2010, 03:05:35 AM »
.....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?

I don't wish top be a party pooper but...
I have to report that I do not believe this will fit into a 1590A.
The board is exactly as wide as the outer dimensions of the enclosure. While you could perhaps lean the board I do not believe you would have room for the footswitch and especially jacks with a leaning board.

I will say it will fit a 1290 very nicely however.

If someone can prove me wrong...(Daniel Z. ?) .. I will certainly tip my hat to you!  :icon_biggrin:

 :o Shock and disappointment! So I've shaved it down to fit. I believe a board 13 pads wide will fit in a 1590A. The only compromise it that the connection for Depth pot lug 3  has moved from the edge of the board to, err, elsewhere. If anyone wants to etch one for me.......... :)



Pigyboy

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #166 on: August 26, 2010, 03:50:38 AM »
Wow. Great work Rick.
 Has any one tried this with a bass yet?
 My friend Dan McNay is playing with Ronnie Montrose and The Frank Hannon Band and asked me yesterday of an interesting bass chorus. Any cap replacements to make it more bass friendly would be great.
 Rick, do you mind if I use the layout to make him one?  I will get pictures for you.
Thanks
And you'll have to admit, I'll be rich as shit
I'll just sit and grin, the money will roll right in....
                                                            - FANG

Pigyboy

Re: "Little Angel" Mini Chorus 1590A Layout
« Reply #167 on: August 26, 2010, 04:03:23 AM »

[/quote]
If anyone wants to etch one for me.......... :)
[/quote]

I can etch a few of these and send you one next week no problem.
And you'll have to admit, I'll be rich as shit
I'll just sit and grin, the money will roll right in....
                                                            - FANG

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #168 on: August 26, 2010, 04:03:54 AM »
Has any one tried this with a bass yet?

Earthscum has used it with bass and seems to like it!

Rick, do you mind if I use the layout to make him one?  I will get pictures for you.

That's what it's here for!

I can etch a few of these and send you one next week no problem.

 :icon_biggrin:

I just tweaked that layout slightly so C8, C9 and C10 can be bent over to lay flat if need be, it will show up in my post above when photobucket gets it's shit together to finally refresh.
« Last Edit: August 26, 2010, 04:07:54 AM by frequencycentral »

Govmnt_Lacky

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #169 on: August 26, 2010, 08:24:06 AM »
This may be a noob question but...

If I copy the layout from Frequency above, are there any special changes I need to make in order to "size it right?" Or, is it already properly sized to populate with components?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of ‘up to and including my life.’

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #170 on: August 26, 2010, 08:33:49 AM »
This may be a noob question but...

If I copy the layout from Frequency above, are there any special changes I need to make in order to "size it right?" Or, is it already properly sized to populate with components?

Scale the PnP to a .1 inch grid in photoshop. An ICs pin spacing will match the grid when correctly sized. Is that what you mean?

-------------------------------------------------------------------------------------------------------------------------------------------------------------------

I see my 'slightly tweaked' 1590A layout in my last post still hasn't refreshed in photoshop, so here's direct links in dropbox:

http://dl.dropbox.com/u/967492/LAC%201590A%20PCB.gif

http://dl.dropbox.com/u/967492/LAC%201590A%20PnP.gif

culturejam

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #171 on: August 26, 2010, 08:49:33 AM »
Here's a little layout note:

C11 is really close to D1 (which must be mounted vertically) and R19. So it either needs to be a smallish cap, or leave some slack on the leads so you can bend it over and lay it flat over R19.

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #172 on: August 26, 2010, 08:54:15 AM »
Yeah, there's not much room there (sorry!), I didn't want to make the layout bigger just for the sake of one pesky diode. I figured people might instead mount the diode on the copper side or even directly to the DC socket. This would also allow C11 to be bent over on it's side for extra 1590A squeezage. That's what I'll gonna do.

culturejam

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #173 on: August 26, 2010, 09:10:29 AM »
By the way, Rick, I've played around with several values of resistors where the two 220Ks are located. I ran out of 220K, so I took the opportunity to socket those spots and test it out. I can say for sure that any value between 150K and 275K will work in either or both of those positions. Waveform and min/max speed will change, of course, but several alternative values will work in a pinch.

Also, different op amps make a subtle, but noticeable, change in the LFO waveform shape.

Govmnt_Lacky

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #174 on: August 26, 2010, 09:28:46 AM »

Scale the PnP to a .1 inch grid in photoshop. An ICs pin spacing will match the grid when correctly sized. Is that what you mean?


I do not have Photoshop. Any other way to ensure it prints out to correct size?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of ‘up to and including my life.’

nordine

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #175 on: August 26, 2010, 10:08:00 AM »

Scale the PnP to a .1 inch grid in photoshop. An ICs pin spacing will match the grid when correctly sized. Is that what you mean?


I do not have Photoshop. Any other way to ensure it prints out to correct size?

the hard way: trial and error  ;D

i print three tries with marginally different sizes, then pick an IC socket and see on which one it fits better

frequencycentral

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Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #176 on: August 26, 2010, 10:14:49 AM »

Scale the PnP to a .1 inch grid in photoshop. An ICs pin spacing will match the grid when correctly sized. Is that what you mean?


I do not have Photoshop. Any other way to ensure it prints out to correct size?

You can also do it in MS Publisher, I just tested it. I made a grid 0.254mm (= 0.1") and scaled the pad spacings to that. Worked a treat.

Govmnt_Lacky

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #177 on: August 26, 2010, 10:29:19 AM »

Scale the PnP to a .1 inch grid in photoshop. An ICs pin spacing will match the grid when correctly sized. Is that what you mean?


I do not have Photoshop. Any other way to ensure it prints out to correct size?

You can also do it in MS Publisher, I just tested it. I made a grid 0.254mm (= 0.1") and scaled the pad spacings to that. Worked a treat.

I also do not have MS Publisher. As you can tell from my login, I work for the government. They do not give us cool software tools like MS Publisher. Any other ideas? Sorry to be a pain. Can anyone tell me a % to shrink this down to in order to get the sizes correct?
Any other ideas would be appreciated.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of ‘up to and including my life.’

Govmnt_Lacky

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #178 on: August 26, 2010, 10:35:39 AM »

You can also do it in MS Publisher, I just tested it. I made a grid 0.254mm (= 0.1") and scaled the pad spacings to that. Worked a treat.

Sorry about my first reply.... Here goes again...

I also do not have MS Publisher. As you can tell from my login, I work for the government. They do not give us cool software tools like MS Publisher. Any other ideas? Sorry to be a pain. Can anyone tell me a % to shrink this down to in order to get the sizes correct?
Any other ideas would be appreciated.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of ‘up to and including my life.’

radio

Re: "Little Angel" - Super Simple PT2399 Mini Chorus
« Reply #179 on: August 26, 2010, 11:04:18 AM »
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

Keep on soldering!
And don t burn fingers!